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Different Adaption Strategies of Abundant and Rare Microbial Communities in Sediment and Water of East Dongting Lake
Yabing Gu, Junsheng Li, Zhenghua Liu, Min Zhang, Zhaoyue Yang, Huaqun Yin, Liyuan Chai, Delong Meng, Nengwen Xiao
J. Microbiol. 2024;62(10):829-843.   Published online October 22, 2024
DOI: https://doi.org/10.1007/s12275-024-00171-8
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AbstractAbstract
The dynamics of aquatic microbes is of great importance for comprehending the acclimatisation and evolution of microorganisms in lake ecology. However, little is known about the adaption strategies of microbial communities in East Dongting Lake, which had special and complexity geographical characteristics. A semi-enclosed lake area (A) and a waterway connected to Yangtze River (B) both existed in the lake zone. Here, we investigated bacterial and fungal community diversity, community network and community assembly processes in sediment and water. The results indicated that the proportion of OTU numbers and their relative abundance for rare and abundant taxa were different obviously between sediment and water, but not between bacteria and fungi. However, abundant subcommunities dominated the shifts of bacterial community diversity and structure in A region, while rare subcommunities for fungal community diversity. Compared to fungal community, bacterial network was more compact and more key stones were identified as rare taxa. In addition, stochastic processes (dispersal limitation) drove the community assembly of abundant and rare subcommunities, but the effects of deterministic processes (including variable and heterogeneous selections) affected more on rare rather than abundant taxa. Partial Mantel test further indicated that the effect of environmental factors was a stronger force in shaping abundant bacterial subcommunities (TOC, NH4+-N, TN, and ORP) and rare fungal subcommunities (ORP). Environmental factors explained more of the variation in bacterial community structure than that in fungal community structure, although they had additional effects on fungal community diversity and community assembly. Moreover, bacterial community affected the fungal community as a biotic factor in water. This research provided new insights into better understanding of microbial communities in the complex environment of the East Dongting Lake.
LAMMER Kinase Governs the Expression and Cellular Localization of Gas2, a Key Regulator of Flocculation in Schizosaccharomyces pombe
Won-Hwa Kang , Yoon-Dong Park , Joo-Yeon Lim , Hee-Moon Park
J. Microbiol. 2024;62(1):21-31.   Published online January 5, 2024
DOI: https://doi.org/10.1007/s12275-023-00097-7
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AbstractAbstract
It was reported that LAMMER kinase in Schizosaccharomyces pombe plays an important role in cation-dependent and galactose-specific flocculation. Analogous to other flocculating yeasts, when cell wall extracts of the Δlkh1 strain were treated to the wild-type strain, it displayed flocculation. Gas2, a 1,3-β-glucanosyl transferase, was isolated from the EDTA-extracted cell-surface proteins in the Δlkh1 strain. While disruption of the gas2+ gene was not lethal and reduced the flocculation activity of the Δlkh1 strain, the expression of a secreted form of Gas2, in which the GPI anchor addition sequences had been removed, conferred the ability to flocculate upon the WT strain. The Gas2-mediated flocculation was strongly inhibited by galactose but not by glucose. Immunostaining analysis showed that the cell surface localization of Gas2 was crucial for the flocculation of fission yeast. In addition, we identified the regulation of mbx2+ expression by Lkh1 using RT-qPCR. Taken together, we found that Lkh1 induces asexual flocculation by regulating not only the localization of Gas2 but also the transcription of gas2+ through Mbx2.
Antiviral Activity Against SARS‑CoV‑2 Variants Using in Silico and in Vitro Approaches
Hee-Jung Lee , Hanul Choi , Aleksandra Nowakowska , Lin-Woo Kang , Minjee Kim , Young Bong Kim
J. Microbiol. 2023;61(7):703-711.   Published online June 26, 2023
DOI: https://doi.org/10.1007/s12275-023-00062-4
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AbstractAbstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emergence in 2019 led to global health crises and the persistent risk of viral mutations. To combat SARS-CoV-2 variants, researchers have explored new approaches to identifying potential targets for coronaviruses. This study aimed to identify SARS-CoV-2 inhibitors using drug repurposing. In silico studies and network pharmacology were conducted to validate targets and coronavirus-associated diseases to select potential candidates, and in vitro assays were performed to evaluate the antiviral effects of the candidate drugs to elucidate the mechanisms of the viruses at the molecular level and determine the effective antiviral drugs for them. Plaque and cytopathic effect reduction were evaluated, and real-time quantitative reverse transcription was used to evaluate the antiviral activity of the candidate drugs against SARS-CoV-2 variants in vitro. Finally, a comparison was made between the molecular docking binding affinities of fenofibrate and remdesivir (positive control) to conventional and identified targets validated from protein–protein interaction (PPI). Seven candidate drugs were obtained based on the biological targets of the coronavirus, and potential targets were identified by constructing complex disease targets and PPI networks. Among the candidates, fenofibrate exhibited the strongest inhibition effect 1 h after Vero E6 cell infection with SARS-CoV-2 variants. This study identified potential targets for coronavirus disease (COVID-19) and SARS-CoV-2 and suggested fenofibrate as a potential therapy for COVID-19.

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  • Distinctive Combinations of RBD Mutations Contribute to Antibody Evasion in the Case of the SARS-CoV-2 Beta Variant
    Tae-Hun Kim, Sojung Bae, Sunggeun Goo, Jinjong Myoung
    Journal of Microbiology and Biotechnology.2023; 33(12): 1587.     CrossRef
Prevalence and characteristics of the mcr-1 gene in retail meat samples in Zhejiang Province, China
Biao Tang , Jiang Chang , Yi Luo , Han Jiang , Canying Liu , Xingning Xiao , Xiaofeng Ji , Hua Yang
J. Microbiol. 2022;60(6):610-619.   Published online March 31, 2022
DOI: https://doi.org/10.1007/s12275-022-1597-y
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AbstractAbstract
Considering the serious threat to food safety and public health posed by pathogens with colistin resistance, colistin was banned as a growth promoter in 2017 in China. In recent years, the resistance rate of Escherichia coli isolated from animal intestines or feces to colistin has decreased. However, the prevalence and characteristics of the mcr-1 gene in retail meat have not been well explored. Herein, 106 mcr-1-negative and 16 mcr- 1-positive E. coli isolates were randomly recovered from 120 retail meat samples and screened using colistin. The 106 E. coli isolates showed maximum resistance to sulfafurazole (73.58%) and tetracycline (62.26%) but susceptibility to colistin (0.00%). All 16 mcr-1-positive E. coli isolates showed resistance to colistin, were extended spectrum beta-lactamase (ESBL)-positive and exhibited complex multidrug resistance (MDR). For these 16 isolates, 17 plasmid replicons and 42 antibiotic resistance genes were identified, and at least 7 antibiotic resistance genes were found in each isolate. Acquired disinfectant resistance genes were identified in 75.00% (12/16) of the isolates. Furthermore, comparative genomic and phylogenetic analysis
results
indicated that these 16 mcr-1-positive E. coli isolates and the most prevalent mcr-1-harboring IncI2 plasmid in this study were closely related to other previously reported mcr-1-positive E. coli isolates and the IncI2 plasmid, respectively, showing their wide distribution. Taken together, our findings showed that retail meat products were a crucial reservoir of mcr-1 during the colistin ban period and should be continuously monitored.

Citations

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  • Regression models from portable NIR spectra for predicting the carcass traits and meat quality of beef cattle
    Nathália Veloso Trópia, Rizielly Saraiva Reis Vilela, Flávia Adriane de Sales Silva, Dhones Rodrigues Andrade, Adailton Camêlo Costa, Fernando Alerrandro Andrade Cidrini, Jardeson de Souza Pinheiro, Pauliane Pucetti, Mario Luiz Chizzotti, Sebastião de Cam
    PLOS ONE.2024; 19(5): e0303946.     CrossRef
  • IncHI1 plasmids mediated the tet(X4) gene spread in Enterobacteriaceae in porcine
    Jiangang Ma, Juan Wang, Hua Yang, Mengru Su, Ruichao Li, Li Bai, Jie Feng, Yuting Huang, Zengqi Yang, Biao Tang
    Frontiers in Microbiology.2023;[Epub]     CrossRef
  • Prevalence and molecular characteristics of polymyxin-resistant Enterobacterales in a Chinese tertiary teaching hospital
    Chenlu Xiao, Xuming Li, Lianjiang Huang, Huiluo Cao, Lizhong Han, Yuxing Ni, Han Xia, Zhitao Yang
    Frontiers in Cellular and Infection Microbiology.2023;[Epub]     CrossRef
  • Farm to table: colistin resistance hitchhiking through food
    Absar Talat, Carla Miranda, Patrícia Poeta, Asad U. Khan
    Archives of Microbiology.2023;[Epub]     CrossRef
  • Detection of mcr-1-harbouring Escherichia coli by quantum dot labelling of synthetic small peptides mimicking lipopolysaccharide receptors
    Chenghao Wang, Biao Tang, Jiusheng Wu, Xi Jin, Shuwen Ke, Hua Yang, Yuehuan Liu
    International Journal of Antimicrobial Agents.2023; 62(3): 106898.     CrossRef
  • Genomic characterization of multidrug-resistance gene cfr in Escherichia coli recovered from food animals in Eastern China
    Biao Tang, Juan Ni, Jiahui Lin, Yangying Sun, Hui Lin, Yuehong Wu, Hua Yang, Min Yue
    Frontiers in Microbiology.2022;[Epub]     CrossRef
  • Antimicrobial resistance and genomic characterization of Escherichia coli from pigs and chickens in Zhejiang, China
    Wei Zhou, Rumeng Lin, Zhijin Zhou, Jiangang Ma, Hui Lin, Xue Zheng, Jingge Wang, Jing Wu, Yuzhi Dong, Han Jiang, Hua Yang, Zhangnv Yang, Biao Tang, Min Yue
    Frontiers in Microbiology.2022;[Epub]     CrossRef
  • The Occurrence and Genomic Characteristics of mcr-1-Harboring Salmonella from Retail Meats and Eggs in Qingdao, China
    Changan Li, Xiulei Gu, Liping Zhang, Yuqing Liu, Yan Li, Ming Zou, Baotao Liu
    Foods.2022; 11(23): 3854.     CrossRef
Regulator of ribonuclease activity modulates the pathogenicity of Vibrio vulnificus
Jaejin Lee , Eunkyoung Shin , Jaeyeong Park , Minho Lee , Kangseok Lee
J. Microbiol. 2021;59(12):1133-1141.   Published online November 9, 2021
DOI: https://doi.org/10.1007/s12275-021-1518-5
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AbstractAbstract
RraA, a protein regulator of RNase E activity, plays a unique role in modulating the mRNA abundance in Escherichia coli. The marine pathogenic bacterium Vibrio vulnificus also possesses homologs of RNase E (VvRNase E) and RraA (VvRraA1 and VvRraA2). However, their physiological roles have not yet been investigated. In this study, we demonstrated that VvRraA1 expression levels affect the pathogenicity of V. vulnificus. Compared to the wild-type strain, the VvrraA1-deleted strain (ΔVvrraA1) showed decreased motility, invasiveness, biofilm formation ability as well as virulence in mice; these phenotypic changes of ΔVvrraA1 were restored by the exogenous expression of VvrraA1. Transcriptomic analysis indicated that VvRraA1 expression levels affect the abundance of a large number of mRNA species. Among them, the halflives of mRNA species encoding virulence factors (e.g., smcR and htpG) that have been previously shown to affect VvrraA1 expression-dependent phenotypes were positively correlated with VvrraA1 expression levels. These findings suggest that VvRraA1 modulates the pathogenicity of V. vulnificus by regulating the abundance of a subset of mRNA species.

Citations

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  • Identification of the global regulatory roles of RraA via the integrative transcriptome and proteome in Vibrio alginolyticus
    Huizhen Chen, Qian Gao, Bing Liu, Ying Zhang, Jianxiang Fang, Songbiao Wang, Youqi Chen, Chang Chen, Nicolas E. Buchler
    mSphere.2024;[Epub]     CrossRef
  • Comparative Transcriptomic Analysis of Flagellar-Associated Genes in Salmonella Typhimurium and Its rnc Mutant
    Seungmok Han, Ji-Won Byun, Minho Lee
    Journal of Microbiology.2024; 62(1): 33.     CrossRef
  • Eco-Evolutionary Drivers of Vibrio parahaemolyticus Sequence Type 3 Expansion: Retrospective Machine Learning Approach
    Amy Marie Campbell, Chris Hauton, Ronny van Aerle, Jaime Martinez-Urtaza
    JMIR Bioinformatics and Biotechnology.2024; 5: e62747.     CrossRef
  • Relaxed Cleavage Specificity of Hyperactive Variants of Escherichia coli RNase E on RNA I
    Dayeong Bae, Hana Hyeon, Eunkyoung Shin, Ji-Hyun Yeom, Kangseok Lee
    Journal of Microbiology.2023; 61(2): 211.     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
Characterization of staphylococcal endolysin LysSAP33 possessing untypical domain composition
Jun-Hyeok Yu , Do-Won Park , Jeong-A Lim , Jong-Hyun Park
J. Microbiol. 2021;59(9):840-847.   Published online August 12, 2021
DOI: https://doi.org/10.1007/s12275-021-1242-1
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AbstractAbstract
Endolysin, a peptidoglycan hydrolase derived from bacteriophage, has been suggested as an alternative antimicrobial agent. Many endolysins on staphylococcal phages have been identified and applied extensively against Staphylococcus spp. Among them, LysK-like endolysin, a well-studied staphylococcal endolysin, accounts for most of the identified endolysins. However, relatively little interest has been paid to LysKunlike endolysin and a few of them has been characterized. An endolysin LysSAP33 encoded on bacteriophage SAP33 shared low homology with LysK-like endolysin in sequence by 41% and domain composition (CHAP-unknown CBD). A green fluorescence assay using a fusion protein for Lys- SAP33_CBD indicated that the CBD domain (157-251 aa) was bound to the peptidoglycan of S. aureus. The deletion of LysSAP33_CBD at the C-terminal region resulted in a significant decrease in lytic activity and efficacy. Compared to LysK-like endolysin, LysSAP33 retained its lytic activity in a broader range of temperature, pH, and NaCl concentrations. In addition, it showed a higher activity against biofilms than LysK-like endolysin. This study could be a helpful tool to develop our understanding of staphylococcal endolysins not belonging to LysK-like endolysins and a potential biocontrol agent against biofilms.

Citations

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  • Phage-Derived Endolysins Against Resistant Staphylococcus spp.: A Review of Features, Antibacterial Activities, and Recent Applications
    Mina Golban, Javad Charostad, Hossein Kazemian, Hamid Heidari
    Infectious Diseases and Therapy.2024;[Epub]     CrossRef
  • Molecular Machinery of the Triad Holin, Endolysin, and Spanin: Key Players Orchestrating Bacteriophage-Induced Cell Lysis and their Therapeutic Applications
    Safia Samir
    Protein & Peptide Letters.2024; 31(2): 85.     CrossRef
  • A Novel Truncated CHAP Modular Endolysin, CHAPSAP26-161, That Lyses Staphylococcus aureus, Acinetobacter baumannii, and Clostridioides difficile, and Exhibits Therapeutic Effects in a Mouse Model of A. baumannii Infection
    Yoon-Jung Choi, Shukho Kim, Ram Hari Dahal, Jungmin Kim
    Journal of Microbiology and Biotechnology.2024; 34(8): 1718.     CrossRef
  • Therapeutic potential of bacteriophage endolysins for infections caused by Gram-positive bacteria
    He Liu, Zhen Hu, Mengyang Li, Yi Yang, Shuguang Lu, Xiancai Rao
    Journal of Biomedical Science.2023;[Epub]     CrossRef
  • Endolysin, a Promising Solution against Antimicrobial Resistance
    Mujeeb ur Rahman, Weixiao Wang, Qingqing Sun, Junaid Ali Shah, Chao Li, Yanmei Sun, Yuanrui Li, Bailing Zhang, Wei Chen, Shiwei Wang
    Antibiotics.2021; 10(11): 1277.     CrossRef
Lysobacter arenosi sp. nov. and Lysobacter solisilvae sp. nov. isolated from soil
Kyeong Ryeol Kim† , Kyung Hyun Kim† , Shehzad Abid Khan , Hyung Min Kim , Dong Min Han , Che Ok Jeon
J. Microbiol. 2021;59(8):709-718.   Published online June 1, 2021
DOI: https://doi.org/10.1007/s12275-021-1156-y
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AbstractAbstract
Two Gram-stain negative, yellow-pigmented, and mesophilic bacteria, designated strains R7T and R19T, were isolated from sandy and forest soil, South Korea, respectively. Both strains were non-motile rods showing catalase- and oxidase-positive activities. Both strains were shown to grow at 10–37°C and pH 6.0–9.0, and in the presence of 0–1.5% (w/v) NaCl. Strain R7T contained iso-C14:0, iso-C15:0, iso-C16:0, and summed feature 9 (comprising C16:0 10-methyl and/or iso-C17:1 ω9c), whereas strain R19T contained iso-C11:0 3-OH, C16:1 ω7c alcohol, iso-C11:0, iso-C15:0, iso-C16:0, and summed feature 9 (comprising C16:0 10-methyl and/or iso-C17:1 ω9c) as major cellular fatty acids (> 5%). Both strains contained ubiquinone- 8 as the sole isoprenoid quinone and phosphatidylglycerol, phosphatidylethanolamine, and an unidentified phospholipid as the major polar lipids. The DNA G + C contents of strains R7T and R19T calculated from their genomes were 66.9 mol% and 68.9 mol%, respectively. Strains R7T and R19T were most closely related to Lysobacter panacisoli C8-1T and Lysobacter niabensis GH34-4T with 98.7% and 97.8% 16S rRNA sequence similarities, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains R7T and R19T formed distinct phylogenetic lineages within the genus Lysobacter. Based on phenotypic, chemotaxonomic, and molecular features, strains R7T and R19T represent novel species of the genus Lysobacter, for which the names Lysobacter arenosi sp. nov. and Lysobacter solisilvae sp. nov. are proposed. The type strains of L. arenosi and L. solisilvae are R7T (= KACC 21663T = JCM 34257T) and R19T (= KACC 21767T = JCM 34258T), respectively.

Citations

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  • Luteimonas flava sp. nov. and Aquilutibacter rugosus gen. nov., sp. nov., isolated from freshwater environments in China and re-examining the taxonomic status of genera Luteimonas and Lysobacter
    Huibin Lu, Li Chen, Yujing Wang, Peng Xing, Qinglong Wu
    International Journal of Systematic and Evolutionary Microbiology .2024;[Epub]     CrossRef
  • Saline soil improvement promotes the transformation of microbial salt tolerance mechanisms and microbial-plant-animal ecological interactions
    Keyu Yao, Guanghao Wang, Wen Zhang, Qiang Liu, Jian Hu, Mao Ye, Xin Jiang
    Journal of Environmental Management.2024; 372: 123360.     CrossRef
  • Optimal Irrigation and Fertilization Enhanced Tomato Yield and Water and Nitrogen Productivities by Increasing Rhizosphere Microbial Nitrogen Fixation
    Hongfei Niu, Tieliang Wang, Yongjiang Dai, Mingze Yao, Bo Li, Jiaqi Zheng, Lizhen Mao, Mingyu Zhao, Zhanyang Xu, Feng Zhang
    Agronomy.2024; 14(9): 2111.     CrossRef
  • Short-term effect of reclaimed wastewater quality gradient on soil microbiome during irrigation
    V. Moulia, N. Ait-Mouheb, G. Lesage, J. Hamelin, N. Wéry, V. Bru-Adan, L. Kechichian, M. Heran
    Science of The Total Environment.2023; 901: 166028.     CrossRef
  • Dyadobacter pollutisoli sp. nov., isolated from plastic waste landfill soil
    Kyeong Ryeol Kim, Jeong Min Kim, Jae Kyeong Lee, Dong Min Han, Lujiang Hao, Che Ok Jeon
    International Journal of Systematic and Evolutionary Microbiology .2023;[Epub]     CrossRef
  • Physiological and genomic analyses of cobalamin (vitamin B12)-auxotrophy of Lysobacter auxotrophicus sp. nov., a methionine-auxotrophic chitinolytic bacterium isolated from chitin-treated soil
    Akihiro Saito, Hideo Dohra, Moriyuki Hamada, Ryota Moriuchi, Yohei Kotsuchibashi, Koji Mori
    International Journal of Systematic and Evolutionary Microbiology .2023;[Epub]     CrossRef
  • Nitratireductor rhodophyticola sp. nov., isolated from marine red algae
    Kyung Hyun Kim, Sylvia Kristyanto, Hyung Min Kim, Kyeong Ryeol Kim, Che Ok Jeon
    International Journal of Systematic and Evolutionary Microbiology .2022;[Epub]     CrossRef
  • Description of Corynebacterium poyangense sp. nov., isolated from the feces of the greater white-fronted geese (Anser albifrons)
    Qian Liu, Guoying Fan, Kui Wu, Xiangning Bai, Xi Yang, Wentao Song, Shengen Chen, Yanwen Xiong, Haiying Chen
    Journal of Microbiology.2022; 60(7): 668.     CrossRef
  • Lysobacter ciconiae sp. nov., and Lysobacter avium sp. nov., isolated from the faeces of an Oriental stork
    So-Yeon Lee, Pil Soo Kim, Hojun Sung, Dong-Wook Hyun, Jin-Woo Bae
    Journal of Microbiology.2022; 60(5): 469.     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
  • Rhodococcus oxybenzonivorans sp. nov., a benzophenone-3-degrading bacterium, isolated from stream sediment
    Ju Hye Baek, Woonhee Baek, Sang Eun Jeong, Sung Chul Lee, Hyun Mi Jin, Che Ok Jeon
    International Journal of Systematic and Evolutionary Microbiology.2022;[Epub]     CrossRef
Ganoderma boninense mycelia for phytochemicals and secondary metabolites with antibacterial activity
Syahriel Abdullah , Se-Eun Jang , Min-Kyu Kwak , KhimPhin Chong
J. Microbiol. 2020;58(12):1054-1064.   Published online December 2, 2020
DOI: https://doi.org/10.1007/s12275-020-0208-z
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AbstractAbstract
Antiplasmodial nortriterpenes with 3,4-seco-27-norlanostane skeletons, almost entirely obtained from fruiting bodies, represent the main evidential source for bioactive secondary metabolites derived from a relatively unexplored phytopathogenic fungus, Ganoderma boninense. Currently lacking is convincing evidence for antimicrobial secondary metabolites in this pathogen, excluding that obtained from commonly observed phytochemicals in the plants. Herein, we aimed to demonstrate an efficient analytical approach for the production of antibacterial secondary metabolites using the mycelial extract of G. boninense. Three experimental cultures were prepared from fruiting bodies (GBFB), mycelium cultured on potato dextrose agar (PDA) media (GBMA), and liquid broth (GBMB). Through solvent extraction, culture type-dependent phytochemical distributions were diversely exhibited. Water-extracted GBMB produced the highest yield (31.21 ± 0.61%, p < 0.05), but both GBFB and GBMA elicited remarkably higher yields than GBMB when polar-organic solvent extraction was employed. Greater quantities of phytochemicals were also obtained from GBFB and GBMA, in sharp contrast to those gleaned from GBMB. However, the highest antibacterial activity was observed in chloroform-extracted GBMA against all tested bacteria. From liquid-liquid extractions (LLE), it was seen that mycelia extraction with combined chloroform-methanol-water at a ratio of 1:1:1 was superior at detecting antibacterial activities with the most significant quantities of antibacterial compounds. The data demonstrate a novel means of assessing antibacterial compounds with mycelia by LLE which avoids the shortcomings of standardized
method
ologies. Additionally, the antibacterial extract from the mycelia demonstrate that previously unknown bioactive secondary metabolites of the less studied subsets of Ganoderma may serve as active and potent antimicrobial compounds.

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  • Medium composition optimization and characterization of polysaccharides extracted from Ganoderma boninense along with antioxidant activity
    Qian-Zhu Li, Chuan Xiong, Wei Chee Wong, Li-Wei Zhou
    International Journal of Biological Macromolecules.2024; 260: 129528.     CrossRef
  • Cytotoxic Potential of Diospyros villosa Leaves and Stem Bark Extracts and Their Silver Nanoparticles
    Oluwatosin Temilade Adu, Yougasphree Naidoo, Johnson Lin, Depika Dwarka, John Mellem, Hosakatte Niranjana Murthy, Yaser Hassan Dewir
    Plants.2023; 12(4): 769.     CrossRef
  • The antitumor effect of mycelia extract of the medicinal macrofungus Inonotus hispidus on HeLa cells via the mitochondrial-mediated pathway
    Shao-Jun Tang, Chen-Xia Shao, Yi Yang, Rui Ren, Lei Jin, Dan Hu, Shen-Lian Wu, Pin Lei, Yue-Lin He, Jun Xu
    Journal of Ethnopharmacology.2023; 311: 116407.     CrossRef
  • Impacts of Plant-derived Secondary Metabolites for Improving Flora in Type 2 Diabetes
    Lin Zehao Li, Yan Yan, Qinghe Song, Zhibin Wang, Wei Zhang, Yanli Hou, Xiandang Zhang
    Current Diabetes Reviews.2023;[Epub]     CrossRef
  • Bioactive Compounds of Ganoderma boninense Inhibited Methicillin-Resistant Staphylococcus aureus Growth by Affecting Their Cell Membrane Permeability and Integrity
    Yow-San Chan, Khim-Phin Chong
    Molecules.2022; 27(3): 838.     CrossRef
  • Natural Products Targeting Liver X Receptors or Farnesoid X Receptor
    Jianglian She, Tanwei Gu, Xiaoyan Pang, Yonghong Liu, Lan Tang, Xuefeng Zhou
    Frontiers in Pharmacology.2022;[Epub]     CrossRef
  • Biophysical characterization of antibacterial compounds derived from pathogenic fungi Ganoderma boninense
    Syahriel Abdullah, Yoon Sin Oh, Min-Kyu Kwak, KhimPhin Chong
    Journal of Microbiology.2021; 59(2): 164.     CrossRef
  • Enhanced Accumulation of Betulinic Acid in Transgenic Hairy Roots of Senna obtusifolia Growing in the Sprinkle Bioreactor and Evaluation of Their Biological Properties in Various Biological Models
    Tomasz Kowalczyk, Przemysław Sitarek, Monika Toma, Patricia Rijo, Eva Domínguez‐Martín, Irene Falcó, Gloria Sánchez, Tomasz Śliwiński
    Chemistry & Biodiversity.2021;[Epub]     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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AbstractAbstract
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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  • Bacterial membrane vesicles in the pathogenesis and treatment of inflammatory bowel disease
    Chinasa Valerie Olovo, Dickson Kofi Wiredu Ocansey, Ying Ji, Xinxiang Huang, Min Xu
    Gut Microbes.2024;[Epub]     CrossRef
  • Glycosylphosphatidylinositol-anchored proteins as non- DNA matter of inheritance: from molecular to cell to philosophical biology
    Günter Müller
    Academia Molecular Biology and Genomics.2024;[Epub]     CrossRef
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    Min Xiao, Guiding Li, Hefeng Yang
    Frontiers in Microbiology.2023;[Epub]     CrossRef
  • Wild Wheat Rhizosphere-Associated Plant Growth-Promoting Bacteria Exudates: Effect on Root Development in Modern Wheat and Composition
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Journal Articles
Machine learning methods for microbiome studies
Junghyun Namkung
J. Microbiol. 2020;58(3):206-216.   Published online February 27, 2020
DOI: https://doi.org/10.1007/s12275-020-0066-8
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AbstractAbstract
Researches on the microbiome have been actively conducted worldwide and the results have shown human gut bacterial environment significantly impacts on immune system, psychological conditions, cancers, obesity, and metabolic diseases. Thanks to the development of sequencing technology, microbiome studies with large number of samples are eligible on an acceptable cost nowadays. Large samples allow analysis of more sophisticated modeling using machine learning approaches to study relationships between microbiome and various traits. This article provides an overview of machine learning methods for non-data scientists interested in the association analysis of microbiomes and host phenotypes. Once genomic feature of microbiome is determined, various analysis
methods
can be used to explore the relationship between microbiome and host phenotypes that include penalized regression, support vector machine (SVM), random forest, and artificial neural network (ANN). Deep neural network methods are also touched. Analysis procedure from environment setup to extract analysis results are presented with Python programming language.

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Zur-regulated lipoprotein A contributes to the fitness of Acinetobacter baumannii
Eun Kyung Lee , Chul Hee Choi , Man Hwan Oh
J. Microbiol. 2020;58(1):67-77.   Published online January 2, 2020
DOI: https://doi.org/10.1007/s12275-020-9531-7
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AbstractAbstract
Acinetobacter baumannii is a notorious nosocomial pathogen that commonly infects severely ill patients. Zinc (Zn) is essential to survive and adapt to different environment and host niches in A. baumannii. Of the Zinc uptake regulator (Zur)-regulated genes in A. baumannii, the A1S_3412 gene encoding a Zur-regulated lipoprotein A (ZrlA) is critical for cell envelope integrity and overcoming antibiotic exposure. This study investigated whether ZrlA contributes to the fitness of A. baumannii in vitro and in vivo using the wildtype A. baumannii ATCC 17978, ΔzrlA mutant, and zrlAcomplemented strains. The ΔzrlA mutant showed reduced biofilm formation, surface motility, and adherence to and invasion of epithelial cells compared to the wild-type strain. In a mouse pneumonia model, the ΔzrlA mutant showed significantly lower bacterial numbers in the blood than the wildtype strain. These virulence traits were restored in the zrlAcomplemented strain. Under static conditions, the expression of csuCDE, which are involved in the chaperone-usher pili assembly system, was significantly lower in the ΔzrlA mutant than in the wild-type strain. Moreover, the expression of the bfmR/S genes, which regulate the CsuA/BABCDE system, was significantly lower in the ΔzrlA mutant under static conditions than in the wild-type strain. Our results indicate that the zrlA gene plays a role in the fitness of A. baumannii by regulating the BfmR/S two-component system and subsequently the CsuA/BABCDE chaperone-usher pili assembly system, suggesting it as a potential target for anti-virulence strategies against A. baumannii.

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    Nayeong Kim, Hyo Jeong Kim, Man Hwan Oh, Se Yeon Kim, Mi Hyun Kim, Joo Hee Son, Seung Il Kim, Minsang Shin, Yoo Chul Lee, Je Chul Lee
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Structure of bacterial and eukaryote communities reflect in situ controls on community assembly in a high-alpine lake
Eli Michael S. Gendron , John L. Darcy , Katherinia Hell , Steven K. Schmidt
J. Microbiol. 2019;57(10):852-864.   Published online August 3, 2019
DOI: https://doi.org/10.1007/s12275-019-8668-8
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AbstractAbstract
Recent work suggests that microbial community composition in high-elevation lakes is significantly influenced by microbes entering from upstream terrestrial and aquatic habitats. To test this idea, we conducted 18S and 16S rDNA surveys of microbial communities in a high-alpine lake in the Colorado Rocky Mountains. We compared the microbial community of the lake to water entering the lake and to uphill soils that drain into the lake. Utilizing hydrological and abiotic data, we identified potential factors controlling microbial diversity and community composition. Results show a diverse community entering the lake at the inlet with a strong resemblance to uphill terrestrial and aquatic communities. In contrast, the lake communities (water column and outlet) showed significantly lower diversity and were significantly different from the inlet communities. Assumptions of neutral community assembly poorly predicted community differences between the inlet and lake, whereas “variable selection” and “dispersal limitation” were predicted to dominate. Similarly, the lake communities were correlated with discharge rate, indicating that longer hydraulic residence times limit dispersal, allowing selective pressures within the lake to structure communities. Sulfate and inorganic nitrogen and phosphorus concentrations correlated with community composition, indicating “bottom up” controls on lake community assembly. Furthermore, bacterial community composition was correlated with both zooplankton density and eukaryotic community composition, indicating biotic controls such as “top-down” interactions also contribute to community assembly in the lake. Taken together, these community analyses suggest that deterministic biotic and abiotic selection within the lake coupled with dispersal limitation structures the microbial communities in Green Lake 4.

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    Huan Zhu, Xiong Xiong, Benwen Liu, Guoxiang Liu
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    Maria Bashenkhaeva, Yelena Yeletskaya, Irina Tomberg, Artyom Marchenkov, Lubov Titova, Yuri Galachyants
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Assembly mechanisms of soil bacterial communities in subalpine coniferous forests on the Loess Plateau, China
Pengyu Zhao , Jinxian Liu , Tong Jia , Zhengming Luo , Cui Li , Baofeng Chai
J. Microbiol. 2019;57(6):461-469.   Published online May 27, 2019
DOI: https://doi.org/10.1007/s12275-019-8373-7
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AbstractAbstract
Microbial community assembly is affected by trade-offs between deterministic and stochastic processes. However, the mechanisms underlying the relative influences of the two processes remain elusive. This knowledge gap limits our ability to understand the effects of community assembly processes on microbial community structures and functions. To better understand community assembly mechanisms, the community dynamics of bacterial ecological groups were investigated based on niche breadths in 23 soil plots from subalpine coniferous forests on the Loess Plateau in Shanxi, China. Here, the overall community was divided into the ecological groups that corresponded to habitat generalists, ‘other taxa’ and specialists. Redundancy analysis based on Bray-Curtis distances (db-RDA) and multiple regression tree (MRT) analysis indicated that soil organic carbon (SOC) was a general descriptor that encompassed the environmental gradients by which the communities responded to, because it can explain more significant variations in community diversity patterns. The three ecological groups exhibited different niche optima and degrees of specialization (i.e., niche breadths) along the SOC gradient, suggesting the presence of a gradient in tolerance for environmental heterogeneity. The inferred community assembly processes varied along the SOC gradient, wherein a transition was observed from homogenizing dispersal to variable selection that reflects increasing deterministic processes. Moreover, the ecological groups were inferred to perform different community functions that varied with community composition, structure. In conclusion, these results contribute to our understanding of the trade-offs between community assembly mechanisms and the responses of community structure and function to environmental gradients.

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    Junnan Ding, Shaopeng Yu
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    Zhenming Zhang, Xianliang Wu, Jiachun Zhang, Yingying Liu, Wenmin Luo, Guiting Mou
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Research Support, Non-U.S. Gov'ts
Crystal structure and modeling of the tetrahedral intermediate state of methylmalonate-semialdehyde dehydrogenase (MMSDH) from Oceanimonas doudoroffii
Hackwon Do , Chang Woo Lee , Sung Gu Lee , Hara Kang , Chul Min Park , Hak Jun Kim , Hyun Park , HaJeung Park , Jun Hyuck Lee
J. Microbiol. 2016;54(2):114-121.   Published online February 2, 2016
DOI: https://doi.org/10.1007/s12275-016-5549-2
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AbstractAbstract
The gene product of dddC (Uniprot code G5CZI2), from the Gram-negative marine bacterium Oceanimonas doudoroffii, is a methylmalonate-semialdehyde dehydrogenase (OdoMMSDH) enzyme. MMSDH is a member of the aldehyde dehydrogenase superfamily, and it catalyzes the NADdependent decarboxylation of methylmalonate semialdehyde to propionyl-CoA. We determined the crystal structure of OdoMMSDH at 2.9 Å resolution. Among the twelve molecules in the asymmetric unit, six subunits complexed with NAD, which was carried along the protein purification steps. OdoMMSDH exists as a stable homodimer in solution; each subunit consists of three distinct domains: an NAD-binding domain, a catalytic domain, and an oligomerization domain. Computational modeling studies of the OdoMMSDH structure revealed key residues important for substrate recognition and tetrahedral intermediate stabilization. Two basic residues (Arg103 and Arg279) and six hydrophobic residues (Phe150, Met153, Val154, Trp157, Met281, and Phe449) were found to be important for tetrahedral intermediate binding. Modeling data also suggested that the backbone amide of Cys280 and the side chain amine of Asn149 function as the oxyanion hole during the enzymatic reaction. Our results provide useful insights into the substrate recognition site residues and catalytic mechanism of OdoMMSDH.

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An endophytic Coniochaeta velutina producing broad spectrum antimycotics
Jie Xie , Gary A. Strobel , Tao Feng , Huishuang Ren , Morgan T. Mends , Zeyang Zhou , Brad Geary
J. Microbiol. 2015;53(6):390-397.   Published online May 30, 2015
DOI: https://doi.org/10.1007/s12275-015-5105-5
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AbstractAbstract
An endophyte (PC27-5) was isolated from stem tissue of Western hemlock (Tsuga heterophylla) in a Pacific Northwest temperate rainforest. Phylogenetic analyses, based on ITS- 5.8S rDNA and 18S rDNA sequence data, combined with cultural and morphological analysis showed that endophyte PC27-5 exhibited all characteristics of a fungus identical to Coniochaeta velutina. Furthermore, wide spectrum antimycotics were produced by this endophyte that were active against such plant pathogens as Sclerotinia sclerotiorum, Pythium ultimum, and Verticillium dahliae and lethal to Phythophthora cinnamomi, Pythium ultimum, and Phytophthora palmivora in plate tests. The bioactive components were purified through organic solvent extraction, followed by silica column chromatography, and finally preparative HPLC. The minimum inhibitory concentration of the active fraction to Pythium ultimum, which was gained from preparative HPLC, was 11 ?/ml. UPLC-HRMS analysis showed there were two similar components in the antimycotic fraction. Their molecular formulae were established as C30H22O11 (compound I) and C30H22O10 (compound II) respectively, and preliminary spectral results indicate that they are anthroquinone glycosides. Other non ?biologically active compounds were identified in culture fluids of this fungus by spectral means as emodin and chrysophanol - anthroquinone derivatives. This is the first report that Coniochaeta velutina as an endophyte produces bioactive antifungal components.

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