Journal of Microbiology

Journal Article

The Salmonella enterica EnvE is an Outer Membrane Lipoprotein and Its Gene Expression Leads to Transcriptional Repression of the Virulence Gene msgA: Sinyeon Kim, Yong Heon Lee; J. Microbiol. 2024;62(11):1013-1022. Published online November 15, 2024; DOI: https://doi.org/10.1007/s12275-024-00183-4

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Abstract: The envE gene of Salmonella enterica serovar Typhimurium is encoded within Salmonella Pathogenicity Island-11 (SPI-11) and is located immediately upstream of the virulence gene msgA (macrophage survival gene A) in the same transcriptional orientation. To date, the characteristics and roles of envE remain largely unexplored. In this study, we show that EnvE, a predicted lipoprotein, is localized on the outer membrane using sucrose gradient ultracentrifugation. Under oxidative stress conditions, envE transcription is suppressed, while msgA transcription is induced, indicating an inverse correlation between the mRNA levels of the two neighboring genes. Importantly, inactivation of envE leads to constitutive transcription of msgA regardless of the presence of oxidative stress. Moreover, trans-complementation of the envE mutant with a plasmid-borne envE fails to prevent the induction of msgA transcription, suggesting that envE functions as a cis-regulatory element rather than a trans-acting factor. We further show that both inactivation and complementation of envE confer wild-type levels of resistance to oxidative stress by ensuring the expression of msgA. Our data suggest that the S. enterica envE gene encodes an outer membrane lipoprotein, and its transcription represses msgA expression in a cis-acting manner, probably by transcriptional interference, although the exact molecular details are yet unclear.

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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Abstract: 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.

Journal Articles

Comparative Transcriptomic Analysis of Flagellar‑Associated Genes in Salmonella Typhimurium and Its rnc Mutant: Seungmok Han , Ji-Won Byun , Minho Lee; J. Microbiol. 2024;62(1):33-48. Published online January 5, 2024; DOI: https://doi.org/10.1007/s12275-023-00099-5

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Abstract

Salmonella enterica serovar Typhimurium (S. Typhimurium) is a globally recognized foodborne pathogen that affects both animals and humans. Endoribonucleases mediate RNA processing and degradation in the adaptation of bacteria to environmental changes and have been linked to the pathogenicity of S. Typhimurium. Not much is known about the specific regulatory mechanisms of these enzymes in S. Typhimurium, particularly in the context of environmental adaptation. Thus, this study carried out a comparative transcriptomic analysis of wild-type S. Typhimurium SL1344 and its mutant (Δrnc), which lacks the rnc gene encoding RNase III, thereby elucidating the detailed regulatory characteristics that can be attributed to the rnc gene. Global gene expression analysis revealed that the Δrnc strain exhibited 410 upregulated and 301 downregulated genes (fold-change > 1.5 and p < 0.05), as compared to the wild-type strain. Subsequent bioinformatics analysis indicated that these differentially expressed genes are involved in various physiological functions, in both the wild-type and Δrnc strains. This study provides evidence for the critical role of RNase III as a general positive regulator of flagellar-associated genes and its involvement in the pathogenicity of S. Typhimurium.

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CspA regulates stress resistance, flagellar motility and biofilm formation in Salmonella Enteritidis
Xiang Li, Yan Cui, Xiaohui Sun, Chunlei Shi, Shoukui He, Xianming Shi
Food Bioscience.2025; 66: 106237. CrossRef
Influence of Flagella on Salmonella Enteritidis Sedimentation, Biofilm Formation, Disinfectant Resistance, and Interspecies Interactions
Huixue Hu, Jingguo Xu, Jingyu Chen, Chao Tang, Tianhao Zhou, Jun Wang, Zhuangli Kang
Foodborne Pathogens and Disease.2024;[Epub] CrossRef

Lactobacillus rhamnosus KBL2290 Ameliorates Gut Inflammation in a Mouse Model of Dextran Sulfate Sodium‑Induced Colitis: Woon-ki Kim , Sung-gyu Min , Heeun Kwon , SungJun Park , Min Jung Jo , GwangPyo Ko; J. Microbiol. 2023;61(7):673-682. Published online June 14, 2023; DOI: https://doi.org/10.1007/s12275-023-00061-5

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Abstract

Ulcerative colitis, a major form of inflammatory bowel disease (IBD) associated with chronic colonic inflammation, may be induced via overreactive innate and adaptive immune responses. Restoration of gut microbiota abundance and diversity is important to control the pathogenesis. Lactobacillus spp., well-known probiotics, ameliorate IBD symptoms via various mechanisms, including modulation of cytokine production, restoration of gut tight junction activity and normal mucosal thickness, and alterations in the gut microbiota. Here, we studied the effects of oral administration of Lactobacillus rhamnosus (L. rhamnosus) KBL2290 from the feces of a healthy Korean individual to mice with DSS-induced colitis. Compared to the dextran sulfate sodium (DSS) + phosphate-buffered saline control group, the DSS + L. rhamnosus KBL2290 group evidenced significant improvements in colitis symptoms, including restoration of body weight and colon length, and decreases in the disease activity and histological scores, particularly reduced levels of pro-inflammatory cytokines and an elevated level of anti-inflammatory interleukin-10. Lactobacillus rhamnosus KBL2290 modulated the levels of mRNAs encoding chemokines and markers of inflammation; increased regulatory T cell numbers; and restored tight junction activity in the mouse colon. The relative abundances of genera Akkermansia, Lactococcus, Bilophila, and Prevotella increased significantly, as did the levels of butyrate and propionate (the major short-chain fatty acids). Therefore, oral L. rhamnosus KBL2290 may be a useful novel probiotic.

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Dietary supplementation with proanthocyanidins and rutin alleviates the symptoms of type 2 diabetes mice and regulates gut microbiota
Yue Gao, Binbin Huang, Yunyi Qin, Bing Qiao, Mengfei Ren, Liqing Cao, Yan Zhang, Maozhen Han
Frontiers in Microbiology.2025;[Epub] CrossRef
Probiotics: Shaping the gut immunological responses
Eirini Filidou, Leonidas Kandilogiannakis, Anne Shrewsbury, George Kolios, Katerina Kotzampassi
World Journal of Gastroenterology.2024; 30(15): 2096. CrossRef
Synergistic effects of probiotics with soy protein alleviate ulcerative colitis by repairing the intestinal barrier and regulating intestinal flora
Rentang Zhao, Bingqing Shang, Luyan Sun, Suyuan Lv, Guolong Liu, Qiu Wu, Yue Geng
Journal of Functional Foods.2024; 122: 106514. CrossRef
Lactobacillus gasseri BNR17 and Limosilactobacillus fermentum ABF21069 Ameliorate High Sucrose-Induced Obesity and Fatty Liver via Exopolysaccharide Production and β-oxidation
Yu Mi Jo, Yoon Ji Son, Seul-Ah Kim, Gyu Min Lee, Chang Won Ahn, Han-Oh Park, Ji-Hyun Yun
Journal of Microbiology.2024; 62(10): 907. CrossRef
Immune-Stimulating Potential of Lacticaseibacillus rhamnosus LM1019 in RAW 264.7 Cells and Immunosuppressed Mice Induced by Cyclophosphamide
Yeji You, Sung-Hwan Kim, Chul-Hong Kim, In-Hwan Kim, YoungSup Shin, Tae-Rahk Kim, Minn Sohn, Jeseong Park
Microorganisms.2023; 11(9): 2312. CrossRef

Review

Membrane Proteins as a Regulator for Antibiotic Persistence in Gram‑Negative Bacteria: Jia Xin Yee , Juhyun Kim , Jinki Yeom; J. Microbiol. 2023;61(3):331-341. Published online February 17, 2023; DOI: https://doi.org/10.1007/s12275-023-00024-w

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Abstract

Antibiotic treatment failure threatens our ability to control bacterial infections that can cause chronic diseases. Persister bacteria are a subpopulation of physiological variants that becomes highly tolerant to antibiotics. Membrane proteins play crucial roles in all living organisms to regulate cellular physiology. Although a diverse membrane component involved in persistence can result in antibiotic treatment failure, the regulations of antibiotic persistence by membrane proteins has not been fully understood. In this review, we summarize the recent advances in our understanding with regards to membrane proteins in Gram-negative bacteria as a regulator for antibiotic persistence, highlighting various physiological mechanisms in bacteria.

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Amino Acid and Au(III) Self-Assembled Supramolecular Nanozymes for Antimicrobial Applications
Yunzhu Xu, Dahai Hou, Min Zhao, Tong Zhao, Yong Ma, Yafeng Zhang, Yang Guo, Weiwei Tao, Hui Wang
ACS Applied Nano Materials.2024; 7(19): 22505. CrossRef
PhoPQ-mediated lipopolysaccharide modification governs intrinsic resistance to tetracycline and glycylcycline antibiotics in Escherichia coli
Byoung Jun Choi, Umji Choi, Dae-Beom Ryu, Chang-Ro Lee, Mehrad Hamidian, You-Hee Cho
mSystems.2024;[Epub] CrossRef
Bacterial Regulatory Mechanisms for the Control of Cellular Processes: Simple Organisms’ Complex Regulation
Jin-Won Lee
Journal of Microbiology.2023; 61(3): 273. CrossRef

Journal Articles

Brachybacterium kimchii sp. nov. and Brachybacterium halotolerans subsp. kimchii subsp. nov., isolated from the Korean fermented vegetables, kimchi, and description of Brachybacterium halotolerans subsp. halotolerans subsp. nov.: Yujin Kim , Yeon Bee Kim , Juseok Kim , Joon Yong Kim , Tae Woong Whon , Won-Hyong Chung , Eun-Ji Song , Young-Do Nam , Se Hee Lee , Seong Woon Roh; J. Microbiol. 2022;60(7):678-688. Published online July 4, 2022; DOI: https://doi.org/10.1007/s12275-022-1581-6

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Abstract

Two Gram-stain-positive, oxidase-negative, catalase-positive, and coccus-shaped bacterial strains, designated CBA3104T and CBA3105T, were isolated from kimchi. Strain CBA3104T and CBA3105T grew at 10–35°C (optimum, 25°C and 30°C, respectively), at pH 6.0–8.5 (optimum, pH 6.5), and in the presence of 0–15% (w/v) NaCl (optimum, 5%). A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CBA3104T formed a distinct phylogenetic lineage within the genus Brachybacterium whereas strain CBA3105T was closely positioned with Brachybacterium halotolerans MASK1Z-5T. The 16S rRNA gene sequence similarity between strains CBA3104T and CBA3105T was 99.9%, but ANI and dDDH values between strains CBA3104T and CBA3105T were 93.61% and 51.5%, respectively. Strain CBA3104T showed lower ANI and dDDH values than species delineation against three closely related strains and type species of the genus Brachybacterium, however, strain CBA3105T showed 96.63% ANI value and 69.6% dDDH value with Brachybacterium halotolerans MASK1Z-5T. Among biochemical analysis results, strain CBA3104T could uniquely utilize bromo-succinic acid whereas only strain CBA3105T was positive for alkaline phosphatase and α-fucosidase among two novel strains, closely related strains, and type species of the genus Brachybacterium. Compared with strain CBA3105T and Brachybacterium halotolerans JCM 34339T, strain CBA3105T was differentially positive for acid production of D-arabinose, D-adonitol, and potassium 5-ketogluconate and enzyme activity of β-glucuronidase. Both strains contained menaquinone-7 as the dominant quinone. The cell-wall peptidoglycan of two novel strains contained meso-diaminopimelic acid. The major fatty acids of strains CBA3104T and CBA3105T were anteiso-C15:0, anteiso-C17:0, and iso-C16:0. The major polar lipids of both strains were phosphatidylglycerol and diphosphatidylglycerol. Strain CBA3104T possessed a uniquely higher abundance of tRNA (97 tRNAs) than four Brachybacterium strains used for comparative taxonomic analysis (54–62 tRNAs). Both the CBA3104T and CBA3105T strain harbored various oxidoreductase, transferase, hydrolase, and lyase as strain-specific functional genes compared to closely related strains and Brachybacterium type species. The results of biochemical/physiological, chemotaxonomic, and genomic analyses demonstrated that strains CBA3104T and CBA3105T represent a novel species of the genus Brachybacterium and a novel subspecies of B. halotolerans, respectively, for which the names Brachybacterium kimchii sp. nov. and B. halotolerans subsp. kimchii subsp. nov. are proposed. The type strains of the novel species and the novel subspecies are CBA3104T (= KCCM 43417T = JCM 34759T) and CBA3105T (= KCCM 43418T = JCM 34760T), respectively.

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Metagenomic Insights into the Taxonomic and Functional Features of Traditional Fermented Milk Products from Russia
Alexander G. Elcheninov, Kseniya S. Zayulina, Alexandra A. Klyukina, Mariia K. Kremneva, Ilya V. Kublanov, Tatiana V. Kochetkova
Microorganisms.2023; 12(1): 16. CrossRef
Validation List no. 208. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, George M. Garrity
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Complete Genome Sequence of Brachybacterium sp. Strain NBEC-018, Isolated from Nematode-Infected Potatoes
Ling Chen, Yueying Wang, Nanxi Liu, Lei Zhu, Yong Min, Yimin Qiu, Yuxi Tian, Xiaoyan Liu, David Rasko
Microbiology Resource Announcements.2022;[Epub] CrossRef

Availability of polyamines affects virulence and survival of Neisseria meningitidis: Poonam Kanojiya , Riya Joshi , Sunil D. Saroj; J. Microbiol. 2022;60(6):640-648. Published online April 18, 2022; DOI: https://doi.org/10.1007/s12275-022-1589-y

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Abstract

Neisseria meningitidis is a Gram-negative human-restricted pathogen that asymptomatically resides in the human respiratory tract. Meningococcal meningitis and sepsis both are caused by N. meningitidis. The bacterium must adhere to host epithelial cells in order to colonize effectively. The factors that determine the initial attachment to the host and dispersal, are not well understood. Metabolites released by the host may aid in meningococcal colonization and dissemination. Polyamines are aliphatic polycations that assist in cell survival and proliferation. The virulence properties of N. meningitidis after exposure to polyamines were investigated. Adhesion to nasopharyngeal epithelial cells increased in the presence of spermine. Also, the relative expression of adhesin, pilE increased in the presence of spermine. Further, relative expression of ctrA, ctrB and lipB was upregulated in the presence of spermidine, indicating increased capsule formation. Upregulated capsule synthesis of N. meningitidis in the presence of spermidine allows it to survive in murine macrophages. The study suggests the importance of the extracellular pool of polyamines in promoting virulence in N. meningitidis.

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Epsilon-poly-l-lysine inhibits biofilm formation and aids dispersion in Acinetobacter baumannii
Ujjayni Saha, Sakshi Shinde, Savita Jadhav, Sunil D. Saroj
Medicine in Microecology.2024; 21: 100110. CrossRef
Effect of respiratory tract co-colonizers on initial attachment of Neisseria meningitidis
Poonam Kanojiya, Sunil D. Saroj
Archives of Microbiology.2023;[Epub] CrossRef
Antibiotics modulates the virulence of Neisseria meningitidis by regulating capsule synthesis
Tiyasa Haldar, Riya Joshi, Sunil D. Saroj
Microbial Pathogenesis.2023; 179: 106117. CrossRef

Influences of genetically perturbing synthesis of the typical yellow pigment on conidiation, cell wall integrity, stress tolerance, and cellulase production in Trichoderma reesei: Weixin Zhang , Ning An , Junqi Guo , Zhixing Wang , Xiangfeng Meng , Weifeng Liu; J. Microbiol. 2021;59(4):426-434. Published online January 26, 2021; DOI: https://doi.org/10.1007/s12275-021-0433-0

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Abstract

The prominent protein producing workhorse Trichoderma reesei secretes a typical yellow pigment that is synthesized by a gene cluster including two polyketide synthase encoding genes sor1 and sor2. Two transcription factors (YPR1 and YPR2) that are encoded in the same cluster have been shown to regulate the expression of the sor genes. However, the physiological relevance of the yellow pigment synthesis in T. reesei is not completely clear. In this study, a yellow pigment hyper-producer OEypr1 and three yellow pigment non-producers, OEypr1-sor1, Δypr1, and OEypr2, were constructed. Their phenotypic features in mycelial growth, conidiation, cell wall integrity, stress tolerance, and cellulase production were determined. Whereas hyperproduction of the yellow pigment caused significant defects in all the physiological aspects tested, the non-producers showed similar colony growth, but improved conidiation, maintenance of cell wall integrity, and stress tolerance compared to the control strain. Moreover, in contrast to the severely compromised extracellular cellobiohydrolase production in the yellow pigment hyperproducer, loss of the yellow pigment hardly affected induced cellulase gene expression. Our results demonstrate that interfering with the yellow pigment synthesis constitutes an engineering strategy to endow T. reesei with preferred features for industrial application.

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Co-inoculation of Soybean Seedling with Trichoderma asperellum and Irpex laceratus Promotes the Absorption of Nitrogen and Phosphorus
Zengyuan Tian, Xiaomin Wang, Yanyi Li, Yu Xi, Mengting He, Yuqi Guo
Current Microbiology.2024;[Epub] CrossRef
Small GTPase Rab7 is involved in stress adaptation to carbon starvation to ensure the induced cellulase biosynthesis in Trichoderma reesei
Lin Liu, Zhixing Wang, Yu Fang, Renfei Yang, Yi Pu, Xiangfeng Meng, Weifeng Liu
Biotechnology for Biofuels and Bioproducts.2024;[Epub] CrossRef
TrLys9 participates in fungal development and lysine biosynthesis in Trichoderma reesei
Jinling Lan, Lin Zhang, Jie Gao, Ronglin He
The Journal of General and Applied Microbiology.2023; 69(3): 159. CrossRef
MAPkinases regulate secondary metabolism, sexual development and light dependent cellulase regulation in Trichoderma reesei
Miriam Schalamun, Sabrina Beier, Wolfgang Hinterdobler, Nicole Wanko, Johann Schinnerl, Lothar Brecker, Dorothea Elisa Engl, Monika Schmoll
Scientific Reports.2023;[Epub] CrossRef
C-terminus of serine–arginine protein kinase-like protein, SrpkF, is involved in conidiophore formation and hyphal growth under salt stress in Aspergillus aculeatus
Natsumi Kobayashi, Ryohei Katayama, Kentaro Minamoto, Takashi Kawaguchi, Shuji Tani
International Microbiology.2023; 27(1): 91. CrossRef
Global regulation of fungal secondary metabolism in Trichoderma reesei by the transcription factor Ypr1, as revealed by transcriptome analysis
Jie Yang, Jia-Xiang Li, Fei Zhang, Xin-Qing Zhao
Engineering Microbiology.2023; 3(2): 100065. CrossRef
Dual Regulatory Role of Chromatin Remodeler ISW1 in Coordinating Cellulase and Secondary Metabolite Biosynthesis in Trichoderma reesei
Yanli Cao, Renfei Yang, Fanglin Zheng, Xiangfeng Meng, Weixin Zhang, Weifeng Liu, Xiaorong Lin
mBio.2022;[Epub] CrossRef
Heterologous Expression of Secondary Metabolite Genes in Trichoderma reesei for Waste Valorization
Mary L. Shenouda, Maria Ambilika, Elizabeth Skellam, Russell J. Cox
Journal of Fungi.2022; 8(4): 355. CrossRef
Morphologically favorable mutant of Trichoderma reesei for low viscosity cellulase production
Mukund G. Adsul, Pooja Dixit, Jitendra K. Saini, Ravi P. Gupta, Sankara Sri Venkata Ramakumar, Anshu S. Mathur
Biotechnology and Bioengineering.2022; 119(8): 2167. CrossRef
Identification of a Bidirectional Promoter from Trichoderma reesei and Its Application in Dual Gene Expression
Xiaoxiao Wu, Fuzhe Li, Renfei Yang, Xiangfeng Meng, Weixin Zhang, Weifeng Liu
Journal of Fungi.2022; 8(10): 1059. CrossRef
A histone H3K9 methyltransferase Dim5 mediates repression of sorbicillinoid biosynthesis in Trichoderma reesei
Lei Wang, Jialong Liu, Xiaotong Li, Xinxing Lyu, Zhizhen Liu, Hong Zhao, Xiangying Jiao, Weixin Zhang, Jun Xie, Weifeng Liu
Microbial Biotechnology.2022; 15(10): 2533. CrossRef
Transcriptome Comparison of Secondary Metabolite Biosynthesis Genes Expressed in Cultured and Lichenized Conditions of Cladonia rangiferina
Natalia Sveshnikova, Michele D. Piercey-Normore
Diversity.2021; 13(11): 529. CrossRef
From induction to secretion: a complicated route for cellulase production in Trichoderma reesei
Su Yan, Yan Xu, Xiao-Wei Yu
Bioresources and Bioprocessing.2021;[Epub] CrossRef

Improved tolerance of Escherichia coli to oxidative stress by expressing putative response regulator homologs from Antarctic bacteria: Seo-jeong Park , Sangyong Lim , Jong-il Choi; J. Microbiol. 2020;58(2):131-141. Published online December 23, 2019; DOI: https://doi.org/10.1007/s12275-020-9290-5

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Abstract

Response regulator (RR) is known a protein that mediates cell’s response to environmental changes. The effect of RR from extremophiles was still under investigation. In this study, response regulator homologs were mined from NGS data of Antarctic bacteria and overexpressed in Escherichia coli. Sixteen amino acid sequences were annotated corresponding to response regulators related to the two-component regulatory systems; of these, 3 amino acid sequences (DRH632, DRH1601 and DRH577) with high homology were selected. These genes were cloned in pRadGro and expressed in E. coli. The transformant strains were subjected to various abiotic stresses including oxidative, osmotic, thermal stress, and acidic stress. There was found that the robustness of E. coli to abiotic stress was increased in the presence of these response regulator homologs. Especially, recombinant E. coli overexpressing drh632 had the highest survival rate in oxidative, hypothermic, osmotic, and acidic conditions. Recombinant E. coli overexpressing drh1601 showed the highest tolerance level to osmotic stress. These results will be applicable for development of recombinant strains with high tolerance to abiotic stress.

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Deionococcus proteotlycius Genomic Library Exploration Enhances Oxidative Stress Resistance and Poly-3-hydroxybutyrate Production in Recombinant Escherichia coli
Seul-Ki Yang, Soyoung Jeong, Inwoo Baek, Jong-il Choi, Sangyong Lim, Jong-Hyun Jung
Microorganisms.2023; 11(9): 2135. CrossRef
Bacterial redox response factors in the management of environmental oxidative stress
Sudharsan M, Rajendra Prasad N, Saravanan Rajendrasozhan
World Journal of Microbiology and Biotechnology.2023;[Epub] CrossRef
Bacteriophages as Antimicrobial Agents? Proteomic Insights on Three Novel Lytic Bacteriophages Infecting ESBL-Producing Escherichia coli
Sadika Dkhili, Miguel Ribeiro, Salma Ghariani, Houssem Ben Yahia, Mélanie Hillion, Patricia Poeta, Karim Ben Slama, Michel Hébraud, Gilberto Igrejas
OMICS: A Journal of Integrative Biology.2021; 25(10): 626. CrossRef
Regulator of ribonuclease activity modulates the pathogenicity of Vibrio vulnificus
Jaejin Lee, Eunkyoung Shin, Jaeyeong Park, Minho Lee, Kangseok Lee
Journal of Microbiology.2021; 59(12): 1133. CrossRef

The NADP+-dependent glutamate dehydrogenase Gdh1 is subjected to glucose starvation-induced reversible aggregation that affects stress resistance in yeast: Woo Hyun Lee , Ju Yeong Oh , Pil Jae Maeng; J. Microbiol. 2019;57(10):884-892. Published online August 3, 2019; DOI: https://doi.org/10.1007/s12275-019-9065-z

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Abstract

The yeast Saccharomyces cerevisiae has two isoforms of NADP+-dependent glutamate dehydrogenase (Gdh1 and Gdh3) that catalyze the synthesis of glutamate from α-ketoglutarate and NH4 +. In the present study, we confirmed that Gdh3, but not Gdh1, mainly contributes to the oxidative stress resistance of stationary-phase cells and found evidence suggesting that the insignificance of Gdh1 to stress resistance is possibly resulted from conditional and reversible aggregation of Gdh1 into punctuate foci initiated in parallel with postdiauxic growth. Altered localization to the mitochondria or peroxisomes prevented Gdh1, which was originally localized in the cytoplasm, from stationary phase-specific aggregation, suggesting that some cytosolic factors are involved in the process of Gdh1 aggregation. Glucose starvation triggered the transition of the soluble form of Gdh1 into the insoluble aggregate form, which could be redissolved by replenishing glucose, without any requirement for protein synthesis. Mutational analysis showed that the N-terminal proximal region of Gdh1 (NTP1, aa 21-26, TLFEQH) is essential for glucose starvation-induced aggregation. We also found that the substitution of NTP1 with the corresponding region of Gdh3 (NTP3) significantly increased the contribution of the mutant Gdh1 to the stress resistance of stationary-phase cells. Thus, this suggests that NTP1 is responsible for the negligible role of Gdh1 in maintaining the oxidative stress resistance of stationary- phase cells and the stationary phase-specific stresssensitive phenotype of the mutants lacking Gdh3.

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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
Effects of Molecular Crowding and Betaine on HSPB5 Interactions, with Target Proteins Differing in the Quaternary Structure and Aggregation Mechanism
Vera A. Borzova, Svetlana G. Roman, Anastasiya V. Pivovarova, Natalia A. Chebotareva
International Journal of Molecular Sciences.2022; 23(23): 15392. CrossRef

Review

REVIEW] Antibacterial strategies inspired by the oxidative stress and response networks: So Youn Kim , Chanseop Park , Hye-Jeong Jang , Bi-o Kim , Hee-Won Bae , In-Young Chung , Eun Sook Kim , You-Hee Cho; J. Microbiol. 2019;57(3):203-212. Published online February 26, 2019; DOI: https://doi.org/10.1007/s12275-019-8711-9

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Abstract

Oxidative stress arises from an imbalance between the excessive accumulation of reactive oxygen species (ROS) and a cell’s capability to readily detoxify them. Although ROS are spontaneously generated during the normal oxygen respiration and metabolism, the ROS generation is usually augmented by redox-cycling agents, membrane disrupters, and bactericidal antibiotics, which contributes their antimicrobial bioactivity. It is noted that all the bacteria deploy an arsenal of inducible antioxidant defense systems to cope with the devastating effect exerted by the oxidative stress: these systems include the antioxidant effectors such as catalases and the master regulators such as OxyR. The oxidative stress response is not essential for normal growth, but critical to survive the oxidative stress conditions that the bacterial pathogens may encounter due to the host immune response and/or the antibiotic treatment. Based on these, we here define the ROS-inspired antibacterial strategies to enhance the oxidative stress of ROS generation and/or to compromise the bacterial response of ROS detoxification, by delineating the ROSgenerating antimicrobials and the core concept of the bacterial response against the oxidative stress.

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H2O2 Self‐Supplying CaO2/POM@MOF Bimodal Nanogeneration Materials for Photothermal and Chemodynamic Synergistic Antimicrobials
Na Chen, Yuan Li, Yang Pan, Haozhe Wang, Hao Gu, Yuan Sun, Tiedong Sun
Applied Organometallic Chemistry.2025;[Epub] CrossRef
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Dharma Raj Kandel, Donggyu Kwak, Somin Lee, Yu Jie Lim, Subhangi Subedi, Jaewoo Lee
Separation and Purification Technology.2025; 359: 130254. CrossRef
Antimicrobial effects and mechanistic exploration of micronized mgh2 particles against common oral pathogenic bacteria
Qianqian Zhang, Yuxiao Chen, Qian Jiang, Baiyan Sui, Dingcheng Rao, Jiaxuan Wang, Guangyin Yuan, Xin Liu
Applied Materials Today.2025; 42: 102567. CrossRef
Juxtaposing the antibacterial activities of different ZIFs in photodynamic therapy and their oxidative stress approach
Ruth Antwi-Baah, Mirabel Ewura Esi Acquah, Malcom Frimpong Dapaah, Xiaoqin Chen, Joojo Walker, Heyang Liu
Colloids and Surfaces B: Biointerfaces.2025; 247: 114397. CrossRef
Understanding the antibacterial effects of incorporating chlorin e6-loaded zeolitic imidazolate framework-8 with cerium and polydopamine
Ruth Antwi-Baah, Mirabel Ewura Esi Acquah, Malcom Frimpong Dapaah, Yajing Wang, Xiaoqin Chen, Joojo Walker, Heyang Liu
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Journal Articles

Astragaloside IV reversed the autophagy and oxidative stress induced by the intestinal microbiota of AIS in mice: Nan Xu , Pengcheng Kan , Xiuhua Yao , Ping Yang , Jiwei Wang , Lei Xiang , Yu Zhu; J. Microbiol. 2018;56(11):838-846. Published online October 24, 2018; DOI: https://doi.org/10.1007/s12275-018-8327-5

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Abstract

Acute ischaemic stroke (AIS) seriously affects patient quality of life. We explored the role of the intestinal microbiota on oxidative stress and autophagy in stroke, and Astragaloside IV (AS-IV) reversed the changes induced by intestinal microbiota. We determined the characteristics of the intestinal microbiota of AIS and transient ischaemic attack (TIA) patients by 16S sequencing and found that the structure and diversity of the intestinal microbiota in patients with AIS and TIA were significantly different from those in healthy subjects. Specifically, the abundance of genus Bifidobacterium, Megamonas, Blautia, Holdemanella, and Clostridium, content of homocysteine and triglyceride was increased significantly, thus it may be as a potential mechanism of AIS and TIA. Furthermore, germ-free mice were infused intracolonically with fecal supernatants of TIA and AIS with/without feed AS-IV for 12 weeks, and we found that the feces of AIS up-regulated the autophagy markers Beclin-1, light chain 3 (LC3)-II and autophagy-related gene (Atg)12, and the expression of reactive oxygen species (ROS) and NADPH oxidase 2/4 (NOX2/4), malondialdehyde (MDA), however, the expression of total antioxidant capacity (T-AOC) and activity of superoxide dismutase (SOD) and glutathione (GSH) was down-regulated in brain tissue, the content of homocysteine and free fatty acids (FFA) in serum of the mice. Meanwhile, AS-IV could reverse the above phenomenon, however, it does not affect the motor function of mice. AS-IV reversed these changes and it may be a potential drug for AIS therapeutics.

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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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ZntR positively regulates T6SS4 expression in Yersinia pseudotuberculosis: Tietao Wang , Keqi Chen , Fen Gao , Yiwen Kang , Muhammad Tausif Chaudhry , Zhuo Wang , Yao Wang , Xihui Shen; J. Microbiol. 2017;55(6):448-456. Published online March 10, 2017; DOI: https://doi.org/10.1007/s12275-017-6540-2

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Abstract

The type VI secretion system (T6SS) is a widespread and versatile protein secretion system found in most Gram- negative bacteria. Studies of T6SS have mainly focused on its role in virulence toward host cells and inter-bacterial inter-actions, but studies have also shown that T6SS4 in Yersinia pseudotuberculosis participates in the acquisition of zinc ions to alleviate the accumulation of hydroxyl radicals induced by multiple stressors. Here, by comparing the gene expression patterns of wild-type and zntR mutant Y. pseudotubercu-losis cells using RNA-seq analysis, T6SS4 and 17 other bio-logical processes were found to be regulated by ZntR. T6SS4 was positively regulated by ZntR in Y. pseudotuberculosis, and further investigation demonstrated that ZntR regulates T6SS4 by directly binding to its promoter region. T6SS4 ex-pression is regulated by zinc via ZntR, which maintains in-tracellular zinc homeostasis and controls the concentration of reactive oxygen species to prevent bacterial death under oxidative stress. This study provides new insights into the regulation of T6SS4 by a zinc-dependent transcriptional regu-lator, and it provides a foundation for further investigation of the mechanism of zinc transport by T6SS.

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Kai-Wei Yu, Peng Xue, Yang Fu, Liang Yang
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Research Support, Non-U.S. Gov't

Photosynthetic inhibition and oxidative stress to the toxic Phaeocystis globosa caused by a diketopiperazine isolated from products of algicidal bacterium metabolism: Shuo Tan , Xiaoli Hu , Pinghe Yin , Ling Zhao; J. Microbiol. 2016;54(5):364-375. Published online April 20, 2016; DOI: https://doi.org/10.1007/s12275-016-6012-0

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Abstract

Algicidal bacteria have been turned out to be available for inhibiting Phaeocystis globosa which frequently caused harmful algal blooms and threatened to economic development and ecological balance. A marine bacterium Bacillus sp. Ts-12 exhibited significant algicidal activity against P. globosa by indirect attack. In present study, an algicidal compound was isolated by silica gel column, Sephadex G-15 column and HPLC, further identified as hexahydropyrrolo[1,2-a]pyrazine- 1,4-dione, cyclo-(Pro-Gly), by GC-MS and 1H-NMR. Cyclo-(Pro-Gly) significantly increased the level of reactive oxygen species (ROS) within P. globosa cells, further activating the enzymatic and non-enzymatic antioxidant systems, including superoxide dismutase (SOD), catalase (CAT), glutathione (GSH) and ascorbic acid (AsA). The increase in methane dicarboxylic aldehyde (MDA) content showed that the surplus ROS induced lipid peroxidation on membrane system. Transmission electron microscope (TEM) and flow cytometry (FCM) analysis revealed that cyclo-(Pro-Gly) caused reduction of Chl-a content, destruction of cell membrane integrity, chloroplasts and nuclear structure. Real-time PCR assay showed that the transcriptions of photosynthesis related genes (psbA, psbD, rbcL) were significantly inhibited. This study indicated that cyclo-(Pro-Gly) from marine Bacillus sp. Ts-12 exerted photosynthetic inhibition and oxidative stress to P. globosa and eventually led to the algal cells lysis. This algicidal compound might be potential bio-agent for controlling P. globosa red tide.

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