Journal of Microbiology

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Genome-based classification of Paraniabella aurantiaca gen. nov., sp. nov., isolated from soil and taxonomic reclassification of five species within the genus Niabella: Yong-Seok Kim, Yerang Yang, Miryung Kim, Do-Hoon Lee, Chang-Jun Cha; J. Microbiol. 2025;63(10):e2505005. Published online October 31, 2025; DOI: https://doi.org/10.71150/jm.2505005

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Abstract PDF Supplementary Material: A Gram-stain-negative, aerobic, non-motile, rod-shaped, and orange-pigmented bacterium, designated CJ426^T, was isolated from ginseng soil in Anseong, Korea. Strain CJ426^T grew optimally on Reasoner’s 2A agar at 30°C and pH 7.0 in the absence of NaCl. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain CJ426^T belonged to the family Chitinophagaceae and had the highest sequence similarity with Niabella hibiscisoli KACC 18857^T (98.7%). The 16S rRNA gene sequence similarities with other members of the genus Niabella ranged from 92.3% to 98.1%. Phylogenomic analyses and overall genomic relatedness indices, including average nucleotide identity, average amino acid identity, and the percentage of conserved proteins values, supported the classification of strain CJ426^T as a representative of a novel genus within the family Chitinophagaceae. Furthermore, genome-based analyses suggested that five members of the genus Niabella, including N. aquatica, N. defluvii, N. ginsengisoli, N. hibiscisoli, and, N. yanshanensis, should be separated from other Niabella species and be assigned as a novel genus. The major isoprenoid quinone of strain CJ426^T was menaquinone-7 (MK-7). The predominant polar lipids were phosphatidylethanolamine and six unidentified aminolipids. The major fatty acids were iso-C_15:0, iso-C_15:1 G, and iso-C_17:0 3-OH. The genome of strain CJ426^T was 6.3 Mbp in size, consisting of three contigs, with a G + C content of 41.9%. Based on a polyphasic taxonomic approach, strain CJ426^T represents a novel genus and species within the family Chitinophagaceae, for which the name Paraniabella aurantiaca gen. nov., sp. nov. is proposed. The type strain is CJ426^T (= KACC 23908^T = JCM 37728^T).

Metal ion homeostasis regulates condensin-dependent chromatin architecture and chromosome segregation in Schizosaccharomyces pombe: Seong Ho An, Kyoung-Dong Kim; J. Microbiol. 2025;63(9):e2505008. Published online August 29, 2025; DOI: https://doi.org/10.71150/jm.2505008

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Abstract PDF Supplementary Material: Condensin plays a central role in mitotic chromosome organization and segregation by mediating long-range chromatin interactions. However, the extent to which cellular metabolic status influences condensin function remains unclear. To gain insights into the relationship of metal ion homeostasis and the function of condensin, we conducted genome-wide chromatin immunoprecipitation sequencing (ChIP-seq) using Schizosaccharomyces pombe under iron- or zinc-deficient conditions. Under iron- or zinc-deficient conditions, ChIP-seq results revealed a selective reduction in condensin binding at high-affinity target loci, particularly genes regulated by Ace2 and Ams2, while cohesin binding remained largely unaffected. Hi-C analysis showed that iron depletion weakened chromatin interactions at these condensin targets and centromeres, without disrupting global genome architecture. DNA fluorescence in situ hybridization (FISH) confirmed that iron deficiency impaired long-range associations between centromeres and Ace2 target loci at the single-cell level. Notably, iron deficiency led to chromosome segregation defects during mitosis, suggesting that diminished condensin occupancy compromised genome stability. These changes occurred without significant alterations in condensin protein levels or global transcription, indicating a direct effect of metal ion availability on condensin activity. Collectively, our findings revealed a previously unrecognized regulatory axis in which cellular metal ion homeostasis modulated condensin-dependent chromatin organization and mitotic chromosome segregation, offering new insights into the integration of metabolic state with genome maintenance.

Efficient CRISPR-based genome editing for inducible degron systems to enable temporal control of protein function in large double-stranded DNA virus genomes: Kihye Shin, Eui Tae Kim; J. Microbiol. 2025;63(9):e2504008. Published online August 29, 2025; DOI: https://doi.org/10.71150/jm.2504008

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Abstract PDF: CRISPR-Cas9-based gene editing enables precise genetic modifications. However, its application to human cytomegalovirus (HCMV) remains challenging due to the large size of the viral genome and the essential roles of key regulatory genes. Here, we establish an optimized CRISPR-Cas9 system for precise labeling and functional analysis of HCMV immediate early (IE) genes. By integrating a multifunctional cassette encoding an auxin-inducible degron (AID), a self-cleaving peptide (P2A), and GFP into the viral genome via homology-directed repair (HDR), we achieved efficient knock-ins without reliance on bacterial artificial chromosome (BAC) cloning, a labor-intensive and time-consuming approach. We optimized delivery strategies, donor template designs, and component ratios to enhance HDR efficiency, significantly improving knock-in success rates. This system enables real-time fluorescent tracking and inducible protein degradation, allowing temporal control of essential viral proteins through auxin-mediated depletion. Our approach provides a powerful tool for dissecting the dynamic roles of viral proteins throughout the HCMV life cycle, facilitating a deeper understanding of viral pathogenesis and potential therapeutic targets.

Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., isolated from Korean coastal surface seawater: Jisoo Han, Yeonjung Lim, Mirae Kim, Jang-Cheon Cho; J. Microbiol. 2025;63(8):e2504017. Published online August 13, 2025; DOI: https://doi.org/10.71150/jm.2504017

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Abstract PDF Supplementary Material: Two Gram-stain-negative, obligately aerobic, non-motile, short rod-shaped bacteria, designated IMCC43871^T and IMCC45206^T, were isolated from coastal surface seawater collected from the Yellow Sea and the South Sea of Korea, respectively. The two strains shared 99.2% 16S rRNA gene sequence similarity with each other and exhibited ≤ 98.4% similarity to three described Rubrivirga species. Average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between IMCC43871^T and IMCC45206^T were 88.5% and 36.3%, respectively, confirming that they represent two distinct species. Their ANI (≤ 77.7%) and dDDH (≤ 21.4%) values relative to the type strains of the genus Rubrivirga further supported the recognition of strains IMCC43871^T and IMCC45206^T as two novel species within the genus. The complete genomes of IMCC43871^T (4.17 Mb, 71.8% G + C content) and IMCC45206^T (4.17 Mb, 72.8% G + C content) fall within the known genomic range of the genus. Cellular fatty acid, quinone, and polar lipid profiles were consistent with the chemotaxonomic features of the genus Rubrivirga, supporting their affiliation with the genus. Based on phylogenetic, genomic, and phenotypic evidence, strains IMCC43871^T and IMCC45206^T are proposed as two novel species, Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., respectively. The type strains are IMCC43871^T (= KCTC 102072^T = NBRC 116463^T) and IMCC45206^T (= KCTC 92925^T = NBRC 116172^T = CCTCC AB 2023136^T).

Protocol

A guide to genome mining and genetic manipulation of biosynthetic gene clusters in Streptomyces: Heonjun Jeong, YeonU Choe, Jiyoon Nam, Yeon Hee Ban; J. Microbiol. 2025;63(4):e2409026. Published online April 29, 2025; DOI: https://doi.org/10.71150/jm.2409026

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Abstract PDF

Streptomyces are a crucial source of bioactive secondary metabolites with significant clinical applications. Recent studies of bacterial and metagenome-assembled genomes have revealed that Streptomyces harbors a substantial number of uncharacterized silent secondary metabolite biosynthetic gene clusters (BGCs). These BGCs represent a vast diversity of biosynthetic pathways for natural product synthesis, indicating significant untapped potential for discovering new metabolites. To exploit this potential, genome mining using comprehensive strategies that leverage extensive genomic databases can be conducted. By linking BGCs to their encoded products and integrating genetic manipulation techniques, researchers can greatly enhance the identification of new secondary metabolites with therapeutic relevance. In this context, we present a step-by-step guide for using the antiSMASH pipeline to identify secondary metabolite-coding BGCs within the complete genome of a novel Streptomyces strain. This protocol also outlines gene manipulation methods that can be applied to Streptomyces to activate cryptic clusters of interest and validate the functions of biosynthetic genes. By following these guidelines, researchers can pave the way for discovering and characterizing valuable natural products.

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A review of geomicrobial bioprospecting strategies for novel therapeutic discovery from Earth’s extreme environments
Trideep Saikia, Sandipan Das
Discover Geoscience.2025;[Epub] CrossRef

Review

Progress and challenges in CRISPR/Cas applications in microalgae: Quynh-Giao Tran, Trang Thi Le, Dong-Yun Choi, Dae-Hyun Cho, Jin-Ho Yun, Hong Il Choi, Hee-Sik Kim, Yong Jae Lee; J. Microbiol. 2025;63(3):e2501028. Published online March 28, 2025; DOI: https://doi.org/10.71150/jm.2501028

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Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) technologies have emerged as powerful tools for precise genome editing, leading to a revolution in genetic research and biotechnology across diverse organisms including microalgae. Since the 1950s, microalgal production has evolved from initial cultivation under controlled conditions to advanced metabolic engineering to meet industrial demands. However, effective genetic modification in microalgae has faced significant challenges, including issues with transformation efficiency, limited target selection, and genetic differences between species, as interspecies genetic variation limits the use of genetic tools from one species to another. This review summarized recent advancements in CRISPR systems applied to microalgae, with a focus on improving gene editing precision and efficiency, while addressing organism-specific challenges. We also discuss notable successes in utilizing the class 2 CRISPR-associated (Cas) proteins, including Cas9 and Cas12a, as well as emerging CRISPR-based approaches tailored to overcome microalgal cellular barriers. Additionally, we propose future perspectives for utilizing CRISPR/Cas strategies in microalgal biotechnology.

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Active and targeted micro/nanoplastics remediation via engineered microalgae co-displaying polymer-binding peptides and plastic-degrading enzymes: A critical review and perspectives
Ling Wang, Mingjing Zhang, Jialin Wang, Chen Hu, Zhanyou Chi, Lei Li, Wenjun Luo, Chengze Li, Chenba Zhu
Algal Research.2026; 93: 104455. CrossRef
Advancing microbial engineering through synthetic biology
Ki Jun Jeong
Journal of Microbiology.2025; 63(3): e2503100. CrossRef
Progress and prospects in metabolic engineering approaches for isoprenoid biosynthesis in microalgae
Sonia Mohamadnia, Borja Valverde-Pérez, Omid Tavakoli, Irini Angelidaki
Biotechnology for Biofuels and Bioproducts.2025;[Epub] CrossRef
Beyond Biomass: Reimagining Microalgae as Living Environmental Nano-Factories
Thinesh Selvaratnam, Shaseevarajan Sivanantharajah, Kirusha Sriram
Environments.2025; 12(7): 221. CrossRef
Harnessing MicroRNAs and CRISPR to enhance biofuel production in microalgae
Dariga K. Kirbayeva, Altynay Y. Shayakhmetova, Bekzhan D. Kossalbayev, Assemgul K. Sadvakasova, Meruyert O. Bauenova
International Journal of Hydrogen Energy.2025; 157: 150399. CrossRef
Beyond Cutting: CRISPR-Driven Synthetic Biology Toolkit for Next-Generation Microalgal Metabolic Engineering
Limin Yang, Qian Lu
International Journal of Molecular Sciences.2025; 26(15): 7470. CrossRef
Mechanistic Role of Heavy Metals in Driving Antimicrobial Resistance: From Rhizosphere to Phyllosphere
Rahul Kumar, Tanja P. Vasić, Sanja P. Živković, Periyasamy Panneerselvam, Gustavo Santoyo, Sergio de los Santos Villalobos, Adeyemi Nurudeen Olatunbosun, Aditi Pandit, Leonard Koolman, Debasis Mitra, Pankaj Gautam
Applied Microbiology.2025; 5(3): 79. CrossRef
Strain Improvement Through Genetic Engineering and Synthetic Biology for the Creation of Microalgae with Enhanced Lipid Accumulation, Stress Tolerance, and Production of High-value
Alebachew Molla, Gedif Meseret
Science Frontiers.2025; 6(3): 80. CrossRef
The Role of Molecular Tools in Microalgal Strain Improvement: Current Status and Future Perspectives
Alebachew Molla, Gedif Meseret
Advances in Bioscience and Bioengineering.2025; 13(3): 51. CrossRef
CRISPR-Cas9 genome editing in microalgae for improved high-value products (HVP) production
Fazleen Haslinda Mohd Hatta, Nurin Nisa’ Ahmad Zamri, Norazlina Ahmad
Asia Pacific Journal of Molecular Biology and Biotechnology.2025; : 245. CrossRef
Advances in Algae-Based Bioplastics: From Strain Engineering and Fermentation to Commercialization and Sustainability
Nilay Kumar Sarker, Prasad Kaparaju
Fermentation.2025; 11(10): 574. CrossRef
Exploring the nutritional and bioactive potential of microalgal sulfated polysaccharides for functional food applications
Fajar Sofyantoro, Eka Sunarwidhi Prasedya, Fahrul Nurkolis, Andri Frediansyah
Food Science and Biotechnology.2025;[Epub] CrossRef

Research Article

Virgibacillus saliphilus sp. nov. and Virgibacillus salidurans sp. nov., isolated from kimchi: Young Joon Oh, Joon Yong Kim, Min-Sung Kwon, Sulhee Lee, Sang-Pil Choi, Hak-Jong Choi; J. Microbiol. 2025;63(1):e.2501001. Published online January 24, 2025; DOI: https://doi.org/10.71150/jm.2501001

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Abstract PDF Supplementary Material

This study aimed to provide a taxonomic description of two bacterial strains, NKC19-3^T and NKC19-16^T, isolated from commercially produced kimchi obtained from various regions within the Republic of Korea. Both strains were rod-shaped, gram-stain-positive, facultatively anaerobic, and displayed positive reactions for oxidase and catalase. Additionally, these bacteria were motile, halophilic (salt-tolerant), and proliferated under alkaline conditions. Genetically, both strains showed 98.0% similarity in their 16S rRNA gene sequences and were most closely related to Virgibacillus natechei FarD^T, with 96.5 and 96.8% sequence similarity, respectively. ANI values indicated that the two novel strains were distinct from V. natechei FarD^T, as they were below the species demarcation threshold. The ANI value between strains NKC19-3ᵀ and NKC19-16ᵀ was 84.64–84.75%, and the values between these strains and other related strains did not exceed 80.0%, further supporting their classification as novel species. Phylogenetic analysis revealed that strains NKC19-3^T and NKC19-16^T formed a distinct branch within the genus Virgibacillus, clearly distinguishing them from other species in the same genus. Regarding genomic characteristics, the GC content was 38.9% for strain NKC19-3^T and 39.5% for strain NKC19-16^T. The genome of strain NKC19-3^T had a size of approximately 4.1 Mb and contained 3,785 protein-coding genes (CDSs). Strain NKC19-16^T had a slightly smaller genome, approximately 3.9 Mb in size and harbored 3,726 CDSs. The polar lipid profiles of strains NKC19-3ᵀ and NKC19-16ᵀ included diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), glycolipids (GL), and an unidentified lipid (L). The predominant fatty acids of both strains were anteiso-C_15:0 and anteiso-C_17:0. Considering the comprehensive analysis encompassing phenotypic, genomic, phylogenetic, and chemotaxonomic data, strains NKC19-3^T and NKC19-16^T are proposed to represent two novel species within the genus Virgibacillus. The suggested names for these species are Virgibacillus saliphilus sp. nov. (type strain NKC19-3^T, also referred to as KACC 22326^T and DSM 112707^T) and Virgibacillus salidurans sp. nov. (type strain NKC19-16^T, also referred to as KACC 22327^T and DSM 112708^T).

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Validation List no. 223. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef

Minireview

Advances in functional analysis of the microbiome: Integrating metabolic modeling, metabolite prediction, and pathway inference with Next-Generation Sequencing data: Sungwon Jung; J. Microbiol. 2025;63(1):e.2411006. Published online January 24, 2025; DOI: https://doi.org/10.71150/jm.2411006

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This review explores current advancements in microbiome functional analysis enabled by next-generation sequencing technologies, which have transformed our understanding of microbial communities from mere taxonomic composition to their functional potential. We examine approaches that move beyond species identification to characterize microbial activities, interactions, and their roles in host health and disease. Genome-scale metabolic models allow for in-depth simulations of metabolic networks, enabling researchers to predict microbial metabolism, growth, and interspecies interactions in diverse environments. Additionally, computational methods for predicting metabolite profiles offer indirect insights into microbial metabolic outputs, which is crucial for identifying biomarkers and potential therapeutic targets. Functional pathway analysis tools further reveal microbial contributions to metabolic pathways, highlighting alterations in response to environmental changes and disease states. Together, these methods offer a powerful framework for understanding the complex metabolic interactions within microbial communities and their impact on host physiology. While significant progress has been made, challenges remain in the accuracy of predictive models and the completeness of reference databases, which limit the applicability of these methods in under-characterized ecosystems. The integration of these computational tools with multi-omic data holds promise for personalized approaches in precision medicine, allowing for targeted interventions that modulate the microbiome to improve health outcomes. This review highlights recent advances in microbiome functional analysis, providing a roadmap for future research and translational applications in human health and environmental microbiology.

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Microbiota, chronic inflammation, and health: The promise of inflammatome and inflammatomics for precision medicine and health care
Huan Zhang, Bing Jun Yang Lee, Tong Wang, Xuesong Xiang, Yafang Tan, Yanping Han, Yujing Bi, Fachao Zhi, Xin Wang, Fang He, Seppo J. Salminen, Baoli Zhu, Ruifu Yang
hLife.2025; 3(7): 307. CrossRef
Study on the Rhizosphere Soil Microbial Diversity of Five Common Orchidaceae Species in the Transitional Zone Between Warm Temperate and Subtropical Regions
Jingjing Du, Shengqian Guo, Xiaohang Li, Zhonghu Geng, Zhiliang Yuan, Xiqiang Song
Diversity.2025; 17(9): 605. CrossRef
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Cherelle Atallah, Ayline El Abiad, Marita El Abiad, Mantoura Nakad, Jean Claude Assaf
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Computational Metagenomics: State of the Art
Marco Antonio Pita-Galeana, Martin Ruhle, Lucía López-Vázquez, Guillermo de Anda-Jáuregui, Enrique Hernández-Lemus
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BMC Plant Biology.2025;[Epub] CrossRef

Research Article

PneusPage: A WEB-BASED TOOL for the analysis of Whole-Genome Sequencing Data of Streptococcus pneumonia: Eunju Hong, Youngjin Shin, Hyunseong Kim, Woo Young Cho, Woo-Hyun Song, Seung-Hyun Jung, Minho Lee; J. Microbiol. 2025;63(1):e.2409020. Published online January 24, 2025; DOI: https://doi.org/10.71150/jm.2409020

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Abstract PDF Supplementary Material

With the advent of whole-genome sequencing, opportunities to investigate the population structure, transmission patterns, antimicrobial resistance profiles, and virulence determinants of Streptococcus pneumoniae at high resolution have been increasingly expanding. Consequently, a user-friendly bioinformatics tool is needed to automate the analysis of Streptococcus pneumoniae whole-genome sequencing data, summarize clinically relevant genomic features, and further guide treatment options. Here, we developed PneusPage, a web-based tool that integrates functions for species prediction, molecular typing, drug resistance determination, and data visualization of Streptococcus pneumoniae. To evaluate the performance of PneusPage, we analyzed 80 pneumococcal genomes with different serotypes from the Global Pneumococcal Sequencing Project and compared the results with those from another platform, PathogenWatch. We observed a high concordance between the two platforms in terms of serotypes (100% concordance rate), multilocus sequence typing (100% concordance rate), penicillin-binding protein typing (88.8% concordance rate), and the Global Pneumococcal Sequencing Clusters (98.8% concordance rate). In addition, PneusPage offers integrated analysis functions for the detection of virulence and mobile genetic elements that are not provided by previous platforms. By automating the analysis pipeline, PneusPage makes whole-genome sequencing data more accessible to non-specialist users, including microbiologists, epidemiologists, and clinicians, thereby enhancing the utility of whole-genome sequencing in both research and clinical settings. PneusPage is available at https://pneuspage.minholee.net/.

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Genomic analysis and pneumococcal population dynamics across PCV implementation in South Korea, 1997–2023
Jeong-Ih Shin, Sung-Yeon Cho, Jiyon Chu, Chulmin Park, Minho Lee, Joon Young Song, Seung-Hyun Jung, Dong-Gun Lee
Microbial Genomics .2025;[Epub] CrossRef
GPS Pipeline: portable, scalable genomic pipeline for Streptococcus pneumoniae surveillance from Global Pneumococcal Sequencing Project
Harry C. H. Hung, Narender Kumar, Victoria Dyster, Corin Yeats, Benjamin Metcalf, Yuan Li, Paulina A. Hawkins, Lesley McGee, Stephen D. Bentley, Stephanie W. Lo
Nature Communications.2025;[Epub] CrossRef

Journal Articles

Thalassotalea aquiviva sp. nov., and Thalassotalea maritima sp. nov., Isolated from Seawater of the Coast in South Korea: Jina Lee, Seung-Hui Song, Kira Moon, Nakyeong Lee, Sangdon Ryu, Hye Seon Song, Sung Moon Lee, Yun Ji Kim, Se Won Chun, Kyung-Min Choi, Aslan Hwanhwi Lee; J. Microbiol. 2024;62(12):1099-1111. Published online December 10, 2024; DOI: https://doi.org/10.1007/s12275-024-00191-4

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Two novel bacterial strains, 273M-4^T and Sam97^T, were isolated from seawater in the Yellow Sea, Muan-gun, South Korea, and identified as members of the genus Thalassotalea. Both strains were Gram-stain-negative, aerobic, rod-shaped, non-motile, non-flagellated, and oxidase- and catalase-positive. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains 273M-4^T and Sam97^T were most closely related to Thalassotalea ponticola KCTC 42155^T, with sequence similarities of 97.5% and 98.3%, respectively. Optimal growth for strain 273M-4^T occurred at 25-30 °C, pH 7.0, and 2% NaCl, while strain Sam97^T grew optimally at 30 °C, pH 8.0, and 2% NaCl. Genome sizes of strains 273M-4^T and Sam97^T were 3.37 and 3.31 Mb, with DNA G + C contents of 41.0 mol% and 42.9 mol%, respectively. The orthologous average nucleotide identity (OrthoANI) and digital DNA-DNA hybridization (dDDH) values between the two strains were 71.6% and 24.4%, respectively, indicating that they are distinct species. Further genomic analyses of these two strains revealed OrthoANI values of < 73.5% and dDDH values of < 26.7% within the genus Thalassotalea, suggesting their distinctiveness from other Thalassotalea species. The predominate fatty acids of strains 273M-4^T and Sam97^T were summed feature 3 (consisting of C_16:1 ω7c/C_16:1 ω6c) and C_16:0. All strains contained phosphatidylethanolamine and phosphatidylglycerol as the major polar lipids and ubiquinone-8 (Q-8) as the primary respiratory quinone. Based on phenotypic, phylogenetic, genotypic, and chemotaxonomic data, strains 273M-4^T (= KCTC 8644^T = LMG 33695^T) and Sam97^T (= KCTC 8645^T = LMG 33694^T) represent novel species of the genus Thalassotalea, named Thalassotalea aquiviva sp. nov. and Thalassotalea maritima sp. nov..

Citations

Citations to this article as recorded by

Validation List no. 223. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., isolated from Korean coastal surface seawater
Jisoo Han, Yeonjung Lim, Mirae Kim, Jang-Cheon Cho
Journal of Microbiology.2025; 63(8): e2504017. CrossRef

Characterization and Comparative Genomic Analysis of vB_BceM_CEP1: A Novel Temperate Bacteriophage Infecting Burkholderia cepacia Complex: Momen Askoura, Eslam K Fahmy, Safya E Esmaeel, Wael A H Hegazy, Aliaa Abdelghafar; J. Microbiol. 2024;62(11):1035-1055. Published online November 18, 2024; DOI: https://doi.org/10.1007/s12275-024-00185-2

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Abstract PDF

The increasing prevalence of multidrug-resistant bacteria imminently threatens public health and jeopardizes nearly all aspects of modern medicine. The Burkholderia cepacia complex (Bcc) comprises Burkholderia cepacia and the related species of Gram-negative bacteria. Members of the Bcc group are opportunistic pathogens responsible for various chronic illnesses, including cystic fibrosis and chronic granulomatous disease. Phage therapy is emerging as a potential solution to combat the antimicrobial resistance crisis. In this study, a temperate phage vB_BceM_CEP1 was isolated from sewage and fully characterized. Transmission electron microscopy indicated that vB_BceM_CEP1 belongs to the family Peduoviridae. The isolated phage demonstrated enhanced environmental stability and antibiofilm potential. One-step growth analysis revealed a latent period of 30 min and an average burst size of 139 plaque-forming units per cell. The genome of vB_BceM_CEP1 consists of 32,486 bp with a GC content of 62.05%. A total of 40 open reading frames were annotated in the phage genome, and none of the predicted genes was annotated as tRNA. Notably, genes associated with antibiotic resistance, host virulence factors, and toxins were absent from the vB_BceM_CEP1 genome. Based on its unique phenotype and phylogeny, the isolated phage vB_BceM_CEP1 is classified as a new temperate phage with lytic activity. The findings of this study enhance our understanding of the diversity of Bcc phages.

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Bacteriophage therapy to combat MDR non-fermenting Gram-negative bacteria causing nosocomial infections: recent progress and challenges
Sunil Kumar, Razique Anwer, Anil Sharma, Mukesh Yadav, Nirmala Sehrawat
Naunyn-Schmiedeberg's Archives of Pharmacology.2025; 398(11): 15037. CrossRef

Whole-Genome Sequencing Reveals the Population Structure and Genetic Diversity of Salmonella Typhimurium ST34 and ST19 Lineages: Zhen-Xu Zhuo, Yu-Lian Feng, Xi-Wei Zhang, Hao Liu, Fang-Yin Zeng, Xiao-Yan Li; J. Microbiol. 2024;62(10):859-870. Published online November 4, 2024; DOI: https://doi.org/10.1007/s12275-024-00170-9

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Salmonella Typhimurium is an invasive gastrointestinal pathogen for both humans and animals. To investigate the genetic framework and diversity of S. Typhimurium, a total of 194 S. Typhimurium isolates were collected from patients in a tertiary hospital between 2020 and 2021. Antimicrobial susceptibility testing was used to confirm the resistance phenotype. Whole-genome sequencing and bioinformatics analysis were performed to determine the sequence type, phylogenetic relationships, resistance gene profiles, Salmonella pathogenicity island (SPI) and the diversity of the core and pan genome. The result showed that 57.22% of S. Typhimurium isolates were multidrug resistant and resistance of total isolates to the first-line drug ciprofloxacin was identified in 60.82%. The population structure of S. Typhimurium was categorized into three lineages: ST19 (20.10%, 39/194), ST34-1 (47.42%, 92/194) and ST34-2 (40.65%, 63/194), with the population size exhibiting increasing trends. All lineages harbored variety of fimbrial operons, prophages, SPIs and effectors that contributed to the virulence and long-term infections of S. Typhimurium. Importantly, ST34-1 lineage might potentially be more invasive due to the possession of SPI1-effector gene sopE which was essential for the proliferation, internalization and intracellular presence of S. Typhimurium in hosts. Multiple antimicrobial resistance genes were characteristically distributed across three lineages, especially carbapenem genes only detected in ST34-1&2 lineages. The distinct functional categories of pan genome among three lineages were observed in metabolism, signaling and gene information processing. This study provides a theoretical foundation for the evolved adaptation and genetic diversity of S. Typhimurium ST19 and ST34, among which ST34 lineages with multidrug resistance and potential hypervirulence need to pay more attention to epidemiological surveillance.

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Genomic Evidence for the Rise of Salmonella Typhimurium ST34 with Increased Plasmid-Mediated Resistance in the Thailand Pork Chain
Hongmei Liu, Ning Wang, Sunpetch Angkititrakul, Wengui Li, Zhongyang Luo, Mingpeng Hou, Yi Wu, Yubo Shi, Yuelin Wang, Fengyun Li, Yaowen Liu, Xin Wu, Fanan Suksawat
Pathogens.2025; 14(12): 1190. CrossRef

Review

Extensive Genomic Rearrangement of Catalase-Less Cyanobloom-Forming Microcystis aeruginosa in Freshwater Ecosystems: Minkyung Kim, Jaejoon Jung, Wonjae Kim, Yerim Park, Che Ok Jeon, Woojun Park; J. Microbiol. 2024;62(11):933-950. Published online October 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00172-7

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Many of the world's freshwater ecosystems suffer from cyanobacteria-mediated blooms and their toxins. However, a mechanistic understanding of why and how Microcystis aeruginosa dominates over other freshwater cyanobacteria during warmer summers is lacking. This paper utilizes comparative genomics with other cyanobacteria and literature reviews to predict the gene functions and genomic architectures of M. aeruginosa based on complete genomes. The primary aim is to understand this species' survival and competitive strategies in warmer freshwater environments. M. aeruginosa strains exhibiting a high proportion of insertion sequences (~ 11%) possess genomic structures with low synteny across different strains. This indicates the occurrence of extensive genomic rearrangements and the presence of many possible diverse genotypes that result in greater population heterogeneities than those in other cyanobacteria in order to increase survivability during rapidly changing and threatening environmental challenges. Catalase-less M. aeruginosa strains are even vulnerable to low light intensity in freshwater environments with strong ultraviolet radiation. However, they can continuously grow with the help of various defense genes (e.g., egtBD, cruA, and mysABCD) and associated bacteria. The strong defense strategies against biological threats (e.g., antagonistic bacteria, protozoa, and cyanophages) are attributed to dense exopolysaccharide (EPS)-mediated aggregate formation with efficient buoyancy and the secondary metabolites of M. aeruginosa cells. Our review with extensive genome analysis suggests that the ecological vulnerability of M. aeruginosa cells can be overcome by diverse genotypes, secondary defense metabolites, reinforced EPS, and associated bacteria.

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Cyanophage Infections in a Sponge Intracellular Cyanobacterial Symbiont
Tzipora Peretz, Esther Cattan‐Tsaushu, Chiara Conti, Benyamin Rosental, Laura Steindler, Sarit Avrani
Environmental Microbiology.2025;[Epub] CrossRef
Public goods-mediated bacterial interplay in aquatic ecosystems
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Delineating the Acquired Genetic Diversity and Multidrug Resistance in Alcaligenes from Poultry Farms and Nearby Soil: Abhilash Bhattacharjee, Anil Kumar Singh; J. Microbiol. 2024;62(7):511-523. Published online June 21, 2024; DOI: https://doi.org/10.1007/s12275-024-00129-w

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Alcaligenes faecalis is one of the most important and clinically significant environmental pathogens, increasing in importance due to its isolation from soil and nosocomial environments. The Gram-negative soil bacterium is associated with skin endocarditis, bacteremia, dysentery, meningitis, endophthalmitis, urinary tract infections, and pneumonia in patients. With emerging antibiotic resistance in A. faecalis, it has become crucial to understand the origin of such resistance genes within this clinically significant environmental and gut bacterium. In this research, we studied the impact of antibiotic overuse in poultry and its effect on developing resistance in A. faecalis. We sampled soil and faecal materials from five poultry farms, performed whole genome sequencing & analysis and identified four strains of A. faecalis. Furthermore, we characterized the genes in the genomic islands of A. faecalis isolates. We found four multidrug-resistant A. faecalis strains that showed resistance against vancomycin (MIC >1000 μg/ml), ceftazidime (50 μg/ml), colistin (50 μg/ml) and ciprofloxacin (50 μg/ml). From whole genome comparative analysis, we found more than 180 resistance genes compared to the reference sequence. Parts of our assembled contigs were found to be similar to different bacteria which included pbp1A and pbp2 imparting resistance to amoxicillin originally a part of Helicobacter and Bordetella pertussis. We also found the Mycobacterial insertion element IS6110 in the genomic islands of all four genomes. This prominent insertion element can be transferred and induce resistance to other bacterial genomes. The results thus are crucial in understanding the transfer of resistance genes in the environment and can help in developing regimes for antibiotic use in the food and poultry industry.

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First Case of Respiratory Infection in Rabbits Caused by Alcaligenes faecalis in Romania
Vlad Iorgoni, Ionica Iancu, Ionela Popa, Alexandru Gligor, Gabriel Orghici, Bogdan Sicoe, Corina Badea, Cristian Dreghiciu, Călin Pop, Timea Bochiș, Janos Degi, Luminita Costinar, Corina Pascu, Viorel Herman
Veterinary Sciences.2025; 12(1): 33. CrossRef

Review

Genomic Evolution and Recombination Dynamics of Human Adenovirus D Species: Insights from Comprehensive Bioinformatic Analysis: Anyeseu Park, Chanhee Lee, Jeong Yoon Lee; J. Microbiol. 2024;62(5):393-407. Published online March 7, 2024; DOI: https://doi.org/10.1007/s12275-024-00112-5

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Human adenoviruses (HAdVs) can infect various epithelial mucosal cells, ultimately causing different symptoms in infected organ systems. With more than 110 types classified into seven species (A-G), HAdV-D species possess the highest number of viruses and are the fastest proliferating. The emergence of new adenovirus types and increased diversity are driven by homologous recombination (HR) between viral genes, primarily in structural elements such as the penton base, hexon and fiber proteins, and the E1 and E3 regions. A comprehensive analysis of the HAdV genome provides valuable insights into the evolution of human adenoviruses and identifies genes that display high variation across the entire genome to determine recombination patterns. Hypervariable regions within genetic sequences correlate with functional characteristics, thus allowing for adaptation to new environments and hosts. Proteotyping of newly emerging and already established adenoviruses allows for prediction of the characteristics of novel viruses. HAdV-D species evolved in a direction that increased diversity through gene recombination. Bioinformatics analysis across the genome, particularly in highly variable regions, allows for the verification or re-evaluation of recombination patterns in both newly introduced and pre-existing viruses, ultimately aiding in tracing various biological traits such as virus tropism and pathogenesis. Our research does not only assist in predicting the emergence of new adenoviruses but also offers critical guidance in regard to identifying potential regulatory factors of homologous recombination hotspots.

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Relationship between adenovirus infection and intussusception via pathological evidence confirms
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miR-135b Aggravates Fusobacterium nucleatum-Induced Cisplatin Resistance in Colorectal Cancer by Targeting KLF13: Wei Zeng , Jia Pan , Guannan Ye; J. Microbiol. 2024;62(2):63-73. Published online February 24, 2024; DOI: https://doi.org/10.1007/s12275-023-00100-1

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Cisplatin resistance is the main cause of colorectal cancer (CRC) treatment failure, and the cause has been reported to be related to Fusobacterium nucleatum (Fn) infection. In this study, we explored the role of Fn in regulating cisplatin resistance of CRC cells and its underlying mechanism involved. The mRNA and protein expressions were examined by qRT-PCR and western blot. Cell proliferation and cell apoptosis were assessed using CCK8 and flow cytometry assays, respectively. Dual-luciferase reporter gene assay was adopted to analyze the molecular interactions. Herein, our results revealed that Fn abundance and miR-135b expression were markedly elevated in CRC tissues, with a favorable association between the two. Moreover, Fn infection could increase miR-135b expression via a concentration-dependent manner, and it also enhanced cell proliferation but reduced apoptosis and cisplatin sensitivity by upregulating miR-135b. Moreover, KLF13 was proved as a downstream target of miR-135b, of which overexpression greatly diminished the promoting effect of miR-135b or Fn-mediated cisplatin resistance in CRC cells. In addition, it was observed that upstream 2.5 kb fragment of miR-135b promoter could be interacted by β-catenin/TCF4 complex, which was proved as an effector signaling of Fn. LF3, a blocker of β-catenin/TCF4 complex, was confirmed to diminish the promoting role of Fn on miR-135b expression. Thus, it could be concluded that Fn activated miR-135b expression through TCF4/β-catenin complex, thereby inhibiting KLF13 expression and promoting cisplatin resistance in CRC.

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Prevalence of Indigenous Antibiotic‑Resistant Salmonella Isolates and Their Application to Explore a Lytic Phage vB_SalS_KFSSM with an Intra‑Broad Specificity: Jaein Choe , Su-Hyeon Kim , Ji Min Han , Jong-Hoon Kim , Mi-Sun Kwak , Do-Won Jeong , Mi-Kyung Park; J. Microbiol. 2023;61(12):1063-1073. Published online January 2, 2024; DOI: https://doi.org/10.1007/s12275-023-00098-6

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The consumption of fresh produce has led to increase in antibiotic-resistant (AR) Salmonella outbreaks. In this study, indigenous Salmonella was isolated from a total of two hundred-two samples including fresh produce and agricultural environmental samples in Korea. After biochemical confirmation using the Indole, Methyl Red, Voges-Proskauer, Citrate tests, presumable Salmonella isolates were identified by 16S rRNA sequencing. Identified Salmonella isolates were evaluated for antibiotic susceptibility against twenty-two antibiotics. The specificity and the efficiency of plating (EOP) of vB_SalS_KFSSM were evaluated against fifty-three bacterial strains. Twenty-five suspected Salmonella were isolated and confirmed by the positive
result
for methyl red and citrate, of which ten were identified as Salmonella spp. through 16S rRNA gene sequencing. Eight Salmonella isolates (4.0%, n = 8/202) were resistant to at least one antibiotic, among which five were multi-drug resistant. As a lytic phage against Salmonella spp. CMGS-1, vB_SalS_KFSSM was isolated from cow manure. The phage was observed as a tailed phage belonging to the class Caudoviricetes. It exhibited an intra-broad specificity against four indigenous AR Salmonella isolates, two indigenous Salmonella isolates, and five other Salmonella serotypes with great efficiencies (EOP ≥ 0.75). Thus, this study suggested the potential of vB_SalS_KFSSM to combat indigenous AR Salmonella.

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Functional and Genomic Features of a Lytic Salmonella Phage vB_StyS_KFSST1 for Development as New Feed Additive
Su-Hyeon Kim, In Young Choi, Gyu-Sung Cho, Charles M.A.P. Franz, Mi-Kyung Park
Food Science of Animal Resources.2025; 45(4): 1204. CrossRef

Genetic and Functional Characterization of a Salicylate 1‑monooxygenase Located on an Integrative and Conjugative Element (ICE) in Pseudomonas stutzeri AJR13: Igor Ivanovski , Gerben J. Zylstra; J. Microbiol. 2023;61(12):1025-1032. Published online December 15, 2023; DOI: https://doi.org/10.1007/s12275-023-00093-x

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Pseudomonas stutzeri strain AJR13 was isolated for growth on the related compounds biphenyl (BPH) and diphenylmethane (DPM). The BPH and DPM degradative pathway genes are present on an integrative and conjugative element (ICE) in the chromosome. Examination of the genome sequence of AJR13 revealed a gene encoding a salicylate 1-monooxygenase (salA) associated with the ICE even though AJR13 did not grow on salicylate. Transfer of the ICE to the well-studied Pseudomonas putida KT2440 resulted in a KT2440 strain that could grow on salicylate. Knockout mutagenesis of the salA gene on the ICE in KT2440 eliminated the ability to grow on salicylate. Complementation of the knockout with the cloned salA gene restored growth on salicylate. Transfer of the cloned salA gene under control of the lac promoter to KT2440 resulted in a strain that could grow on salicylate. Heterologous expression of the salA gene in E. coli BL21 DE3 resulted in the production of catechol from salicylate, confirming that it is indeed a salicylate 1-monooxygenase. Interestingly, transfer of the cloned salA gene under control of the lac promoter to AJR13 resulted in a strain that could now grow on salicylate, suggesting that gene expression for the downstream catechol pathway is intact.

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Analysis of Benzoate 1,2‐Dioxygenase Identifies Shared Electron Transfer Components With DxnA1A2 in Rhizorhabdus wittichii RW1
Igor Ivanovski, Suha Eleya, Gerben J. Zylstra
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The β‑Lactamase Activity at the Community Level Confers β‑Lactam Resistance to Bloom‑Forming Microcystis aeruginosa Ce: Yerim Park , Wonjae Kim , Minkyung Kim , Woojun Park; J. Microbiol. 2023;61(9):807-820. Published online October 18, 2023; DOI: https://doi.org/10.1007/s12275-023-00082-0

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Many freshwater cyanobacteria, including Microcystis aeruginosa, lack several known antibiotic resistance genes; however, both axenic and xenic M. aeruginosa strains exhibited high antibiotic resistance against many antibiotics under our tested concentrations, including colistin, trimethoprim, and kanamycin. Interestingly, axenic PCC7806, although not the xenic NIBR18 and NIBR452 strains, displayed susceptibility to ampicillin and amoxicillin, indicating that the associated bacteria in the phycosphere could confer such antibiotic resistance to xenic strains. Fluorescence and scanning electron microscopic observations revealed their tight association, leading to possible community-level β-lactamase activity. Combinatory treatment of ampicillin with a β-lactamase inhibitor, sulbactam, abolished the ampicillin resistance in the xenic stains. The nitrocefin-based assay confirmed the presence of significant community-level β-lactamase activity. Our tested low ampicillin concentration and high β-lactamase activity could potentially balance the competitive advantage of these dominant species and provide opportunities for the less competitive species, thereby resulting in higher bacterial diversity under ampicillin treatment conditions. Non-PCR-based metagenome data from xenic NIBR18 cultures revealed the dominance of blaOXArelated antibiotic resistance genes followed by other class A β-lactamase genes (AST-1 and FAR-1). Alleviation of ampicillin toxicity could be observed only in axenic PCC7806, which had been cocultured with β-lactamase from other freshwater bacteria. Our study suggested M. aeruginosa develops resistance to old-class β-lactam antibiotics through altruism, where associated bacteria protect axenic M. aeruginosa cells.

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Water Research.2025; 287: 124310. CrossRef
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Wonjae Kim, Yerim Park, Minkyung Kim, Yeji Cha, Jaejoon Jung, Che Ok Jeon, Woojun Park
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Minkyung Kim, Jaejoon Jung, Wonjae Kim, Yerim Park, Che Ok Jeon, Woojun Park
Journal of Microbiology.2024; 62(11): 933. CrossRef
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Description of Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. isolated from the Intestines of Aegosoma sinicum Larvae: Hae-In Joe , Jee-Won Choi , June-Young Lee , Hojun Sung , Su-Won Jeong , Yun-Seok Jeong , Jae-Yun Lee , Jin-Woo Bae; J. Microbiol. 2023;61(6):603-613. Published online May 5, 2023; DOI: https://doi.org/10.1007/s12275-023-00051-7

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Three novel bacterial strains, 321T, 335T, and 353T, were isolated from the intestines of Aegosoma sinicum larvae collected from Paju-Si, South Korea. The strains were Gram-negative, obligate aerobe and had rod-shaped cells with a single flagellum. The three strains belonged to the genus Luteibacter in the family Rhodanobacteraceae and shared < 99.2% similarity in their 16S rRNA gene sequence and < 83.56% similarity in thier whole genome sequence. Strains 321T, 335T, and 353T formed a monophyletic clade with Luteibacter yeojuensis KACC 11405T, L. anthropi KACC 17855T, and L. rhizovicinus KACC 12830T, with sequence similarities of 98.77–98.91%, 98.44–98.58%, and 97.88–98.02%, respectively. Further genomic analyses, including the construction of the Up-to-date Bacterial Core Gene (UBCG) tree and assessment of other genome-related indices, indicated that these strains were novel species belonging to the genus Luteibacter. All three strains contained ubiquinone Q8 as their major isoprenoid quinone and iso-C15:0 and summed feature 9 ( C16:0 10-methyl and/or iso-C17:1 ω9c) as their major cellular fatty acids. Phosphatidylethanolamine and diphosphatidylglycerol were the major polar lipids in all the strains. The genomic DNA G + C contents of strains 321T, 335T, and 353T were 66.0, 64.5, and 64.5 mol%, respectively. Based on multiphasic classification, strains 321T, 335T, and 353T were classified into the genus Luteibacter as the type strains of novel species, for which the names Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. are proposed, respectively.

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Influence of Microbiota on Vaccine Effectiveness: “Is the Microbiota the Key to Vaccine‑induced Responses?”: So-Hee Hong; J. Microbiol. 2023;61(5):483-494. Published online April 13, 2023; DOI: https://doi.org/10.1007/s12275-023-00044-6

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Vaccines are one of the most powerful tools for preventing infectious diseases. To effectively fight pathogens, vaccines should induce potent and long-lasting immune responses that are specific to the pathogens. However, not all vaccines can induce effective immune responses, and the responses vary greatly among individuals and populations. Although several factors, such as age, host genetics, nutritional status, and region, affect the effectiveness of vaccines, increasing data have suggested that the gut microbiota is critically associated with vaccine-induced immune responses. In this review, I discuss how gut microbiota affects vaccine effectiveness based on the clinical and preclinical data, and summarize possible underlying mechanisms related to the adjuvant effects of microbiota. A better understanding of the link between vaccine-induced immune responses and the gut microbiota using high-throughput technology and sophisticated system vaccinology approaches could provide crucial insights for designing effective personalized preventive and therapeutic vaccination strategies.

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Microbial metabolic responses and CO2 emissions differentiated by soil water content variation in subarctic tundra soils: Dockyu Kim , Namyi Chae , Mincheol Kim , Sungjin Nam , Tai Kyoung Kim , Ki-Tea Park , Bang Yong Lee , Eungbin Kim , Hyoungseok Lee; J. Microbiol. 2022;60(12):1130-1138. Published online November 24, 2022; DOI: https://doi.org/10.1007/s12275-022-2378-3

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Recent rapid air temperature increases across the northernlatitude tundra have prolonged permafrost thawing and snow melting periods, resulting in increased soil temperature (Ts) and volumetric soil water content (SWC). Under prolonged soil warming at 8°C, Alaskan tundra soils were incubated in a microcosm system and examined for the SWC differential influence on the microbial decomposition activity of large molecular weight (MW) humic substances (HS). When one microcosm soil (AKC1-1) was incubated at a constant SWC of 41% for 90 days (T = 90) and then SWC was gradually decreased from 41% to 29% for another T = 90, the initial HS was partly depolymerized. In contrast, in AKC1-2 incubated at a gradually decreasing SWC from the initial 32% to 10% for T = 90 and then increasing to 27% for another T = 90, HS depolymerization was undetected. Overall, the microbial communities in AKC1-1 could maintain metabolic activity at sufficient and constant SWC during the initial T = 90 incubation. In contrast, AKC1-2 microbes may have been damaged by drought stress during the drying SWC regimen, possibly resulting in the loss of HS decomposition activity, which did not recover even after re-wetting to an optimal SWC range (20–40%). After T = 90, the CO2 production in both treatments was attributed to the increased decomposition of small-MW organic compounds (including aerobic HS-degradative products) within an optimal SWC range. We expect this study to provide new insights into the early effects of warming- and topography-induced SWC variations on the microbial contribution to CO2 emissions via HS decomposition in northern-latitude tundra soil.

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Unidirectional freeze–thaw redistributes water and amplifies soil microbial heterogeneity in a mecrocosm experiment
Huimin Liu, Yaxian Hu, Yuan Song, Xianwen Li, Xiaorong Wei
Geoderma.2025; 453: 117126. CrossRef
Analysis of CO2 Emission from Urban Soils of the Kola Peninsula (European Arctic)
M. V. Korneykova, V. I. Vasenev, N. V. Saltan, M. V. Slukovskaya, A. S. Soshina, M. S. Zavodskikh, Yu. L. Sotnikova, A. V. Dolgikh
Eurasian Soil Science.2023; 56(11): 1653. CrossRef
Analysis of CO₂ Emission by Urban Soils under the Conditions of the Kola North
M. V. Korneykova, V. I. Vasenev, N. V. Saltan, M. V. Slukovskaya, A. S. Soshina, M. S. Zavodskikh, Y. L. Sotnikova, A. V. Dolgikh
Почвоведение.2023; (11): 1385. CrossRef

Fus3 and Tpk2 protein kinases regulate the phosphorylation-dependent functions of RNA helicase Dhh1 in yeast mating and Ste12 protein expression: Jaehee Hwang , Daehee Jung , Jinmi Kim; J. Microbiol. 2022;60(8):843-848. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2213-x

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Abstract PDF: Decapping of mRNA is a key regulatory step for mRNA decay and translation. The RNA helicase, Dhh1, is known as a decapping activator and translation repressor in yeast Saccharomyces cerevisiae. Dhh1 also functions as a gene-specific positive regulator in the expression of Ste12, a mating-specific transcription factor. A previous study showed that the Nerminal phosphorylation of Dhh1 regulates its association with the mRNA-binding protein, Puf6, to affect the protein translation of Ste12. Here, we investigated the roles of the phosphorylated residues of Dhh1 in yeast mating process and Ste12 expression. The phospho-deficient mutation, DHH1- T10A, was associated with decreased diploid formation during mating and decreased level of the Ste12 protein in response to α-mating pheromone. A kinase overexpression analysis revealed that Ste12 protein expression was affected by overexpression of Fus3 MAP kinase or Tpk2 kinase. Tpk2 was shown to be responsible for phosphorylation of Dhh1 at Thr10. Our study shows that overexpression of Fus3 or Tpk2 alters the Dhh1-Puf6 protein interaction and thereby affects Ste12 protein expression.

Characterization of antibiotic-resistant, coagulase-negative staphylococci from fresh produce and description of Staphylococcus shinii sp. nov. isolated from chives: Gyu-Sung Cho , Bo Li , Erik Brinks , Charles , M.A.P. Franz; J. Microbiol. 2022;60(9):877-889. Published online June 22, 2022; DOI: https://doi.org/10.1007/s12275-022-2100-5

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Coagulase-negative Staphylococcus (CoNS) species may possess antibiotic resistance genes and have been associated with nosocomial infections. In this study, 91 CoNS with decreased susceptibility to oxacillin were isolated from fresh produce using oxacillin containing agar plates. Their antibiotic resistances were determined phenotypically and all isolates were identified by rep-PCR, 16S rRNA and rpoB gene sequencing. Furthermore, the genomes of representative strains were sequenced in order to confirm species identification by phylogenomics. The majority (64 of 91) of the CoNS strains could be identified as Mammaliicoccus (M.) fleurettii, while 13 were identified as M. sciuri, 8 as M. vitulinus, 2 as Staphylococcus (S.) epidermidis and single strains each as S. warneri, S. xylosus, Staphylococcus spp. and S. casei. Most of the strains were generally susceptible to clinically-relevant antibiotics, but only few (< 7%) strains possessed multiple resistances. Both oxacillin and cefoxitin resistant isolates were considered to be presumptive methicillin-resistant CoNS. From whole genome sequencing data of 6 representative strains, the mecA gene, accessory genes and the SCC loci were compared, which revealed high variability between some of the strains. The major fatty acids of K22-5MT strain included anteiso-C15:0, iso-C15:0, iso-C17:0, anteiso-C17:0, C18:0, and C20:0. Average nucleotide identity and digital DNA-DNA hybridization values indicated that Staphylococcus strain K22-5MT was below the species delineation cutoff values for ANI (less than 91%) and DDH (less than 44.4%), with the most closely related species being the S. pseudoxylosus S04009T type strain. Thus, strain K22- 5MT (=DSM 112532T, =LMG 32324T) represents a novel species, for which the name Staphylococcus shinii sp. nov. is proposed.

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Whole genome sequencing of non-aureus Staphylococcus species from poultry barn bioaerosols across Alberta reveals circulation of isolates with multiple antibiotic resistant genes and disinfectant resistant genes
Awais Ghaffar, Karen Liljebjelke, Sylvia Checkley, Frank van der Meer, Muhammad Farooq, Heshanthi Herath Mudiyanselage, Mohamed Faizal Abdul-Careem
Journal of Global Antimicrobial Resistance.2025; 43: 18. CrossRef
Microbial agents for the control of ticks Rhipicephalus microplus
Edgar Castro-Saines, Rodolfo Lagunes-Quintanilla, Rubén Hernández-Ortiz
Parasitology Research.2024;[Epub] CrossRef
Scandinavium lactucae sp. nov. Isolated from Healthy Lettuce in South Korea
Jiwon Park, Sieun Park, Kwang-Kyo Oh, Charles M. A. P. Franz, Gyu-Sung Cho
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Efficacy of Entomopathogenic Staphylococcus Bacteria as a Biocontrol Agent against Rhipicephalus microplus Ticks: Assessing Reproductive Inhibition and Mortality Rates
Raquel Cossio-Bayugar, Cesar A. Arreguin-Perez, Hugo Aguilar-Diaz, Estefan Miranda-Miranda
Microorganisms.2024; 12(3): 551. CrossRef
Genomic exploration of the fermented meat isolate Staphylococcus shinii IMDO-S216 with a focus on competitiveness-enhancing secondary metabolites
Ana Sosa-Fajardo, Cristian Díaz-Muñoz, David Van der Veken, Inés Pradal, Marko Verce, Stefan Weckx, Frédéric Leroy
BMC Genomics.2024;[Epub] CrossRef
Staphylococcus hsinchuensis sp. nov., Isolated from Soymilk
Yu-Ting Wang, Yu-Chun Lin, Yi-Huei Hsieh, Yu-Tzu Lin, Moriyuki Hamada, Chih-Chieh Chen, Jong-Shian Liou, Ai-Yun Lee, Wei-Ling Zhang, Yung-Tsung Chen, Chien-Hsun Huang
Pathogens.2024; 13(4): 343. CrossRef
Validation List no. 209. Valid publication of new names and new combinations effectively published outside the IJSEM
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Meta-Analysis

Proposal of a health gut microbiome index based on a meta-analysis of Korean and global population datasets: Hyun-Seok Oh , Uigi Min , Hyejin Jang , Namil Kim , Jeongmin Lim , Mauricio Chalita , Jongsik Chun; J. Microbiol. 2022;60(5):533-549. Published online March 31, 2022; DOI: https://doi.org/10.1007/s12275-022-1526-0

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The disruption of the human gut microbiota has been linked to host health conditions, including various diseases. However, no reliable index for measuring and predicting a healthy microbiome is currently available. Here, the sequencing data of 1,663 Koreans were obtained from three independent studies. Furthermore, we pooled 3,490 samples from public databases and analyzed a total of 5,153 fecal samples. First, we analyzed Korean gut microbiome covariates to determine the influence of lifestyle on variation in the gut microbiota. Next, patterns of microbiota variations across geographical locations and disease statuses were confirmed using a global cohort and disease data. Based on comprehensive comparative analysis, we were able to define three enterotypes among Korean cohorts, namely, Prevotella type, Bacteroides type, and outlier type. By a thorough categorization of dysbiosis and the evaluation of microbial characteristics using multiple datasets, we identified a wide spectrum of accuracy levels in classifying health and disease states. Using the observed microbiome patterns, we devised an index named the gut microbiome index (GMI) that could consistently predict health conditions from human gut microbiome data. Compared to ecological metrics, the microbial marker index, and machine learning approaches, GMI distinguished between healthy and non-healthy individuals with a higher accuracy across various datasets. Thus, this study proposes a potential index to measure health status of gut microbiome that is verified from multiethnic data of various diseases, and we expect this model to facilitate further clinical application of gut microbiota data in future.

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Methodology for Assessing Patient Centricity and Data Integrity in Clinical Trials With Decentralized Elements: A Pilot Trial on Mastic Gum
Jiyeon Park, Ki Young Huh, Jae‐Yong Chung, Kyung‐Sang Yu
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A comparison of the prevalence of respiratory pathogens and opportunistic respiratory pathogenic profile of ‘clean’ and ‘unclean’ removable dental prostheses
Tong Wah Lim, Shi Huang, Yufeng Zhang, Michael Francis Burrow, Colman McGrath
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Characterization of pathogenic microbiome on removable prostheses with different levels of cleanliness using 2bRAD-M metagenomic sequencing
Tong Wah Lim, Shi Huang, Yuesong Jiang, Yufeng Zhang, Michael Francis Burrow, Colman McGrath
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Gut microbial signatures in clinically stable ulcerative colitis according to the mucosal state and associated symptoms
Soyoung Kim, Yeonjae Jung, Seung Bum Lee, Hyun‐Seok Oh, Sung Noh Hong
Journal of Gastroenterology and Hepatology.2024; 39(2): 319. CrossRef
Difference in gut microbial dysbiotic patterns between body-first and brain-first Parkinson's disease
Don Gueu Park, Woorim Kang, In-Ja Shin, Mauricio Chalita, Hyun-Seok Oh, Dong-Wook Hyun, Hyun Kim, Jongsik Chun, Young-Sil An, Eun Jeong Lee, Jung Han Yoon
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Should Routine Diagnostics Implement Gut Microbiota Analysis?
Giuseppe Guido Maria Scarlata, Ludovico Abenavoli
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Feasibility study for a fully decentralized clinical trial in participants with functional constipation symptoms
Ki Young Huh, Woo Kyung Chung, Jiyeon Park, SeungHwan Lee, Min‐Gul Kim, Jaeseong Oh, Kyung‐Sang Yu
Clinical and Translational Science.2023; 16(11): 2177. CrossRef
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Car Reen Kok, Devin Rose, Robert Hutkins
Annual Review of Food Science and Technology.2023; 14(1): 157. CrossRef
Effects of the multidomain intervention with nutritional supplements on cognition and gut microbiome in early symptomatic Alzheimer’s disease: a randomized controlled trial
Eun Hye Lee, Geon Ha Kim, Hee Kyung Park, Hae Jin Kang, Yoo Kyoung Park, Hye Ah Lee, Chang Hyung Hong, So Young Moon, Woorim Kang, Hyun-Seok Oh, Hai-Jeon Yoon, Seong Hye Choi, Jee Hyang Jeong
Frontiers in Aging Neuroscience.2023;[Epub] CrossRef
Fecal microbial signatures of healthy Han individuals from three bio-geographical zones in Guangdong
Litao Huang, Liting Deng, Changhui Liu, Enping Huang, Xiaolong Han, Cheng Xiao, Xiaomin Liang, Huilin Sun, Chao Liu, Ling Chen
Frontiers in Microbiology.2022;[Epub] CrossRef

Journal Articles

Evaluation of Cyc1 protein stability in Acidithiobacillus ferrooxidans bacterium after E121D mutation by molecular dynamics simulation to improve electron transfer: Mahnaz Shojapour , Somayeh Farahmand , Faezeh Fatemi , Marzieh Dehghan Shasaltaneh; J. Microbiol. 2022;60(5):526-532. Published online March 14, 2022; DOI: https://doi.org/10.1007/s12275-022-1645-7

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Cyc1 (Cytochrome c552) is a protein in the electron transport chain of the Acidithiobacillus ferrooxidans (Af) bacteria which obtain their energy from oxidation Fe2+ to Fe3+. The electrons are directed through Cyc2, RCY (rusticyanin), Cyc1, and Cox aa3 proteins to O2. Cyc1 protein consists of two chains, A and B. In the present study, a novel mutation (E121D) in the A chain of Cyc1 protein was selected due to electron receiving from Histidine 143 of RCY. Then, the changes performed in the E121D mutant were evaluated by MD simulations analyzes. Cyc1 and RCY proteins were docked by a Patchdock server. By E121D mutation, the connection between Zn 1388 of chain B and aspartate 121 of chain A weaken. Asp 121 gets farther from Zn 1388. Therefore, the aspartate gets closer to Cu 1156 of the RCY leading to the higher stability of the RCY/ Cyc1 complex. Further, an acidic residue (Glu121) becomes a more acidic residue (Asp121) and improves the electron transfer to Cyc1 protein. The results of RMSF analysis showed further ligand flexibility in mutation. This leads to fluctuation of the active site and increases redox potential at the mutation point and the speed of electron transfer. This study also predicts that in all respiratory chain proteins, electrons probably enter the first active site via glutamate and exit histidine in the second active site of each respiratory chain protein.

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Point mutation consideration in CcO protein of the electron transfer chain by MD simulation
Mahnaz Shojapour, Somayeh Farahmand
Journal of Molecular Graphics and Modelling.2022; 117: 108309. CrossRef

Cytophaga hutchinsonii chu_2177, encoding the O-antigen ligase, is essential for cellulose degradation: Yahong Tan , Wenxia Song , Lijuan Gao , Weican Zhang , Xuemei Lu; J. Microbiol. 2022;60(4):364-374. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1531-3

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Cytophaga hutchinsonii can efficiently degrade crystalline cellulose, in which the cell surface cellulases secreted by the type IX secretion system (T9SS) play important roles, but the degradation mechanism remains unclear, and the anchor mechanism of cellulases on the outer membrane in C. hutchinsonii has not been studied. Here, chu_2177 was identified by transposon mutagenesis and was proved to be indispensable for cellulose utilization in C. hutchinsonii. Disruption of chu_2177 resulted in O-antigen deficiency and chu_ 177 could confer O-antigen ligase activity upon an Escherichia coli waal mutant, indicating that chu_2177 encoded the Ontigen ligase. Moreover, deletion of chu_2177 caused defects in cellulose utilization, cell motility, biofilm formation, and stress resistance. Further study showed that the endoglucanase activity was markedly decreased in the outer membrane but was increased in the culture fluid without chu_2177. Western blot proved that endoglucanase CHU_1336 was not located on the outer membrane but was released in the culture fluid of the Δ2177 mutant. Further proteomics analysis showed that many cargo proteins of T9SS were missing in the outer membrane of the Δ2177 mutant. Our study revealed that the deletion of chu_2177 affected the localization of many T9SS cargo proteins including cellulases on the outer membrane of C. hutchinsonii.

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Screening and genome-wide analysis of lignocellulose-degrading bacteria from humic soil
Tianjiao Zhang, Shuli Wei, Yajie Liu, Chao Cheng, Jie Ma, Linfang Yue, Yanrong Gao, Yuchen Cheng, Yongfeng Ren, Shaofeng Su, Xiaoqing Zhao, Zhanyuan Lu
Frontiers in Microbiology.2023;[Epub] CrossRef
The type IX secretion system: Insights into its function and connection to glycosylation in Cytophaga hutchinsonii
Wenxia Song, Xueke Zhuang, Yahong Tan, Qingsheng Qi, Xuemei Lu
Engineering Microbiology.2022; 2(3): 100038. CrossRef

Changpingibacter yushuensis gen. nov., sp. nov., isolated from fluvial sediment in Qinghai Tibet Plateau of China: Yifan Jiao , Sihui Zhang , Jing Yang , Xin-He Lai , Kui Dong , Yanpeng Cheng , Mingchao Xu , Wentao Zhu , Shan Lu , Dong Jin , Ji Pu , Ying Huang , Liyun Liu , Suping Wang , Jianguo Xu; J. Microbiol. 2022;60(2):147-155. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1199-8

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Two facultatively anaerobic, short rod-shaped, non-motile, Gram-stain-positive, unknown bacterial strains (JY-X040T and JY-X174) were isolated from fluvial sediments of Tongtian River in Yushu Tibetan Autonomous Prefecture, Qinghai province, China. Cells formed translucent, gray, round and convex colonies, with a diameter of less than 0.5 mm after 5 days of incubation at 30°C on brain heart infusion-5% sheep blood agar. The 16S rRNA gene sequence similarity between strain JY-X040T and Fudania jinshanensis 313T is 93.87%. In the four phylogenetic trees constructed based on the 16S rRNA gene and 423 core genes, the two isolates form an independent branch, phylogenetically closest to F. jinshanensis 313T, but could not be classified as a member of the genus Fudania or any other genus of the family Arcanobacteriaceae. The DNA G + C content of strain JY-X040T was 57.8%. Calculation
results
of average nucleotide identity, digital DNADNA hybridization value and amino acid identity between strain JY-X040T and F. jinshanensis 313T are 69.9%, 22.9%, and 64.1%. The major cellular fatty acids were C16:0 (23%) and C18:1ω9c (22%). The cell-wall peptidoglycan type was A5α (L-Lys-L-Ala-L-Lys-D-Glu). The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside and four unidentified components. The whole-cell sugars contained rhamnose and ribose. MK-10(H4) was the sole respiratory quinone. The minimum inhibitory concentration of streptomycin was 32 μg/ml. All physiological, biochemical, chemotaxonomic and genomic characteristics support that strains JY-X040T and JY-X174 represent members of a novel species in a new genus, Changpingibacter yushuensis gen. nov., sp. nov. The type strain is JY-X040T (GDMCC 1.1996T = KCTC 49514T).

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Metagenomic and Culturomics Analysis of Microbial Communities within Surface Sediments and the Prevalence of Antibiotic Resistance Genes in a Pristine River: The Zaqu River in the Lancang River Source Region, China
Yi Yan, Jialiang Xu, Wenmin Huang, Yufeng Fan, Zhenpeng Li, Mingkai Tian, Jinsheng Ma, Xin Lu, Jian Liang
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Bacterial diversity in arboreal ant nesting spaces is linked to colony developmental stage
Maximilian Nepel, Veronika E. Mayer, Veronica Barrajon-Santos, Dagmar Woebken
Communications Biology.2023;[Epub] CrossRef

Regulation of iron homeostasis by peroxide-sensitive CatR, a Fur-family regulator in Streptomyces coelicolor: Yeonbum Kim , Jung-Hye Roe , Joo-Hong Park , Yong-Joon Cho , Kang-Lok Lee; J. Microbiol. 2021;59(12):1083-1091. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1457-1

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CatR, a peroxide-sensing transcriptional repressor of Fur family, can de-repress the transcription of the catA gene encoding catalase upon peroxide stress in Streptomyces coelicolor. Since CatR-regulated genes other than catA and its own gene catR have not been identified in detail, the understanding of the role of CatR regulon is very limited. In this study, we performed transcriptomic analysis to identify genes influenced by both 􀈟􀂊atR mutation and hydrogen peroxide treatment. Through ChIP-qPCR and other analyses, a new consensus sequence was found in CatR-responsive promoter region of catR gene and catA operon for direct regulation. In addition, vtlA (SCO2027) and SCO4983 were identified as new members of the CatR regulon. Expression levels of iron uptake genes were reduced by hydrogen peroxide and a DmdR1 binding sequence was identified in promoters of these genes. The increase in free iron by hydrogen peroxide was thought to suppress the iron import system by DmdR1. A putative exporter protein VtlA regulated by CatR appeared to reduce intracellular iron to prevent oxidative stress. The name vtlA (VIT1-like transporter) was proposed for iron homeostasis related gene SCO2027.

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Mingxuan Wang, Honglin Li
Journal of Agricultural and Food Chemistry.2025; 73(8): 4425. CrossRef
Autonomous Defense Based on Biogenic Nanoparticle Formation in Daunomycin-Producing Streptomyces
Karel Beneš, Vladislav Čurn, Baveesh Pudhuvai, Jaroslav Motis, Zuzana Michalcová, Andrea Bohatá, Jana Lencová, Jan Bárta, Michael Rost, Andreas Vilcinskas, Vladimír Maťha
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Genome mining based on transcriptional regulatory networks uncovers a novel locus involved in desferrioxamine biosynthesis
Hannah E. Augustijn, Zachary L. Reitz, Le Zhang, Jeanine A. Boot, Somayah S. Elsayed, Gregory L. Challis, Marnix H. Medema, Gilles P. van Wezel, Tobias Bollenbach
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Pirin, a redox-sensitive modulator of beta-oxidation, generates hydroxyl radicals and interacts with CatR, the transcriptional repressor of the major vegetative catalase gene in Streptomyces
Matteo Calcagnile, Fabrizio Damiano, Adelfia Talà, Pietro Alifano
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Functional versatility of Zur in metal homeostasis, motility, biofilm formation, and stress resistance in Yersinia pseudotuberculosis
Yanchao Gu, Yongde Liu, Wei Mao, Ying Peng, Xiaoru Han, Han Jin, Jingling Xu, Liyang Chang, Yixin Hou, Xihui Shen, Xingyu Liu, Yantao Yang, G. Marcela Rodriguez
Microbiology Spectrum.2024;[Epub] CrossRef
Multi-integrated approach for unraveling small open reading frames potentially associated with secondary metabolism in Streptomyces
Si-Min Fan, Ze-Qi Li, Shi-Zhe Zhang, Liang-Yu Chen, Xi-Ying Wei, Jian Liang, Xin-Qing Zhao, Chun Su, Xiao-Hua Zhang
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The regulatory role of Fur-encoding SCLAV_3199 in iron homeostasis in Streptomyces clavuligerus
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Salmonella Typhimurium ST313 isolated in Brazil revealed to be more invasive and inflammatory in murine colon compared to ST19 strains: Amanda Aparecida Seribelli , Tamara R. Machado Ribeiro , Patrick da Silva† , Isabela Mancini Martins , Felipe Pinheiro Vilela , Marta I. Cazentini Medeiros , Kamila Chagas Peronni , Wilson Araújo da Silva Junior , Cristiano Gallina Moreira , Juliana Pfrimer Falcão; J. Microbiol. 2021;59(9):861-870. Published online August 12, 2021; DOI: https://doi.org/10.1007/s12275-021-1082-z

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Salmonella Typhimurium (ST313) has caused an epidemic of invasive disease in sub-Saharan Africa and has been recently identified in Brazil. As the virulence of this ST is poorly understood, the present study aimed to (i) perform the RNAseq in vitro of S. Typhimurium STm30 (ST313) grown in Luria-Bertani medium at 37°C; (ii) compare it with the RNAseq of the S. Typhimurium SL1344 (ST19) and S. Typhimurium STm11 (ST19) strains under the same growing conditions; and (iii) examine the colonization capacity and expression of virulence genes and cytokines in murine colon. The STm30 (ST313) strain exhibited stronger virulence and was associated with a more inflammatory profile than the strains SL1344 (ST19) and STm11 (ST19), as demonstrated by transcriptome and in vivo assay. The expression levels of the hilA, sopD2, pipB, and ssaS virulence genes, other Salmonella pathogenicity islands SPI-1 and SPI-2 genes or effectors, and genes of the cytokines IL-1β, IFN-γ, TNF-α, IL-6, IL-17, IL-22, and IL-12 were increased during ST313 infection in C57BL/6J mice. In conclusion, S. Typhimurium STm30 (ST313) isolated from human feces in Brazil express higher levels of pathogenesis- related genes at 37°C and has stronger colonization and invasion capacity in murine colon due to its high expression levels of virulence genes, when compared with the S. Typhimurium SL1344 (ST19) and STm11 (ST19) strains. STm30 (ST313) also induces stronger expression of pro-inflammatory cytokines in this organ, suggesting that it causes more extensive tissue damage.

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Mina Rahiminejad, Maryam Montaseri, Mohammad Hashem Yousefi, Saeed Nazifi, Jeroen Wagemans, Saeid Hosseinzadeh
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Virulence potential of Salmonella 1,4, [5],12:i:- strains isolated during decades from different sources in the Southeast region of Brazil
Giovana do Nascimento Pereira, Amanda Aparecida Seribelli, Carolina Nogueira Gomes, Felipe Pinheiro Vilela, Ludmilla Tonani, Monique Ribeiro Tiba-Casas, Marta Inês Cazentini Medeiros, Dália dos Prazeres Rodrigues, Márcia Regina von Zeska Kress, Juliana Pf
Brazilian Journal of Microbiology.2023; 54(4): 2827. CrossRef
Invasive non-typhoidal Salmonella (iNTS) aminoglycoside-resistant ST313 isolates feature unique pathogenic mechanisms to reach the bloodstream
Isabela Mancini Martins, Amanda Aparecida Seribelli, Tamara R. Machado Ribeiro, Patrick da Silva, Bruna Cardinali Lustri, Rodrigo T. Hernandes, Juliana Pfrimer Falcão, Cristiano Gallina Moreira
Infection, Genetics and Evolution.2023; 116: 105519. CrossRef
Regulator of RNase E activity modulates the pathogenicity of Salmonella Typhimurium
Jaejin Lee, Eunkyoung Shin, Ji-Hyun Yeom, Jaeyoung Park, Sunwoo Kim, Minho Lee, Kangseok Lee
Microbial Pathogenesis.2022; 165: 105460. CrossRef
Antimicrobial resistance and genetic background of non-typhoidal Salmonella enterica strains isolated from human infections in São Paulo, Brazil (2000–2019)
Aline Parolin Calarga, Marco Tulio Pardini Gontijo, Luiz Gonzaga Paula de Almeida, Ana Tereza Ribeiro de Vasconcelos, Leandro Costa Nascimento, Taíse Marongio Cotrim de Moraes Barbosa, Thalita Mara de Carvalho Perri, Silvia Regina dos Santos, Monique Ribe
Brazilian Journal of Microbiology.2022; 53(3): 1249. CrossRef

Salicibibacter cibarius sp. nov. and Salicibibacter cibi sp. nov., two novel species of the family Bacillaceae isolated from kimchi: Young Joon Oh , Joon Yong Kim , Seul Ki Lim , Min-Sung Kwon , Hak-Jong Choi; J. Microbiol. 2021;59(5):460-466. Published online April 28, 2021; DOI: https://doi.org/10.1007/s12275-021-0513-1

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To date, all species in the genus Salicibibacter have been isolated in Korean commercial kimchi. We aimed to describe the taxonomic characteristics of two strains, NKC5-3T and NKC21-4T, isolated from commercial kimchi collected from various regions in the Republic of Korea. Cells of these strains were rod-shaped, Gram-positive, aerobic, oxidase- and catalase- positive, non-motile, halophilic, and alkalitolerant. Both strains, unlike other species of the genus Salicibibacter, could not grow without NaCl. Strains NKC5-3T and NKC21-4T could tolerate up to 25.0% (w/v) NaCl (optimum 10%) and grow at pH 7.0–10.0 (optimum 8.5) and 8.0–9.0 (optimum 8.5), respectively; they showed 97.1% 16S rRNA gene sequence similarity to each other and were most closely related to S. kimchii NKC1-1T (97.0% and 96.8% similarity, respectively). The genome of strain NKC5-3T was nearly 4.6 Mb in size, with 4,456 protein-coding sequences (CDSs), whereas NKC21-4T genome was nearly 3.9 Mb in size, with 3,717 CDSs. OrthoANI values between the novel strains and S. kimchii NKC1-1T were far lower than the species demarcation threshold. NKC5-3T and NKC21-4T clustered together to form branches that were distinct from the other Salicibibacter species. The major fatty acids in these strains were anteiso-C15:0 and anteiso-C17:0, and the predominant menaquinone was menaquinone-7. The polar lipids of NKC5-3T included diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), and five unidentified phospholipids (PL), and those of NKC21-4T included DPG, PG, seven unidentified PLs, and an unidentified lipid. Both isolates had DPG, which is the first case in the genus Salicibibacter. The genomic G + C content of strains NKC5-3T and NKC21-4T was 44.7 and 44.9 mol%, respectively. Based on phenotypic, genomic, phylogenetic, and chemotaxonomic analyses, strains NKC5-3T (= KACC 22040T = DSM 111417T) and NKC21-4T (= KACC 22041T = DSM 111418T) represent two novel species of the genus Salicibibacter, for which the names Salicibibacter cibarius sp. nov. and Salicibibacter cibi sp. nov. are proposed.

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In-silico study of molecular adaptations in halophilic Cas9
Anisha Debnath, Aveepsa Sengupta, Sujata Rudrapal, Ashutosh Kumar, Mamta Rani
Letters in Applied Microbiology.2025;[Epub] CrossRef
Valid publication of new names and new combinations effectively published outside the IJSEM
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Effects of digested Cheonggukjang on human microbiota assessed by in vitro fecal fermentation: Vineet Singh , Nakwon Hwang , Gwangpyo Ko , Unno Tatsuya; J. Microbiol. 2021;59(2):217-227. Published online February 1, 2021; DOI: https://doi.org/10.1007/s12275-021-0525-x

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In vitro fecal fermentation is an assay that uses fecal microbes to ferment foods, the results of which can be used to evaluate the potential of prebiotic candidates. To date, there have been various protocols used for in vitro fecal fermentation- based assessments of food substances. In this study, we investigated how personal gut microbiota differences and external factors affect the results of in vitro fecal fermentation assays. We used Cheonggukjang (CGJ), a Korean traditional fermented soybean soup that is acknowledged as healthy functional diet. CGJ was digested in vitro using acids and enzymes, and then fermented with human feces anaerobically. After fecal fermentation, the microbiota was analyzed using MiSeq, and the amount of short chain fatty acids (SCFAs) were measured using GC-MS. Our results suggest that CGJ was effectively metabolized by fecal bacteria to produce SCFAs, and this process resulted in an increase in the abundance of Coprococcus, Ruminococcus, and Bifidobacterium and a reduction in the growth of Sutterella, an opportunistic pathogen. The metabolic activities predicted from the microbiota shifts indicated enhanced metabolism linked to methionine biosynthesis and depleted chondroitin sulfate degradation. Moreover, the amount of SCFAs and microbiota shifts varied depending on personal microbiota differences. Our findings also suggest that in vitro fecal fermentation of CGJ for longer durations may partially affect certain fecal microbes. Overall, the study discusses the usability of in vitro gastrointestinal digestion and fecal fermentation (GIDFF) to imitate the effects of diet-induced microbiome modulation and its impact on the host.

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Eun-Ji Song, Min Jung Kim, Chang Hwa Jung, Won-Hyong Chung, Young-Do Nam, Mi Young Lim
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Role, relevance, and possibilities of in vitro fermentation models in human dietary, and gut‐microbial studies
Vineet Singh, HyunWoo Son, GyuDae Lee, Sunwoo Lee, Tatsuya Unno, Jae‐Ho Shin
Biotechnology and Bioengineering.2022; 119(11): 3044. CrossRef
Evaluation of Prebiotics through an In Vitro Gastrointestinal Digestion and Fecal Fermentation Experiment: Further Idea on the Implementation of Machine Learning Technique
Hokyung Song, Dabin Jeon, Tatsuya Unno
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Vineet Singh, GyuDae Lee, HyunWoo Son, Sliti Amani, Mamta Baunthiyal, Jae-Ho Shin
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Current Perspectives on the Physiological Activities of Fermented Soybean-Derived Cheonggukjang
Il-Sup Kim, Cher-Won Hwang, Woong-Suk Yang, Cheorl-Ho Kim
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Ting Zhang, Myeong-Seon Ryu, Xuangao Wu, Hee-Jong Yang, Su Ji Jeong, Ji-Won Seo, Do-Yeon Jeong, Sunmin Park
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Spot 42 RNA regulates putrescine catabolism in Escherichia coli by controlling the expression of puuE at the post-transcription level: Xin Sun , Ruyan Li , Guochen Wan , Wanli Peng , Shuangjun Lin , Zixin Deng , Rubing Liang; J. Microbiol. 2021;59(2):175-185. Published online February 1, 2021; DOI: https://doi.org/10.1007/s12275-021-0421-4

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Putrescine, a typical polyamine compound important for cell growth and stress resistance, can be utilized as an energy source. However, the regulation of its catabolism is unclear. Here the small RNA (sRNA) Spot 42, an essential regulator of carbon catabolite repression (CCR), was confirmed to participate in the post-transcriptional regulation of putrescine catabolism in Escherichia coli. Its encoding gene spf exclusively exists in the γ-proteobacteria and contains specific binding sites to the 5􍿁-untranslated regions of the puuE gene, which encodes transaminase in the glutamylated putrescine pathway of putrescine catabolism converting γ-aminobutyrate (GABA) into succinate semialdehyde (SSA). The transcription of the spf gene was induced by glucose, inhibited by putrescine, and unaffected by PuuR, the repressor of puu genes. Excess Spot 42 repressed the expression of PuuE significantly in an antisense mechanism through the direct and specific base-pairing between the 51–57 nt of Spot 42 and the 5􍿁- UTR of puuE. Interestingly, Spot 42 mainly influenced the stability of the puuCBE transcript. This work revealed the regulatory role of Spot 42 in putrescine catabolism, in the switch between favorable and non-favorable carbon source utilization, and in the balance of metabolism of carbon and nitrogen sources.

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Soil water content as a critical factor for stable bacterial community structure and degradative activity in maritime Antarctic soil: Dockyu Kim , Namyi Chae , Mincheol Kim , Sungjin Nam , Eungbin Kim , Hyoungseok Lee; J. Microbiol. 2020;58(12):1010-1017. Published online December 2, 2020; DOI: https://doi.org/10.1007/s12275-020-0490-9

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Recent increases in air temperature across the Antarctic Peninsula may prolong the thawing period and directly affect the soil temperature (Ts) and volumetric soil water content (SWC) in maritime tundra. Under an 8°C soil warming scenario, two customized microcosm systems with maritime Antarctic soils were incubated to investigate the differential influence of SWC on the bacterial community and degradation activity of humic substances (HS), the largest constituent of soil organic carbon and a key component of the terrestrial ecosystem. When the microcosm soil (KS1-4Feb) was incubated for 90 days (T = 90) at a constant SWC of ~32%, the initial HS content (167.0 mg/g of dried soil) decreased to 156.0 mg (approximately 6.6% loss, p < 0.05). However, when another microcosm soil (KS1-4Apr) was incubated with SWCs that gradually decreased from 37% to 9% for T = 90, HS degradation was undetected. The low HS degradative activity persisted, even after the SWC was restored to 30% with water supply for an additional T = 30. Overall bacterial community structure remained relatively stable at a constant SWC setting (KS1-4Feb). In contrast, we saw marked shifts in the bacterial community structure with the changing SWC regimen (KS1-4Apr), suggesting that the soil bacterial communities are vulnerable to drying and re-wetting conditions. These microcosm experiments provide new information regarding the effects of constant SWC and higher Ts on bacterial communities for HS degradation in maritime Antarctic tundra soil.

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Monthly distribution of ammonia-oxidizing microbes in a tropical bay: Tie-Qiang Mao , Yan-Qun Li , Hong-Po Dong , Wen-Na Yang , Li-Jun Hou; J. Microbiol. 2021;59(1):10-19. Published online November 17, 2020; DOI: https://doi.org/10.1007/s12275-021-0287-5

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Ammonia oxidation, performed by ammonia-oxidizing archaea (AOA) and bacteria (AOB), plays a critical role in the cycle of nitrogen in the ocean. For now, environmental variables controlling distribution of ammonia-oxidizing microbes are still largely unknown in oceanic environments. In this study, we used real-time quantitative PCR and high-throughput sequencing
methods
to investigate the abundance and diversity of AOA and AOB from sediment and water in Zhanjiang Bay. Phylogenic analysis revealed that the majority of AOA amoA sequences in water and sediment were affiliated with the genus Nitrosopumilus, whereas the Nitrosotalea cluster was only detected with low abundance in water. Nitrosomonas and Nitrosospira dominated AOB amoA sequences in water and sediment, respectively. The amoA copy numbers of both AOA and AOB varied significantly with month for both sediment and water. When water and sediment temperature dropped to 17– 20°C in December and February, respectively, the copy number of AOB amoA genes increased markedly and was much higher than for AOA amoA genes. Also, AOA abundance in water peaked in December when water temperature was lowest (17–20°C). Stepwise multiple regression analyses revealed that temperature was the most key factor driving monthly changes of AOA or AOB abundance. It is inferred that low water temperature may inhibit growth of phytoplankton and other microbes and so reduce competition for a common substrate, ammonium.

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Review

[MINIREVIEW]Regulation of gene expression by protein lysine acetylation in Salmonella: Hyojeong Koo , Shinae Park , Min-Kyu Kwak , Jung-Shin Lee; J. Microbiol. 2020;58(12):979-987. Published online November 17, 2020; DOI: https://doi.org/10.1007/s12275-020-0483-8

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Protein lysine acetylation influences many physiological functions, such as gene regulation, metabolism, and disease in eukaryotes. Although little is known about the role of lysine acetylation in bacteria, several reports have proposed its importance in various cellular processes. Here, we discussed the function of the protein lysine acetylation and the post-translational modifications (PTMs) of histone-like proteins in bacteria focusing on Salmonella pathogenicity. The protein lysine residue in Salmonella is acetylated by the Pat-mediated enzymatic pathway or by the acetyl phosphate-mediated non-enzymatic pathway. In Salmonella, the acetylation of lysine 102 and lysine 201 on PhoP inhibits its protein activity and DNAbinding, respectively. Lysine acetylation of the transcriptional regulator, HilD, also inhibits pathogenic gene expression. Moreover, it has been reported that the protein acetylation patterns significantly differ in the drug-resistant and -sensitive Salmonella strains. In addition, nucleoid-associated proteins such as histone-like nucleoid structuring protein (H-NS) are critical for the gene silencing in bacteria, and PTMs in H-NS also affect the gene expression. In this review, we suggest that protein lysine acetylation and the post-translational modifications of H-NS are important factors in understanding the regulation of gene expression responsible for pathogenicity in Salmonella.

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Hyojeong Koo, Eunna Choi, Shinae Park, Eun-Jin Lee, Jung-Shin Lee
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Journal Articles

Oecophyllibacter saccharovorans gen. nov. sp. nov., a bacterial symbiont of the weaver ant Oecophylla smaragdina: Kah-Ooi Chua , Wah-Seng See-Too , Jia-Yi Tan , Sze-Looi Song , Hoi-Sen Yong , Wai-Fong Yin , Kok-Gan Chan; J. Microbiol. 2020;58(12):988-997. Published online October 23, 2020; DOI: https://doi.org/10.1007/s12275-020-0325-8

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In this study, bacterial strains Ha5T, Ta1, and Jb2 were isolated from different colonies of weaver ant Oecophylla smaragdina. They were identified as bacterial symbionts of the ant belonging to family Acetobacteraceae and were distinguished as different strains based on distinctive random-amplified polymorphic DNA (RAPD) fingerprints. Cells of these bacterial strains were Gram-negative, rod-shaped, aerobic, non-motile, catalase-positive and oxidase-negative. They were able to grow at 15–37°C (optimum, 28–30°C) and in the presence of 0–1.5% (w/v) NaCl (optimum 0%). Their predominant cellular fatty acids were C18:1 ω7c, C16:0, C19:0 ω8c cyclo, C14:0, and C16:0 2-OH. Strains Ha5T, Ta1, and Jb2 shared highest 16S rRNA gene sequence similarity (94.56–94.63%) with Neokomagataea tanensis NBRC106556T of family Acetobacteraceae. Both 16S rRNA gene sequence-based phylogenetic analysis and core gene-based phylogenomic analysis placed them in a distinct lineage in family Acetobacteraceae. These bacterial strains shared higher than species level thresholds in multiple overall genome-relatedness indices which indicated that they belonged to the same species. In addition, they did not belong to any of the current taxa of Acetobacteraceae as they had low pairwise average nucleotide identity (< 71%), in silico DNA-DNA hybridization (< 38%) and average amino acid identity (< 67%) values with all the type members of the family. Based on these results, bacterial strains Ha5T, Ta1, and Jb2 represent a novel species of a novel genus in family Acetobacteraceae, for which we propose the name Oecophyllibacter saccharovorans gen. nov. sp. nov., and strain Ha5T as the type strain.

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Formicincola oecophyllae gen. nov. sp. nov., a novel member of the family Acetobacteraceae isolated from the weaver ant Oecophylla smaragdina
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Roles of Dhh1 RNA helicase in yeast filamentous growth: Analysis of N-terminal phosphorylation residues and ATPase domains: Eunji Lee , Daehee Jung , Jinmi Kim; J. Microbiol. 2020;58(10):853-858. Published online September 29, 2020; DOI: https://doi.org/10.1007/s12275-020-0431-7

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In yeast Saccharomyces cerevisiae, the Dhh1 protein, a member of the DEAD-box RNA helicase, stimulates Dcp2/Dcp1- mediated mRNA decapping and functions as a general translation repressor. Dhh1 also positively regulates translation of a selected set of mRNAs, including Ste12, a transcription factor for yeast mating and pseudohyphal growth. Given the diverse functions of Dhh1, we investigated whether the putative phosphorylation sites or the conserved motifs for the DEADbox RNA helicases were crucial in the regulatory roles of Dhh1 during pseudohyphal growth. Mutations in the ATPase A or B motif (DHH1-K96R or DHH1-D195A) showed significant defects in pseudohyphal colony morphology and agar invasive phenotypes. The N-terminal phospho-mimetic mutation, DHH1-T16E, showed defects in pseudohyphal phenotypes. Decreased levels of Ste12 protein were also observed in these pseudohyphal-defective mutant cells under filamentous- inducing low nitrogen conditions. We suggest that the ATPase motifs and the Thr16 phosphorylation site of Dhh1 are crucial to its regulatory roles in pseudohyphal growth under low nitrogen conditions.

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Microbial communities greatly affect rearing water quality and the larvae health during shrimp hatchery periods. In this study, we investigated the microbial communities of rearing water and larvae of Litopenaeus vannamei after treating hatchery water with different kinds of chemical disinfectants: no disinfectants (Con), chlorine dioxide (ClO2), formaldehyde solution (HCHO), bleach powder (CaClO), and iodine (I2). The water and larval samples were collected from nauplius 6 (N6), zoea 1 (Z1), mysis 1 (M1), and postlarvae 1 (P1) shrimp growth periods. 16S rDNA high-throughput sequencing revealed that the bacterial composition of the rearing water was more complex than that of the larvae, and the bacterial community of the rearing water and the larvae fluctuated significantly at the P1 and Z1 periods, respectively. Disinfectants altered the bacterial diversity and composition of the rearing water and larvae. Specifically, in the rearing water of the P1 period, Proteobacteria abundance was increased in the HCHO group; while Bacteroidetes abundance was decreased in the ClO2, HCHO, and I2 groups but increased in the CaClO group. In the larvae of the Z1 period, Firmicutes (especially Bacillus class) abundance was increased in the CaClO group, but decreased in the ClO2, HCHO, and I2 groups. Network analyses revealed that the genera Donghicola, Roseibacterium, Candidatus-Cquiluna, and Nautella were enriched in the rearing water, while Halomonas, Vibrio, and Flavirhabdus had high abundance in the larvae. The survival of shrimp was influenced by disinfectants that were inconsistent with the bacterial community changes. These results will be helpful for using microbial characteristics to facilitate healthy shrimp nursery.

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Metagenomic insights into the rapid recovery mechanisms of prokaryotic community and spread of antibiotic resistance genes after seawater disinfection
Jiaojiao Yan, Xinxu Zhang, Xinyong Shi, Jialin Wu, Ziang Zhou, Yawen Tang, Zhen Bao, Nan Luo, Demin Zhang, Jiong Chen, Huajun Zhang
Water Research.2025; 271: 122887. CrossRef
Divergence patterns of bacterial communities between larviculture systems of two Penaeus vannamei strains with distinct culture traits
Heng Chen, Fengdie Zhang, Junqi Yu, Rudan Chen, Demin Zhang, Chen Chen, Kai Wang
Aquaculture.2025; 606: 742572. CrossRef
The Impact of Tank Disinfectants on the Development of Microbiota in Gilthead Seabream (Sparus aurata) Larviculture Systems
Georgia Apostolopoulou, Naima Bel Mokhtar, Elias Asimakis, Eva Dionyssopoulou, Kosmas Toskas, George Koumoundouros, George Tsiamis, Panagiota Stathopoulou
Microorganisms.2025; 13(6): 1359. CrossRef
Comparative Microbiome Analysis of Artemia spp. and Potential Role of Microbiota in Cyst Hatching
Euihyeon Lee, Kyun-Woo Lee, Yeun Park, Ayeon Choi, Kae Kyoung Kwon, Hye-Min Kang
Marine Biotechnology.2024; 26(1): 50. CrossRef
Advances in 2D Materials Based Gas Sensors for Industrial Machine Olfactory Applications
Peng Wu, Yi Li, Aijun Yang, Xiangyu Tan, Jifeng Chu, Yifan Zhang, Yongxu Yan, Ju Tang, Hongye Yuan, Xiaoxing Zhang, Song Xiao
ACS Sensors.2024; 9(6): 2728. CrossRef
Effects of potassium monopersulfate on nitrification activity and bacterial community structure of sponge biocarrier biofilm in Litopenaeus vannamei aquaculture system
Yazhi Luan, Yang Wang, Chao Liu, Libin Lv, Ailing Xu, Zhiwen Song
Environmental Technology.2024; 45(17): 3354. CrossRef
Investigating the impact of chlorine dioxide in shrimp-rearing water on the stomach microbiome, gill transcriptome, and infection-related mortality in shrimp
Kentaro Imaizumi, Reiko Nozaki, Kayo Konishi, Hideaki Tagishi, Takanori Miura, Hidehiro Kondo, Ikuo Hirono
Journal of Applied Microbiology.2024;[Epub] CrossRef
Assessing the efficacy of bleaching powder in disinfecting marine water: Insights from the rapid recovery of microbiomes
Yawen Tang, Huajun Zhang, Jiaojiao Yan, Nan Luo, Xuezhi Fu, Xiaoyu Wu, Jialin Wu, Changjun Liu, Demin Zhang
Water Research.2023; 241: 120136. CrossRef
Stocking Density Effects on Pacific White Shrimp Litopenaeus vannamei Hatchery Performance in Algal-Bacterial Biofloc Systems
Hu-wei Chen, Da-chuan Sun, Wen-chang Liu, Shuang Li, Hong-xin Tan
North American Journal of Aquaculture.2023; 85(1): 3. CrossRef

Review

[MINIREVIEW]Bacterial bug-out bags: outer membrane vesicles and their proteins and functions: Kesavan Dineshkumar , Vasudevan Aparna , Liang Wu , Jie Wan , Mohamod Hamed Abdelaziz , Zhaoliang Su , Shengjun Wang , Huaxi Xu; J. Microbiol. 2020;58(7):531-542. Published online June 10, 2020; DOI: https://doi.org/10.1007/s12275-020-0026-3

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Among the major bacterial secretions, outer membrane vesicles (OMVs) are significant and highly functional. The proteins and other biomolecules identified within OMVs provide new insights into the possible functions of OMVs in bacteria. OMVs are rich in proteins, nucleic acids, toxins and virulence factors that play a critical role in bacteria-host interactions. In this review, we discuss some proteins with multifunctional features from bacterial OMVs and their role involving the mechanisms of bacterial survival and defence. Proteins with moonlighting activities in OMVs are discussed based on their functions in bacteria. OMVs harbour many other proteins that are important, such as proteins involved in virulence, defence, and competition. Overall, OMVs are a power-packed aid for bacteria, harbouring many defensive and moonlighting proteins and acting as a survival kit in
case
of an emergency or as a defence weapon. In summary, OMVs can be defined as bug-out bags for bacterial defence and, therefore, survival.

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Mariana Ottaiano Gonçalves, Paula Maria Pincela Lins, Giulia Kassab, Vanderlei Bagnato, Valtencir Zucolotto
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International Journal of Molecular Sciences.2022; 23(23): 15248. CrossRef
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Journal Articles

Ciceribacter ferrooxidans sp. nov., a nitrate-reducing Fe(II)-oxidizing bacterium isolated from ferrous ion-rich sediment: Tongchu Deng , Youfen Qian , Xingjuan Chen , Xunan Yang , Jun Guo , Guoping Sun , Meiying Xu; J. Microbiol. 2020;58(5):350-356. Published online April 27, 2020; DOI: https://doi.org/10.1007/s12275-020-9471-2

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A nitrate-reducing Fe(II)-oxidizing bacterial strain, F8825T, was isolated from the Fe(II)-rich sediment of an urban creek in Pearl River Delta, China. The strain was Gram-negative, facultative chemolithotrophic, facultative anaerobic, nonspore- forming, and rod-shaped with a single flagellum. Phylogenetic analysis based on 16S rRNA gene sequencing indicated that it belongs to the genus Ciceribacter and is most closely related to C. lividus MSSRFBL1T (99.4%), followed by C. thiooxidans F43bT (98.8%) and C. azotifigens A.slu09T (98.0%). Fatty acid, polar lipid, respiratory quinone, and DNA G + C content analyses supported its classification in the genus Ciceribacter. Multilocus sequence analysis of concatenated 16S rRNA, atpD, glnII, gyrB, recA, and thrC suggested that the isolate was a novel species. DNA–DNA hybridization and genome sequence comparisons (90.88 and 89.86%, for values of ANIm and ANIb between strains F8825T with MSSRFBL1T, respectively) confirmed that strain F8825T was a novel species, different from C. lividus MSSRFBL1T, C. thiooxidans F43bT, and C. azotifigens A.slu09T. The physiological and biochemical properties of the strain, such as carbon source utilization, nitrate reduction, and ferrous ion oxidation, further supported that this is a novel species. Based on the polyphasic taxonomic results, strain F8825T was identified as a novel species in the genus Ciceribacter, for which the name Ciceribacter ferrooxidans sp. nov. is proposed. The type strain is F8825T (= CCTCC AB 2018196T = KCTC 62948T).

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Oryzifoliimicrobium ureilyticus gen. nov., sp. nov., a Novel Phosphate-Solubilizing and Siderophore-Producing Bacterium Within the Family Rhizobiaceae
Guo-Hong Liu, Ling Yao, Peng Gao, Shu-Qun Zhang, Bing Li, Christopher Rensing, Wen-Qing Li, Shun-Gui Zhou
Current Microbiology.2025;[Epub] CrossRef
Biological denitrification performance of a novel sulfur-slow-release carbon source mixed filler
Zhen Peng, Hang Shi, Shengkai Wu, Yao Fan, Xu Ye, Qisong Liu, Bo Liu
Journal of Water Process Engineering.2024; 62: 105257. CrossRef
Pathways and contributions of sulfate reducing-bacteria to arsenic cycling in landfills
Lifang Hu, Feng Huang, Yating Qian, Tao Ding, Yuzhou Yang, Dongsheng Shen, Yuyang Long
Journal of Hazardous Materials.2024; 473: 134582. CrossRef
Ciceribacter sichuanensis sp. nov., a plant growth promoting rhizobacterium isolated from root nodules of soybean in Sichuan, China
Yanqin Zhang, Yuanxue Chen, Petri Penttinen, Xing Wang, Ying Quan, Licheng Wen, Miao Yang, Xiaoping Zhang, Qiang Chen, Lingzi Zhang, Junjie Zhang, Xiaoxia Zhang, Kaiwei Xu
Antonie van Leeuwenhoek.2024;[Epub] CrossRef
Genomic Insights into the Landfill Microbial Community: Denitrifying Activity Supporting One-Carbon Utilization
Bhagyashri J. Poddar, Anshuman A. Khardenavis
Applied Biochemistry and Biotechnology.2024; 196(12): 8866. CrossRef
Sediment-isolated Comamonas terrigena strain HJ-2: a novel nitrate-dependent ferrous-oxidizing bacterium with multifunction on pollutant transformation
Rong Peng, Junhao Shen, Shuang Li, Hui Liu
Letters in Applied Microbiology.2023;[Epub] CrossRef
New Anaerobic Iron-Cycling Bacteria Isolated from the Yessentukskoye Mineral Water Deposit
D. G. Zavarzina, V. A. Pikhtereva, A. A. Klyukina, A. Yu. Merkel, S. N. Gavrilov
Microbiology.2023; 92(S1): S12. CrossRef
Genomic characterization of denitrifying methylotrophic Pseudomonas aeruginosa strain AAK/M5 isolated from municipal solid waste landfill soil
Ashish Kumar Singh, Rakesh Kumar Gupta, Hemant J. Purohit, Anshuman Arun Khardenavis
World Journal of Microbiology and Biotechnology.2022;[Epub] CrossRef
International Committee on Systematics of Prokaryotes, Subcommittee on the taxonomy of Rhizobia and Agrobacteria, minutes of the annual meeting by videoconference, 5 July 2021, followed by online discussion until 31 December 2021
Seyed Abdollah Mousavi, J. Peter W. Young
International Journal of Systematic and Evolutionary Microbiology.2022;[Epub] CrossRef

Sequence analysis of the first B5 subgenogroup strain of enterovirus 71 isolated in Korea: Yu Jung Won , Lae Hyung Kang , Ah Ra Lee , Bomina Paik , Hyun Kim , Sung Geun Lee , Seung Won Park , Seung Jin Hong , Soon Young Paik; J. Microbiol. 2020;58(5):422-429. Published online March 28, 2020; DOI: https://doi.org/10.1007/s12275-020-9539-z

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Abstract PDF: Enterovirus A71 (EV71), the main etiological agent of handfoot- mouth disease (HFMD), circulates in many areas of the world and has caused large epidemics since 1997, especially in the Asia-Pacific region. In this study, we determined the full-genome sequence of CMC718, a newly isolated EV71 strain in Korea. The CMC718 genome was 7,415 nucleotides in length and was confirmed by whole-genome phylogenetic analysis to belong to the B5 genotype. In particular, CMC718 demonstrated maximum identity with strain M988 of the B5 genotype and numerous amino acid variants were detected in the 3D domain of the viral protein P3, which is consistent with the mutation pattern of a B5 strain isolated in 2012–2013. Comparison of the CMC718 sequence with other EV71 reference strains confirmed the relationship and genetic variation of CMC718. Our study was a full-genome sequence analysis of the first EV71 strain of the B5 genotype isolated in South Korea. This information will be a valuable reference for the development of methods for the detection of recombinant viruses, the tracking of infections, and the diagnosis of EV71.

Setup of a scientific computing environment for computational biology: Simulation of a genome-scale metabolic model of Escherichia coli as an example: Junhyeok Jeon , Hyun Uk Kim; J. Microbiol. 2020;58(3):227-234. Published online February 27, 2020; DOI: https://doi.org/10.1007/s12275-020-9516-6

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Computational analysis of biological data is becoming increasingly important, especially in this era of big data. Computational analysis of biological data allows efficiently deriving biological insights for given data, and sometimes even counterintuitive ones that may challenge the existing knowledge. Among experimental researchers without any prior exposure to computer programming, computational analysis of biological data has often been considered to be a task reserved for computational biologists. However, thanks to the increasing availability of user-friendly computational resources, experimental researchers can now easily access computational resources, including a scientific computing environment and packages necessary for data analysis. In this regard, we here describe the process of accessing Jupyter Notebook, the most popular Python coding environment, to conduct computational biology. Python is currently a mainstream programming language for biology and biotechnology. In particular, Anaconda and Google Colaboratory are introduced as two representative options to easily launch Jupyter Notebook. Finally, a Python package COBRApy is demonstrated as an example to simulate 1) specific growth rate of Escherichia coli as well as compounds consumed or generated under a minimal medium with glucose as a sole carbon source, and 2) theoretical production yield of succinic acid, an industrially important chemical, using E. coli. This protocol should serve as a guide for further extended computational analyses of biological data for experimental researchers without computational background.

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The Application of Web‐Based Scientific Computing System in Innovation and Entrepreneurship
Tingli Cheng, Lele Qin
Discrete Dynamics in Nature and Society.2022;[Epub] CrossRef
Numerical Analysis and Scientific Calculation Considering the Management Mechanism of College Students’ Innovation and Entrepreneurship Education
Sheng Wang, Xiantao Jiang
Mathematical Problems in Engineering.2022; 2022: 1. CrossRef
Omics-based microbiome analysis in microbial ecology: from sequences to information
Jang-Cheon Cho
Journal of Microbiology.2021; 59(3): 229. CrossRef
Genome-Scale Metabolic Modeling Enables In-Depth Understanding of Big Data
Anurag Passi, Juan D. Tibocha-Bonilla, Manish Kumar, Diego Tec-Campos, Karsten Zengler, Cristal Zuniga
Metabolites.2021; 12(1): 14. CrossRef
User guides for biologists to learn computational methods
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Journal of Microbiology.2020; 58(3): 173. CrossRef

Natronorubrum halophilum sp. nov. isolated from two inland salt lakes: Cong-Qi Tao , Yi Ding , Yang-Jie Zhao , Heng-Lin Cui; J. Microbiol. 2020;58(2):105-112. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9514-8

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Two halophilic archaeal strains, SHR37T and NEN6, were isolated from salt lakes located in the Tibet and Xinjiang regions of China. The two strains were found to form a single cluster (99.9% and 99.3% similarity, respectively) separating them from the six current members of Natronorubrum (94.7– 96.9% and 86.1–90.8% similarity, respectively) on the basis of the 16S rRNA and rpoB􍿁 gene sequence similarities and phylogenetic analysis. Diverse phenotypic characteristics differentiate strains SHR37T and NEN6 from current Natronorubrum members. Their polar lipids are C20C20 and C20C25 glycerol diether derivatives of PG, PGP-Me, and a major glycolipid chromatographically identical to disulfated mannosyl glucosyl diether (S2-DGD). Four minor unidentified glycolipids are also present. The OrthoANI and in silico DDH values of the two strains were 97.3% and 76.1%, respectively, which were much higher than the threshold values proposed as a species boundary (ANI 95–96% and in silico DDH 70%), which revealed that the two strains represent one species; the two values (ANI 79.0–81.9% and in silico DDH 23.5– 25.7%) of the strains examined in this study and the current members of Natronorubrum are much lower than the recommended threshold values, suggesting that strains SHR37T and NEN6 represent a genomically different species of Natronorubrum. These results showed that strains SHR37T (= CGMCC 1.15233T = JCM 30845T) and NEN6 (= CGMCC 1.17161) represent a novel species of Natronorubrum, for which the name Natronorubrum halophilum sp. nov. is proposed.

Citations

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Natronorubrum marinum sp. nov., Natronorubrum amylolyticum sp. nov., Natronorubrum halobium sp. nov., and Natronorubrum salinum sp. nov., halophilic archaea from a coastal saline-alkali land and two saline lakes
Ya-Ling Mao, Yao Hu, Zhang-Ping Wu, Ya-Ping Sun, Jing Hou, Heng-Lin Cui
Systematic and Applied Microbiology.2026; 49(1): 126680. CrossRef
Halobellus marinus sp. nov., Halobellus ordinarius sp. nov., Halobaculum rarum sp. nov., and Halorarum halobium sp. nov., halophilic archaea isolated from marine solar salt and a saline lake
Ling-Rui Zhu, Chidiebele Nwankwo, Jing Hou, Heng-Lin Cui
Extremophiles.2025;[Epub] CrossRef
Identification of Roseomonas xinghualingensis sp. nov. isolated from hospital air
Zhiming Kang, Wenjing Lei, Ji Pu, Lijun Zhao, Guowen Min, Yufeng Liu, Wenjuan Chang, Yuqian Gao, Kui Dong, Bin Sun
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Genome-Based Reclassification of Two Haloarcula Species and Characterization of Haloarcula montana sp. nov.
Ji-Qiang Liu, Ling-Rui Zhu, Ya-Ling Mao, Xue Ma, Jing Hou
Biology.2025; 14(6): 615. CrossRef
Haloalkaliphilic Archaea as Sources of Carotenoids: Ecological Distribution, Biosynthesis and Therapeutic Applications
Anjali Desai, Sanket Ray
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Genome-based taxonomy of genera Haloarcula and Halomicroarcula, and description of six novel species of Haloarcula
Xue Ma, Yao Hu, Xin-Xin Li, Shun Tan, Mu Cheng, Jing Hou, Heng-Lin Cui
Extremophiles.2024;[Epub] CrossRef
Genome-based classification of the family Haloferacaceae and description of five novel species of Halobaculum
Shun Tan, Ling-Rui Zhu, Qing-Ke Zhang, Xin-Yue Dong, Jing Hou, Heng-Lin Cui
Extremophiles.2024;[Epub] CrossRef
Halobacterium yunchengense sp. nov., Natronomonas amylolytica sp. nov., Halorientalis halophila sp. nov., Halobellus salinisoli sp. nov., halophilic archaea isolated from a saline lake and inland saline soil
Ling Cui, Yao Hu, Xin-Xin Li, Xue Ma, Mu Cheng, Shun Tan, Jing Hou, Heng-Lin Cui
Extremophiles.2024;[Epub] CrossRef
Prokaryotic Community Structure, Abundances, and Potential Ecological Functions in a Mars Analog Salt Lake
Wenqi Cai, Ke Yu, Wanting Yang, Rong Mu, Chunang Lian, Luhua Xie, Yan Yan, Shibin Liao, Fan Wang
Astrobiology.2023; 23(5): 550. CrossRef
Halocatena marina sp. nov., a novel filamentous halophilic archaeon isolated from marine tidal flat and emended description of the genus Halocatena
Zhang-Ping Wu, Xi-Wen Zheng, Ya-Ping Sun, Bei-Bei Wang, Jing Hou, Heng-Lin Cui
Extremophiles.2023;[Epub] CrossRef
Halomicroarcula laminariae sp. nov. and Halomicroarcula marina sp. nov., extremely halophilic archaea isolated from salted brown alga Laminaria and coastal saline-alkali lands
Xue Ma, Yao Hu, Xin-Xin Li, Shun Tan, Mu Cheng, Jing Hou, Heng-Lin Cui
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Natrinema caseinilyticum sp. nov., Natrinema gelatinilyticum sp. nov., Natrinema marinum sp. nov., Natrinema zhouii sp. nov., extremely halophilic archaea isolated from marine environments and a salt mine
Yao Hu, Xue Ma, Xin-Xin Li, Shun Tan, Mu Cheng, Jing Hou, Heng-Lin Cui
Extremophiles.2023;[Epub] CrossRef
Halobacterium wangiae sp. nov. and Halobacterium zhouii sp. nov., two extremely halophilic archaea isolated from sediment of a salt lake and saline soil of an inland saltern
Bei-Bei Wang, Chen-Xi Bao, Ya-Ping Sun, Jing Hou, Heng-Lin Cui
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Halocatena salina sp. nov., a filamentous halophilic archaeon isolated from Aiding Salt Lake
Zhang-Ping Wu, Xi-Wen Zheng, Ya-Ping Sun, Bei-Bei Wang, Jing Hou, Heng-Lin Cui
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Correlating bacterial and archaeal community with efficiency of a coking wastewater treatment plant employing anaerobic-anoxic-oxic process in coal industry
Qiaoying Ban, Liguo Zhang, Jianzheng Li
Chemosphere.2022; 286: 131724. CrossRef
Isolation and characterization of tick-borne Roseomonas haemaphysalidis sp. nov. and rodent-borne Roseomonas marmotae sp. nov.
Wentao Zhu, Juan Zhou, Shan Lu, Jing Yang, Xin-He Lai, Dong Jin, Ji Pu, Yuyuan Huang, Liyun Liu, Zhenjun Li, Jianguo Xu
Journal of Microbiology.2022; 60(2): 137. CrossRef
Haloprofundus salilacus sp. nov., Haloprofundus halobius sp. nov. and Haloprofundus salinisoli sp. nov.: three extremely halophilic archaea isolated from salt lake and saline soil
Si-Ya Li, Yu-Jie Xin, Chen-Xi Bao, Jing Hou, Heng-Lin Cui
Extremophiles.2022;[Epub] CrossRef
Natronorubrum halalkaliphilum sp. nov., a haloalkaliphilic archaeon isolated from soda lake in Inner Mongolia Autonomous Region, China
Qiong Xue, Dahe Zhao, Zhenqiang Zuo, Jian Zhou, Hua Xiang
Archives of Microbiology.2021; 203(5): 2335. CrossRef
Phylogenomics of Haloarchaea: The Controversy of the Genera Natrinema-Haloterrigena
Rafael R. de la Haba, Hiroaki Minegishi, Masahiro Kamekura, Yasuhiro Shimane, Antonio Ventosa
Frontiers in Microbiology.2021;[Epub] CrossRef
Salinadaptatus halalkaliphilus gen. nov., sp. nov., a haloalkaliphilic archaeon isolated from salt pond in Inner Mongolia Autonomous Region, China
Qiong Xue, Zhenqiang Zuo, Heng Zhou, Jian Zhou, Shengjie Zhang, Jing Han, Dahe Zhao, Hua Xiang
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Cultivation of halophilic archaea (class Halobacteria) from thalassohaline and athalassohaline environments
Heng-Lin Cui, Mike L. Dyall-Smith
Marine Life Science & Technology.2021; 3(2): 243. CrossRef
List of new names and new combinations previously effectively, but not validly, published
Aharon Oren, George M. Garrity
International Journal of Systematic and Evolutionary Microbiology.2020; 70(5): 2960. CrossRef

Comparative genomic analysis of selenium utilization traits in different marine environments: Muhammad Farukh; J. Microbiol. 2020;58(2):113-122. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9250-0

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Selenium (Se) is an essential trace element for many organisms, which is required in the biosynthesis of proteins with selenocysteine, tRNAs with selenouridine, and certain enzymes with Se as a cofactor. Recent large-scale metagenomics projects provide a unique opportunity for studying the global trends of Se utilization in marine environments. Here, we analyzed samples from different marine microbial communities, revealed by the Tara Oceans project, to characterize the Se utilization traits. We found that the selenophosphate synthetase gene, which defines the overall Se utilization, and Se utilization traits are present in all samples. Regions with samples rich and poor in Se utilization traits were categorized. From the analysis of environmental factors, the mesopelagic zone and high temperature (> 15°C) of water are favorable, while geographical location has little influence on Se utilization. All Se utilization traits showed a relatively independent occurrence. The taxonomic classification of Se traits shows that most of the sequences corresponding to Se utilization traits belong to the phylum Proteobacteria. Overall, our study provides useful insights into the general features of Se utilization in ocean samples and may help to understand the evolutionary dynamics of Se utilization in different marine environments.

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The selenophosphate synthetase family: A review
Bruno Manta, Nadezhda E Makarova, Marco Mariotti
Free Radical Biology and Medicine.2022; 192: 63. CrossRef
Selenium Metabolism and Selenoproteins in Prokaryotes: A Bioinformatics Perspective
Yan Zhang, Jiao Jin, Biyan Huang, Huimin Ying, Jie He, Liang Jiang
Biomolecules.2022; 12(7): 917. CrossRef
Uses of Selenium Nanoparticles in the Plant Production
Iqra Bano, Sylvie Skalickova, Hira Sajjad, Jiri Skladanka, Pavel Horky
Agronomy.2021; 11(11): 2229. CrossRef

Reviews

[Minireview]Recent advances in genetic engineering tools based on synthetic biology: Jun Ren , Jingyu Lee , Dokyun Na; J. Microbiol. 2020;58(1):1-10. Published online January 2, 2020; DOI: https://doi.org/10.1007/s12275-020-9334-x

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Genome-scale engineering is a crucial methodology to rationally regulate microbiological system operations, leading to expected biological behaviors or enhanced bioproduct yields. Over the past decade, innovative genome modification technologies have been developed for effectively regulating and manipulating genes at the genome level. Here, we discuss the current genome-scale engineering technologies used for microbial engineering. Recently developed strategies, such as clustered regularly interspaced short palindromic repeats (CRISPR)-Cas9, multiplex automated genome engineering (MAGE), promoter engineering, CRISPR-based regulations, and synthetic small regulatory RNA (sRNA)-based knockdown, are considered as powerful tools for genome-scale engineering in microbiological systems. MAGE, which modifies specific nucleotides of the genome sequence, is utilized as a genome-editing tool. Contrastingly, synthetic sRNA, CRISPRi, and CRISPRa are mainly used to regulate gene expression without modifying the genome sequence. This review introduces the recent genome-scale editing and regulating technologies and their applications in metabolic engineering.

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Functional interplay between the oxidative stress response and DNA damage checkpoint signaling for genome maintenance in aerobic organisms: Ji Eun Choi , Woo-Hyun Chung; J. Microbiol. 2020;58(2):81-91. Published online December 23, 2019; DOI: https://doi.org/10.1007/s12275-020-9520-x

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The DNA damage checkpoint signaling pathway is a highly conserved surveillance mechanism that ensures genome integrity by sequential activation of protein kinase cascades. In mammals, the main pathway is orchestrated by two central sensor kinases, ATM and ATR, that are activated in response to DNA damage and DNA replication stress. Patients lacking functional ATM or ATR suffer from ataxia-telangiectasia (A-T) or Seckel syndrome, respectively, with pleiotropic degenerative phenotypes. In addition to DNA strand breaks, ATM and ATR also respond to oxidative DNA damage and reactive oxygen species (ROS), suggesting an unconventional function as regulators of intracellular redox status. Here, we summarize the multiple roles of ATM and ATR, and of their orthologs in Saccharomyces cerevisiae, Tel1 and Mec1, in DNA damage checkpoint signaling and the oxidative stress response, and discuss emerging ideas regarding the possible mechanisms underlying the elaborate crosstalk between those pathways. This review may provide new insights into the integrated cellular strategies responsible for maintaining genome stability in eukaryotes with a focus on the yeast model organism.

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The discovery of potent immunostimulatory CpG-ODNs widely distributed in bacterial genomes: Juan Liu , Yan Wei , Yongling Lu , Yangyuling Li , Qian Chen , Yan Li; J. Microbiol. 2020;58(2):153-162. Published online December 23, 2019; DOI: https://doi.org/10.1007/s12275-020-9289-y

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Oligodeoxynucleotides containing unmethylated CpG dinucleotides (CpG-ODN) can be specifically recognized by Toll-like receptor 9 (TLR9), provoking innate immune responses. Designed according to this structural feature, many synthetic phosphorothioate CpG-ODNs successfully activate macrophages. However, it is difficult to find potent stimulatory CpG-DNA fragments in microbial genomes. Therefore, whether microbial CpG-DNA substantially contributes to infectious and immune diseases remains controversial. In this study, high-throughput scanning was carried out for thousands of bacterial genomes with bioinformatics tools to comprehensively evaluate the distribution of CpG-DNA fragments. A random sampling test was then performed to verify their immunostimulatory properties by experiments in vitro and in vivo. Natural TLR9-dependent and potent stimulatory CpG-DNA fragments were found in microbial genomes. Interestingly, highly conserved stimulatory CpG-DNA fragments were found in 16S and 23S rDNA sequences with multiple copies, while others were species-specific. Additionally, we found that the reported active motifs were mostly nonstimulatory in natural CpG fragments. This evidence indicates that the previous structural descriptions of functional CpG-ODNs are incomplete. Our study has assessed the distribution of microbial CpG-DNA fragments, and identified natural stimulatory CpG-DNA fragments. These findings provide a deeper understanding of CpG-ODN structures and new evidence for microbial DNA inflammatory function and pathogenicity.

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Advances in protein subunit vaccines against H1N1/09 influenza
Yu Zhang, Jingyao Gao, Wenqi Xu, Xingyu Huo, Jingyan Wang, Yirui Xu, Wenting Ding, Zeliang Guo, Rongzeng Liu
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Saccharibacillus brassicae sp. nov., an endophytic bacterium isolated from kimchi cabbage (Brassica rapa subsp. pekinensis) seeds: Lingmin Jiang , Chan Ju Lim , Song-Gun Kim , Jae Cheol Jeong , Cha Young Kim , Dae-Hyuk Kim , Suk Weon Kim , Jiyoung Lee; J. Microbiol. 2020;58(1):24-29. Published online November 25, 2019; DOI: https://doi.org/10.1007/s12275-020-9346-6

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Abstract PDF

Strain ATSA2T was isolated from surface-sterilized kimchi cabbage (Brassica rapa subsp. pekinensis) seeds and represents a novel bacterium based on the polyphasic taxonomic approach. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ATSA2T formed a lineage within genus Saccharibacillus and was most closely to Saccharibacillus deserti WLG055T (98.1%) and Saccharibacillus qingshengii H6T (97.9%). The whole-genome of ATSA2T comprised a 5,619,468 bp of circular chromosome with 58.4% G + C content. The DNA-DNA relatedness values between strain ATSA2T and its closely related type strains S. deserti WLJ055T and S. qingshengii H6T were 26.0% and 24.0%, respectively. Multiple gene clusters associated with plant growth promotion activities (stress response, nitrogen and phosphorus metabolism, and auxin biosynthesis) were annotated in the genome. Strain ATSA2T was Gram-positive, endospore-forming, facultatively anaerobic, and rod-shaped. It grew at 15–37°C (optimum 25°C), pH 6.0–10.0 (optimum pH 8.0), and in the presence of 0–5% (w/v) NaCl (optimum 1%). The major cellular fatty acids (> 10%) of strain ATSA2T were anteiso- C15:0 and C16:0. MK-7 was the major isoprenoid quinone. The major polar lipids present were diphosphatidylglycerol, phosphatidylglycerol, and three unknown glycolipids. Based on its phylogenetic, genomic, phenotypic, and chemotaxonomic features, strain ATSA2T is proposed to represent a novel species of genus Saccharibacillus, for which the name is Saccharibacillus brassicae sp. nov. The type strain is ATSA2T (KCTC 43072T = CCTCC AB 2019223T).

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Yuxin Peng, Dong Hyun Cho, Zalfa Humaira, Yu Lim Park, Ki Hyun Kim, Cha Young Kim, Jiyoung Lee
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Yue Jiang, Yong Guan, Sungmo Kang, Mi-Kyung Lee, Ki-Hyun Kim, Zhun Li
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Genome insights into the plant growth-promoting bacterium Saccharibacillus brassicae ATSA2T
Lingmin Jiang, Jiyoon Seo, Yuxin Peng, Doeun Jeon, Soon Ju Park, Cha Young Kim, Pyoung Il Kim, Chul Hong Kim, Ju Huck Lee, Jiyoung Lee
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Hyun-Sun Baek, Yong Guan, Min-Ju Kim, Yue Jiang, Mi-Kyung Lee, Ki-Hyun Kim, Jaeyoon Lee, Yuna Shin, Yoon-Ho Kang, Zhun Li
Antonie van Leeuwenhoek.2023; 116(12): 1317. CrossRef
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Yue Jiang, Zhun Li
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Gymnodinialimonas phycosphaerae sp. nov., a phycosphere bacterium isolated from Karlodinium veneficum
Yuxin Peng, Lingmin Jiang, Yue Jiang, Jiyoon Seo, Doeun Jeon, Young-Min Kim, Zhun Li, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Flavobacterium endoglycinae sp. nov., an endophytic bacterium isolated from soybean (Glycine max L. cv. Gwangan) stems
Jiyoon Seo, Yuxin Peng, Lingmin Jiang, Sang-Beom Lee, Rae-Dong Jeong, Soon Ju Park, Cha Young Kim, Man-Soo Choi, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
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H2 Metabolism revealed by metagenomic analysis of subglacial sediment from East Antarctica: Zhifeng Yang , Yu Zhang , Yongxin Lv , Wenkai Yan , Xiang Xiao , Bo Sun , Hongmei Ma; J. Microbiol. 2019;57(12):1095-1104. Published online November 22, 2019; DOI: https://doi.org/10.1007/s12275-019-9366-2

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Subglacial ecosystems harbor diverse chemoautotrophic microbial communities in areas with limited organic carbon, and lithological H2 produced during glacial erosion has been considered an important energy source in these ecosystems. To verify the H2-utilizing potential there and to identify the related energy-converting metabolic mechanisms of these communities, we performed metagenomic analysis on subglacial sediment samples from East Antarctica with and without H2 supplementation. Genes coding for several [NiFe]- hydrogenases were identified in raw sediment and were enriched after H2 incubation. All genes in the dissimilatory nitrate reduction and denitrification pathways were detected in the subglacial community, and the genes coding for these pathways became enriched after H2 was supplied. Similarly, genes transcribing key enzymes in the Calvin cycle were detected in raw sediment and were also enriched. Moreover, key genes involved in H2 oxidization, nitrate reduction, oxidative phosphorylation, and the Calvin cycle were identified within one metagenome-assembled genome belonging to a Polaromonas sp. As suggested by our results, the microbial community in the subglacial environment we investigated consisted of chemoautotrophic populations supported by H2 oxidation. These results further confirm the importance of H2 in the cryosphere.

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