Journal of Microbiology

Journal Articles

An Optimized Method for Reconstruction of Transcriptional Regulatory Networks in Bacteria Using ChIP-exo and RNA-seq Datasets: Minchang Jang, Joon Young Park, Gayeon Lee, Donghyuk Kim; J. Microbiol. 2024;62(12):1075-1088. Published online November 11, 2024; DOI: https://doi.org/10.1007/s12275-024-00181-6

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Transcriptional regulatory networks (TRNs) in bacteria are crucial for elucidating the mechanisms that regulate gene expression and cellular responses to environmental stimuli. These networks delineate the interactions between transcription factors (TFs) and their target genes, thereby uncovering the regulatory processes that modulate gene expression under varying environmental conditions. Analyzing TRNs offers valuable insights into bacterial adaptation, stress responses, and metabolic optimization from an evolutionary standpoint. Additionally, understanding TRNs can drive the development of novel antimicrobial therapies and the engineering of microbial strains for biofuel and bioproduct production. This protocol integrates advanced data analysis pipelines, including ChEAP, DEOCSU, and DESeq2, to analyze omics datasets that encompass genome-wide TF binding sites and transcriptome profiles derived from ChIP-exo and RNA-seq experiments. This approach minimizes both the time required and the risk of bias, making it accessible to non-expert users. Key steps in the protocol include preprocessing and peak calling from ChIP-exo data, differential expression analysis of RNA-seq data, and motif and regulon analysis. This method offers a comprehensive and efficient framework for TRN reconstruction across various bacterial strains, enhancing both the accuracy and reliability of the analysis while providing valuable insights for basic and applied research.

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ChIP-mini: a low-input ChIP-exo protocol for elucidating DNA-binding protein dynamics in intracellular pathogens
Joon Young Park, Minchang Jang, Eunna Choi, Sang-Mok Lee, Ina Bang, Jihoon Woo, Seonggyu Kim, Eun-Jin Lee, Donghyuk Kim
Nucleic Acids Research.2025;[Epub] CrossRef

Unexpected Requirement of Small Amino Acids at Position 183 for DNA Binding in the Escherichia coli cAMP Receptor Protein: Marcus Carranza, Amanda Rea, Daisy Pacheco, Christian Montiel, Jin Park, Hwan Youn; J. Microbiol. 2024;62(10):871-882. Published online September 6, 2024; DOI: https://doi.org/10.1007/s12275-024-00169-2

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Abstract

The Escherichia coli cAMP receptor protein (CRP) relies on the F-helix, the recognition helix of the helix-turn-helix motif, for DNA binding. The importance of the CRP F-helix in DNA binding is well-established, yet there is little information on the roles of its non-base-contacting residues. Here, we show that a CRP F-helix position occupied by a non-base-contacting residue Val183 bears an unexpected importance in DNA binding. Codon randomization and successive in vivo screening selected six amino acids (alanine, cysteine, glycine, serine, threonine, and valine) at CRP position 183 to be compatible with DNA binding. These amino acids are quite different in their amino acid properties (polar, non-polar, hydrophobicity), but one commonality is that they are all relatively small. Larger amino acid substitutions such as histidine, methionine, and tyrosine were made site-directedly and showed to have no detectable DNA binding, further supporting the requirement of small amino acids at CRP position 183. Bioinformatics analysis revealed that small amino acids (92.15% valine and 7.75% alanine) exclusively occupy the position analogous to CRP Val183 in 1,007 core CRP homologs, consistent with our mutant data. However, in extended CRP homologs comprising 3700 proteins, larger amino acids could also occupy the position analogous to CRP Val183 albeit with low occurrence. Another bioinformatics analysis suggested that large amino acids could be tolerated by compensatory small-sized amino acids at their neighboring positions. A full understanding of the unexpected requirement of small amino acids at CRP position 183 for DNA binding entails the verification of the hypothesized compensatory change(s) in CRP.

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SPD_0410 negatively regulates capsule polysaccharide synthesis and virulence in Streptococcus pneumoniae D39
Ye Tao, Li Lei, Shuhui Wang, Xuemei Zhang, Yibing Yin, Yuqiang Zheng
Frontiers in Microbiology.2025;[Epub] CrossRef

Mycobacterium tuberculosis PE_PGRS45 (Rv2615c) Promotes Recombinant Mycobacteria Intracellular Survival via Regulation of Innate Immunity, and Inhibition of Cell Apoptosis: Tao Xu , Chutong Wang , Minying Li , Jing Wei , Zixuan He , Zhongqing Qian , Xiaojing Wang , Hongtao Wang; J. Microbiol. 2024;62(1):49-62. Published online February 9, 2024; DOI: https://doi.org/10.1007/s12275-023-00101-0

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Abstract

Tuberculosis (TB), a bacterial infectious disease caused by Mycobacterium tuberculosis (M. tuberculosis), is a significant global public health problem. Mycobacterium tuberculosis expresses a unique family of PE_PGRS proteins that have been implicated in pathogenesis. Despite numerous studies, the functions of most PE_PGRS proteins in the pathogenesis of mycobacterium infections remain unclear. PE_PGRS45 (Rv2615c) is only found in pathogenic mycobacteria. In this study, we successfully constructed a recombinant Mycobacterium smegmatis (M. smegmatis) strain which heterologously expresses the PE_PGRS45 protein. We found that overexpression of this cell wall-associated protein enhanced bacterial viability under stress in vitro and cell survival in macrophages. MS_PE_PGRS45 decreased the secretion of pro-inflammatory cytokines such as IL-1β, IL-6, IL-12p40, and TNF-α. We also found that MS_PE_PGRS45 increased the expression of the anti-inflammatory cytokine IL-10 and altered macrophage-mediated immune responses. Furthermore, PE_PGRS45 enhanced the survival rate of M. smegmatis in macrophages by inhibiting cell apoptosis. Collectively, our findings show that PE_PGRS45 is a virulent factor actively involved in the interaction with the host macrophage.

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Evolution of the PE_PGRS Proteins of Mycobacteria: Are All Equal or Are Some More Equal than Others?
Bei Chen, Belmin Bajramović, Bastienne Vriesendorp, Herman Pieter Spaink
Biology.2025; 14(3): 247. CrossRef
Recent advances in research on Mycobacterium tuberculosis virulence factors and their role in pathogenesis
Ming-Rui Sun, Jia-Yin Xing, Xiao-Tian Li, Ren Fang, Yang Zhang, Zhao-Li Li, Ning-Ning Song
Journal of Microbiology, Immunology and Infection.2025;[Epub] CrossRef
Rv2741 Promotes Mycobacterium Survival by Modulating Macrophage Function via the IL-1α-MAPK Axis
Xintong He, Yonglin He, Xichuan Deng, Nan Lu, Anlong Li, Sijia Gao, Shiyan He, Yuran Wang, Nanzhe Fu, Zijie Wang, Yuxin Nie, Lei Xu
ACS Infectious Diseases.2025; 11(3): 676. CrossRef

[Protocol] Use of Cas9 Targeting and Red Recombination for Designer Phage Engineering: Shin-Yae Choi , Danitza Xiomara Romero-Calle , Han-Gyu Cho , Hee-Won Bae , You-Hee Cho; J. Microbiol. 2024;62(1):1-10. Published online February 1, 2024; DOI: https://doi.org/10.1007/s12275-024-00107-2

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Abstract

Bacteriophages (phages) are natural antibiotics and biological nanoparticles, whose application is significantly boosted by recent advances of synthetic biology tools. Designer phages are synthetic phages created by genome engineering in a way to increase the benefits or decrease the drawbacks of natural phages. Here we report the development of a straightforward genome engineering method to efficiently obtain engineered phages in a model bacterial pathogen, Pseudomonas aeruginosa. This was achieved by eliminating the wild type phages based on the Streptococcus pyogenes Cas9 (SpCas9) and facilitating the recombinant generation based on the Red recombination system of the coliphage λ (λRed). The producer (PD) cells of P. aeruginosa strain PAO1 was created by miniTn7-based chromosomal integration of the genes for SpCas9 and λRed under an inducible promoter. To validate the efficiency of the recombinant generation, we created the fluorescent phages from a temperate phage MP29. A plasmid bearing the single guide RNA (sgRNA) gene for selectively targeting the wild type gp35 gene and the editing template for tagging the Gp35 with superfolder green fluorescent protein (sfGFP) was introduced into the PD cells by electroporation. We found that the targeting efficiency was affected by the position and number of sgRNA. The fluorescent phage particles were efficiently recovered from the culture of the PD cells expressing dual sgRNA molecules. This protocol can be used to create designer phages in P. aeruginosa for both application and research purposes.

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Pilin regions that select for the small RNA phages in Pseudomonas aeruginosa type IV pilus
Hee-Won Bae, Hyeong-Jun Ki, Shin-Yae Choi, You-Hee Cho, Kristin N. Parent
Journal of Virology.2025;[Epub] CrossRef
Characteristics of bioaerosols under high-ozone periods, haze episodes, dust storms, and normal days in Xi’an, China
Yiming Yang, Liu Yang, Xiaoyan Hu, Zhenxing Shen
Particuology.2024; 90: 140. CrossRef
Airborne desert dust and aeromicrobiology over the Turkish Mediterranean coastline
Dale W. Griffin, Nilgün Kubilay, Mustafa Koçak, Mike A. Gray, Timothy C. Borden, Eugene A. Shinn
Atmospheric Environment.2007; 41(19): 4050. CrossRef

Review

Bacterial Crosstalk via Antimicrobial Peptides on the Human Skin: Therapeutics from a Sustainable Perspective: Seon Mi Lee , Hye Lim Keum , Woo Jun Sul; J. Microbiol. 2023;61(1):1-11. Published online January 31, 2023; DOI: https://doi.org/10.1007/s12275-022-00002-8

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Abstract

The skin’s epidermis is an essential barrier as the first guard against invading pathogens, and physical protector from external injury. The skin microbiome, which consists of numerous bacteria, fungi, viruses, and archaea on the epidermis, play a key role in skin homeostasis. Antibiotics are a fast-acting and effective treatment method, however, antibiotic use is a nuisance that can disrupt skin homeostasis by eradicating beneficial bacteria along with the intended pathogens and cause antibioticresistant bacteria spread. Increased numbers of antimicrobial peptides (AMPs) derived from humans and bacteria have been reported, and their roles have been well defined. Recently, modulation of the skin microbiome with AMPs rather than artificially synthesized antibiotics has attracted the attention of researchers as many antibiotic-resistant strains make treatment mediation difficult in the context of ecological problems. Herein, we discuss the overall insights into the skin microbiome, including its regulation by different AMPs, as well as their composition and role in health and disease.

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The epidermal lipid-microbiome loop and immunity: Important players in atopic dermatitis
Junchao Wu, Lisha Li, Tingrui Zhang, Jiaye Lu, Zongguang Tai, Quangang Zhu, Zhongjian Chen
Journal of Advanced Research.2025; 68: 359. CrossRef
Marine algal polysaccharides: Multifunctional bioactive ingredients for cosmetic formulations
Si-Yuan Lu, Tao Zhou, Iqra Shabbir, Jaehwan Choi, Young Heui Kim, Myeongsam Park, Jude Juventus Aweya, Karsoon Tan, Saiyi Zhong, Kit-Leong Cheong
Carbohydrate Polymers.2025; 353: 123276. CrossRef
A review on pathogenicity of Aeromonas hydrophila and their mitigation through medicinal herbs in aquaculture
Anurag Semwal, Avdhesh Kumar, Neelesh Kumar
Heliyon.2023; 9(3): e14088. CrossRef
Fırtına Deresindeki Gökkuşağı Alabalık Çiftliklerinde İzole Edilen Aeromonas spp. İzolatlarının Antimikrobiyel Hassasiyetin Belirlenmesi
Fikri BALTA
Journal of Anatolian Environmental and Animal Sciences.2020; 5(3): 397. CrossRef
Monitoring microbial community structure and succession of an A/O SBR during start-up period using PCR-DGGE
Xiuheng WANG, Kun ZHANG, Nanqi REN, Nan LI, Lijiao REN
Journal of Environmental Sciences.2009; 21(2): 223. CrossRef

Journal Articles

Assessing the microcystins concentration through optimized protein phosphatase inhibition assay in environmental samples: Kyoung-Hee Oh , Kung-Min Beak , Yuna Shin , Young-Cheol Cho; J. Microbiol. 2022;60(6):602-609. Published online April 30, 2022; DOI: https://doi.org/10.1007/s12275-022-2020-4

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Abstract

Protein phosphatase (PPase) inhibition assay (PPIA) is widely used to analyze the concentration of microcystins (MCs) because it is comparatively less expensive and faster than other assays. This study aimed to optimize the PPIA by determining a suitable reaction terminator and an optimal methanol concentration in the sample. The most suitable reaction time was 90 min, with the corresponding methanol concentration in the sample being 15% or less. When p-nitrophenyl phosphate (pNPP) was used as a substrate, copper chloride solution was suitably used as a reaction terminator, and when 4- methylumbelliferyl phosphate (MUP) was used, a glycine buffer not only increased the measurement sensitivity of the reaction product but also terminated the enzymatic reaction. When PPase 1 and MUP were used as an enzyme and a substrate, respectively, the limit of quantitation for MC-leucine/ arginine (LR) was 0.02 μg/L, whereas it was 0.1 μg/L when pNPP was used as a substrate. The proposed method facilitated the measurement of MC-LR concentration without additional pretreatments, such as concentration or purification; therefore, this method was suitable and feasible for the continuous monitoring of MCs in drinking water.

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Analyzing MC-LR distribution characteristics in natural lakes by a novel fluorescence technology
Xiangyu Hu, Zhaomin Wang, Xiao Ye, Ping Xie, Yong Liu
Environmental Pollution.2024; 342: 123123. CrossRef
Magnetic solid phase extraction coupled with high-performance liquid chromatography-diode array detection based on assembled magnetic covalent organic frameworks for selective extraction and detection of microcystins in aquatic foods
Tianliang Wang, Hongzhen Xie, Yuting Cao, Qing Xu, Ning Gan
Journal of Chromatography A.2022; 1685: 463614. CrossRef

[PROTOCOL] Flow cytometric monitoring of the bacterial phenotypic diversity in aquatic ecosystems: Jin-Kyung Hong , Soo Bin Kim , Seok Hyun Ahn , Yongjoo Choi , Tae Kwon Lee; J. Microbiol. 2021;59(10):879-885. Published online September 23, 2021; DOI: https://doi.org/10.1007/s12275-021-1443-7

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Abstract

Flow cytometry is a promising tool used to identify the phenotypic features of bacterial communities in aquatic ecosystems by measuring the physical and chemical properties of cells based on their light scattering behavior and fluorescence. Compared to molecular or culture-based approaches, flow cytometry is suitable for the online monitoring of microbial water quality because of its relatively simple sample preparation process, rapid analysis time, and high-resolution phenotypic data. Advanced statistical techniques (e.g., denoising and binning) can be utilized to successfully calculate phenotypic diversity by processing the scatter data obtained from flow cytometry. These phenotypic diversities were well correlated with taxonomic-based diversity computed using nextgeneration 16S RNA gene sequencing. The protocol provided in this paper should be a useful guide for a fast and reliable flow cytometric monitoring of bacterial phenotypic diversity in aquatic ecosystems.

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Assessing long-term ecological impacts of PCE contamination in groundwater using a flow cytometric fingerprint approach
Jin-Kyung Hong, Soo Bin Kim, Gui Nam Wee, Bo Ram Kang, Jee Hyun No, Susmita Das Nishu, Joonhong Park, Tae Kwon Lee
Science of The Total Environment.2024; 931: 172698. CrossRef
Phenotypic shifts induced by environmental pre-stressors modify antibiotic resistance in Staphylococcus aureus
Gui Nam Wee, Eun Sun Lyou, Susmita Das Nishu, Tae Kwon Lee
Frontiers in Microbiology.2023;[Epub] CrossRef

Raman spectroscopy reveals alteration of spore compositions under different nutritional conditions in Lysinibacillus boronitolerans YS11: Youngung Ryu , Minyoung Hong , Soo Bin Kim , Tae Kwon Lee , Woojun Park; J. Microbiol. 2021;59(5):491-499. Published online March 29, 2021; DOI: https://doi.org/10.1007/s12275-021-0679-6

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Abstract

Little is known about final spores components when bacteria undergo sporulation under different nutrient conditions. Different degrees of resistance and germination rates were observed in the three types of spores of Lysinibacillus boronitolerans YS11 (SD, Spores formed in Difco sporulation mediumTM; SC and SF, Spores formed in an agricultural byproduct medium with 10 mM CaCl2 and with 10 mM FeSO4, respectively). Stronger UV resistance was recorded for SF with 1.8–2.3-fold greater survival than SC and SD under UV treatment. The three spore types showed similar heat resistances at 80°C, but survival rates of SC and SD were much higher (~1,000 times) than those of SF at 90°C. However, germination capacity of SF was 20% higher than those of SD and SC on Luria-Bertani agar plates for 24 h. SF germinated more rapidly in a liquid medium with high NaCl concentrations than SC and SD, but became slower under alkaline conditions. Raman spectroscopy was used to analyze the heterogeneities in the three types of vegetative cells and their spores under different nutritional conditions. Exponentially grown-each vegetative cells had different overall Raman peak values. Raman peaks of SC, SD, and SF also showed differences in adenine and amide III compositions and nucleic acid contents. Our data along with Raman spectroscopy provided the evidence that spores formed under under different growth conditions possess very different cellular components, which affected their survival and germination rates.

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Characterization of the Bacillus cereus spore killed by plasma-activated water (PAW)
Xiao Hu, Pengfei Ge, Xiaomeng Wang, Xinyu Liao, Jinsong Feng, Ruiling Lv, Tian Ding
Food Research International.2024; 196: 115058. CrossRef
Alleviation of H2O2 toxicity by extracellular catalases in the phycosphere of Microcystis aeruginosa
Yerim Park, Wonjae Kim, Yeji Cha, Minkyung Kim, Woojun Park
Harmful Algae.2024; 137: 102680. CrossRef
Effects of sporulation conditions on the growth, germination, and resistance of Clostridium perfringens spores
Dong Liang, Xiaoshuang Cui, Miaoyun Li, Yaodi Zhu, Lijun Zhao, Shijie Liu, Gaiming Zhao, Na Wang, Yangyang Ma, Lina Xu
International Journal of Food Microbiology.2023; 396: 110200. CrossRef
Lysinibacilli: A Biological Factories Intended for Bio-Insecticidal, Bio-Control, and Bioremediation Activities
Qazi Mohammad Sajid Jamal, Varish Ahmad
Journal of Fungi.2022; 8(12): 1288. CrossRef
Discrimination of Stressed and Non-Stressed Food-Related Bacteria Using Raman-Microspectroscopy
Daniel Klein, René Breuch, Jessica Reinmüller, Carsten Engelhard, Peter Kaul
Foods.2022; 11(10): 1506. CrossRef
Detection of low numbers of bacterial cells in a pharmaceutical drug product using Raman spectroscopy and PLS-DA multivariate analysis
R. A. Grosso, A. R. Walther, E. Brunbech, A. Sørensen, B. Schebye, K. E. Olsen, H. Qu, M. A. B. Hedegaard, E. C. Arnspang
The Analyst.2022; 147(15): 3593. CrossRef
Linkage between bacterial community-mediated hydrogen peroxide detoxification and the growth of Microcystis aeruginosa
Minkyung Kim, Wonjae Kim, Yunho Lee, Woojun Park
Water Research.2021; 207: 117784. CrossRef

Patterns and drivers of Vibrio isolates phylogenetic diversity in the Beibu Gulf, China: Xing Chen , Hong Du , Si Chen , Xiaoli Li , Huaxian Zhao , Qiangsheng Xu , Jinli Tang , Gonglingxia Jiang , Shuqi Zou , Ke Dong , Jonathan M. Adams , Nan Li , Chengjian Jiang; J. Microbiol. 2020;58(12):998-1009. Published online October 23, 2020; DOI: https://doi.org/10.1007/s12275-020-0293-z

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Abstract

Members of the genus Vibrio are ubiquitous in aquatic environments and can be found either in a culturable or a viable but nonculturable (VBNC) state. Despite widespread concerns as to how to define the occurrence and dynamics of Vibrio populations by culture-independent approaches, further physiological research and relevant biotechnological developments will require the isolation and cultivation of the microbes from various environments. The present work provides data and perspectives on our understanding of culturable Vibrio community structure and diversity in the Beibu Gulf. Finally, we isolated 1,037 strains of Vibrio from 45 samples and identified 18 different species. Vibrio alginolyticus, V. cyclitrophicus, V. tasmaniensis, V. brasiliensis, and V. splendidus were the dominant species that had regional distribution characteristics. The correlation between the quantitative distribution and community structure of culturable Vibrio and environmental factors varied with the Vibrio species and geographical locations. Among them, salinity, nitrogen, and phosphorus were the main factors affecting the diversity of culturable Vibrio. These results help to fill a knowledge gap on Vibrio diversity and provide data for predicting and controlling pathogenic Vibrio outbreaks in the Beibu Gulf.

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Environmental factors that regulate Vibrio spp. abundance and community structure in tropical waters
Yi You Wong, Choon Weng Lee, Chui Wei Bong, Joon Hai Lim, Ching Ching Ng, Kumaran Narayanan, Edmund Ui Hang Sim, Ai-jun Wang
Anthropocene Coasts.2024;[Epub] CrossRef
Co-occurrence of chromophytic phytoplankton and the Vibrio community during Phaeocystis globosa blooms in the Beibu Gulf
Qiangsheng Xu, Pengbin Wang, Jinghua Huangleng, Huiqi Su, Panyan Chen, Xing Chen, Huaxian Zhao, Zhenjun Kang, Jinli Tang, Gonglingxia Jiang, Zhuoting Li, Shuqi Zou, Ke Dong, Yuqing Huang, Nan Li
Science of The Total Environment.2022; 805: 150303. CrossRef
Virulence mechanisms of vibrios belonging to the Splendidus clade as aquaculture pathogens, from case studies and genome data
Weiwei Zhang, Chenghua Li
Reviews in Aquaculture.2021; 13(4): 2004. CrossRef

Phenotypic characterization of a conserved inner membrane protein YhcB in Escherichia coli: Chul Gi Sung , Umji Choi , Chang-Ro Lee; J. Microbiol. 2020;58(7):598-605. Published online April 22, 2020; DOI: https://doi.org/10.1007/s12275-020-0078-4

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Abstract

Although bacteria have diverse membrane proteins, the function of many of them remains unknown or uncertain even in Escherichia coli. In this study, to investigate the function of hypothetical membrane proteins, genome-wide analysis of phenotypes of hypothetical membrane proteins was performed under various envelope stresses. Several genes responsible for adaptation to envelope stresses were identified. Among them, deletion of YhcB, a conserved inner membrane protein of unknown function, caused high sensitivities to various envelope stresses and increased membrane permeability, and caused growth defect under normal growth conditions. Furthermore, yhcB deletion resulted in morphological aberration, such as branched shape, and cell division defects, such as filamentous growth and the generation of chromosome- less cells. The analysis of antibiotic susceptibility showed that the yhcB mutant was highly susceptible to various anti-folate antibiotics. Notably, all phenotypes of the yhcB mutant were completely or significantly restored by YhcB without the transmembrane domain, indicating that the localization of YhcB on the inner membrane is dispensable for its function. Taken together, our results demonstrate that YhcB is involved in cell morphology and cell division in a membrane localization-independent manner.

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Co-ordinated assembly of the multilayered cell envelope of Gram-negative bacteria
Elayne M Fivenson, Laurent Dubois, Thomas G Bernhardt
Current Opinion in Microbiology.2024; 79: 102479. CrossRef
Loss of YhcB results in overactive fatty acid biosynthesis
Hannah M. Stanley, M. Stephen Trent, K. Heran Darwin
mBio.2024;[Epub] CrossRef
A New Factor LapD Is Required for the Regulation of LpxC Amounts and Lipopolysaccharide Trafficking
Alicja Wieczorek, Anna Sendobra, Akshey Maniyeri, Magdalena Sugalska, Gracjana Klein, Satish Raina
International Journal of Molecular Sciences.2022; 23(17): 9706. CrossRef
Loss of YhcB results in dysregulation of coordinated peptidoglycan, LPS and phospholipid synthesis during Escherichia coli cell growth
Emily C. A. Goodall, Georgia L. Isom, Jessica L. Rooke, Karthik Pullela, Christopher Icke, Zihao Yang, Gabriela Boelter, Alun Jones, Isabel Warner, Rochelle Da Costa, Bing Zhang, James Rae, Wee Boon Tan, Matthias Winkle, Antoine Delhaye, Eva Heinz, Jean-F
PLOS Genetics.2021; 17(12): e1009586. CrossRef
The inner membrane protein LapB is required for adaptation to cold stress in an LpxC-independent manner
Han Byeol Lee, Si Hyoung Park, Chang-Ro Lee
Journal of Microbiology.2021; 59(7): 666. CrossRef

Soft sweep development of resistance in Escherichia coli under fluoroquinolone stress: Xianxing Xie , Ruichen Lv , Chao Yang , Yajun Song , Yanfeng Yan , Yujun Cui , Ruifu Yang; J. Microbiol. 2019;57(12):1056-1064. Published online September 25, 2019; DOI: https://doi.org/10.1007/s12275-019-9177-5

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Abstract

We employed a stepwise selection model for investigating the dynamics of antibiotic-resistant variants in Escherichia coli K-12 treated with increasing concentrations of ciprofloxacin (CIP). Firstly, we used Sanger sequencing to screen the variations in the fluoquinolone target genes, then, employed Illumina NGS sequencing for amplicons targeted regions with variations. The results demonstrated that variations G81C in gyrA and K276N and K277L in parC are standing resistance variations (SRVs), while S83A and S83L in gyrA and G78C in parC were emerging resistance variations (ERVs). The variants containing SRVs and/or ERVs were selected successively based on their sensitivities to CIP. Variant strain 1, containing substitution G81C in gyrA, was immediately selected following ciprofloxacin exposure, with obvious increases in the parC SRV, and parC and gyrA ERV allele frequencies. Variant strain 2, containing the SRVs, then dominated the population following a 20× increase in ciprofloxacin concentration, with other associated allele frequencies also elevated. Variant strains 3 and 4, containing ERVs in gyrA and parC, respectively, were then selected at 40× and 160× antibiotic concentrations. Two variants, strains 5 and 6, generated in the selection procedure, were lost because of higher fitness costs or a lower level of resistance compared with variants 3 and 4. For the second induction, all variations/indels were already present as SRVs and selected out step by step at different passages. Whatever the first induction or second induction, our results confirmed the soft selective sweep hypothesis and provided critical information for guiding clinical treatment of pathogens containing SRVs.

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Could traces of fluoroquinolones in food induce ciprofloxacin resistance in Escherichia coli and Klebsiella pneumoniae ? An in vivo study in Galleria mellonel
Zina Gestels, Yuliia Baranchyk, Dorien Van den Bossche, Jolein Laumen, Said Abdellati, Basil Britto Xavier, Sheeba Santhini Manoharan-Basil, Chris Kenyon, Sadjia Bekal, Mustafa Sadek
Microbiology Spectrum.2024;[Epub] CrossRef

Transcriptome analysis to understand the effects of the toxoflavin and tropolone produced by phytopathogenic Burkholderia on Escherichia coli: Jungwook Park , Hyun-Hee Lee , Hyejung Jung , Young-Su Seo; J. Microbiol. 2019;57(9):781-794. Published online August 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9330-1

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Abstract

The phytopathogenic Burkholderia species B. glumae and B. plantarii are the causal agents of bacterial wilt, grain rot, and seedling blight, which threaten the rice industry globally. Toxoflavin and tropolone are produced by these phytopathogens and are considered the most hostile biohazards with a broad spectrum of target organisms. However, despite their nonspecific toxicity, the effects of toxoflavin and tropolone on bacteria remain unknown. RNA-seq based transcriptome analysis was employed to determine the genome-wide expression patterns under phytotoxin treatment. Expression of 2327 and 830 genes was differentially changed by toxoflavin and tropolone, respectively. Enriched biological pathways reflected the down-regulation of oxidative phosphorylation and ribosome function, beginning with the inhibition of membrane biosynthesis and nitrogen metabolism under oxidative stress or iron starvation. Conversely, several systems such as bacterial chemotaxis, flagellar assembly, biofilm formation, and sulfur/taurine transporters were highly expressed as countermeasures against the phytotoxins. In addition, our findings revealed that three hub genes commonly induced by both phytotoxins function as the siderophore enterobactin, an ironchelator. Our study provides new insights into the effects of phytotoxins on bacteria for better understanding of the interactions between phytopathogens and other microorganisms. These data will also be applied as a valuable source in subsequent applications against phytotoxins, the major virulence factor.

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AHL-Based Quorum Sensing Regulates the Biosynthesis of a Variety of Bioactive Molecules in Bacteria
Mélanie Gonzales, Pauline Jacquet, Floriane Gaucher, Éric Chabrière, Laure Plener, David Daudé
Journal of Natural Products.2024; 87(4): 1268. CrossRef
Determination of bacterial toxin toxoflavin and fervenulin in food and identification of their degradation products
Hui Wang, Lili Hu, Xiaotu Chang, Yuge Hu, Yan Zhang, Peng Zhou, Xiaojiao Cui
Food Chemistry.2023; 399: 134010. CrossRef
Antimicrobial peptides in combination with citronellal efficiently kills multidrug resistance bacteria
Zhanyi Yang, Shiqi He, Yingxin Wei, Xuefeng Li, Anshan Shan, Jiajun Wang
Phytomedicine.2023; 120: 155070. CrossRef
A membrane protein of the rice pathogen Burkholderia glumae required for oxalic acid secretion and quorum sensing
Asif Iqbal, George Nwokocha, Vijay Tiwari, Inderjit K. Barphagha, Anne Grove, Jong Hyun Ham, William T. Doerrler
Molecular Plant Pathology.2023; 24(11): 1400. CrossRef
Characterisation of Pythium aristosporum Oomycete—A Novel Pathogen Causing Rice Seedling Blight in China
Jinxin Liu, Ruisi Zhang, Chuzhen Xu, Chunlai Liu, Yanyan Zheng, Xue Zhang, Shasha Liu, Yonggang Li
Journal of Fungi.2022; 8(9): 890. CrossRef
Toxoflavin secreted by Pseudomonas alcaliphila inhibits the growth of Legionella pneumophila and Vermamoeba vermiformis
Sebastien P. Faucher, Sara Matthews, Arvin Nickzad, Passoret Vounba, Deeksha Shetty, Émilie Bédard, Michele Prévost, Eric Déziel, Kiran Paranjape
Water Research.2022; 216: 118328. CrossRef
Chemical or Genetic Alteration of Proton Motive Force Results in Loss of Virulence of Burkholderia glumae, the Cause of Rice Bacterial Panicle Blight
Asif Iqbal, Pradip R. Panta, John Ontoy, Jobelle Bruno, Jong Hyun Ham, William T. Doerrler, Gladys Alexandre
Applied and Environmental Microbiology.2021;[Epub] CrossRef
Multiple endogenous seed-born bacteria recovered rice growth disruption caused by Burkholderia glumae
Chiharu Akimoto-Tomiyama
Scientific Reports.2021;[Epub] CrossRef

Reviews

MINIREVIEW] EAST1 toxin: An enigmatic molecule associated with sporadic episodes of diarrhea in humans and animals: J. Daniel Dubreuil; J. Microbiol. 2019;57(7):541-549. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8651-4

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Abstract

EAST1 is produced by a subset of enteroaggregative Escherichia coli strains. This toxin is a 38-amino acid peptide of 4100 Da. It shares 50% homology with the enterotoxic domain of STa and interacts with the same receptor. The mechanism of action of EAST1is proposed to be identical to that of STa eliciting a cGMP increase. EAST1 is associated with diarrheal disease in Man and various animal species including cattle and swine. Nevertheless, as EAST1-positive strains as well as culture supernatants did not provoke unequivocally diarrhea either in animal models or in human volunteers, the role of this toxin in disease is today still debated. This review intent is to examine the role of EAST1 toxin in diarrheal illnesses.

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REVIEW] Antibiotic-resistant clones in Gram-negative pathogens: presence of global clones in Korea: Kwan Soo Ko; J. Microbiol. 2019;57(3):195-202. Published online October 2, 2018; DOI: https://doi.org/10.1007/s12275-019-8491-2

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Abstract

Antibiotic resistance is a global concern in public health. Antibiotic-resistant clones can spread nationally, internationally, and globally. This review considers representative antibiotic-resistant Gram-negative bacterial clones–CTX-M- 15-producing ST131 in Escherichia coli, extended-spectrum β-lactamase-producing ST11 and KPC-producing ST258 in Klebsiella pneumoniae, IMP-6-producing, carbapenem-resistant ST235 in Pseudomonas aeruginosa, and OXA-23- producing global clone 2 in Acinetobacter baumannii–that have disseminated worldwide, including in Korea. The findings highlight the urgency for systematic monitoring and international cooperation to suppress the emergence and propagation of antibiotic resistance.

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Journal Article

Hydrogen sulfide inhibits the growth of Escherichia coli through oxidative damage: Liu-Hui Fu , Zeng-Zheng Wei , Kang-Di Hu , Lan-Ying Hu , Yan-Hong Li , Xiao-Yan Chen , Zhuo Han , Gai-Fang Yao , Hua Zhang; J. Microbiol. 2018;56(4):238-245. Published online February 28, 2018; DOI: https://doi.org/10.1007/s12275-018-7537-1

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Abstract

Many studies have shown that hydrogen sulfide (H2S) is both detrimental and beneficial to animals and plants, whereas its effect on bacteria is not fully understood. Here, we report that H2S, released by sodium hydrosulfide (NaHS), significantly inhibits the growth of Escherichia coli in a dose-dependent manner. Further studies have shown that H2S treatment stimulates the production of reactive oxygen species (ROS) and decreases glutathione (GSH) levels in E. coli, resulting in lipid peroxidation and DNA damage. H2S also inhibits the antioxidative enzyme activities of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) and induces the response of the SoxRS and OxyR regulons in E. coli. Moreover, pretreatment with the antioxidant ascorbic acid (AsA) could effectively prevent H2S-induced toxicity in E. coli. Taken together, our results indicate that H2S exhibits an antibacterial effect on E. coli through oxidative damage and suggest a possible application for H2S in water and food processing.

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