Journal of Microbiology

Reviews

Targeting innate immune sensors for therapeutic strategies in infectious diseases: Seyun Shin, Young Ki Choi, SangJoon Lee; J. Microbiol. 2025;63(6):e2503009. Published online June 30, 2025; DOI: https://doi.org/10.71150/jm.2503009

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Abstract PDF: The innate immune system relies on innate immune sensors, such as pattern recognition receptors (PRRs), to detect pathogens and initiate immune responses, crucial for controlling infections but also implicated in inflammatory diseases. These innate immune sensors, including Toll-like receptors (TLRs), nod-like receptors (NLRs), RIG-I-like receptors (RLRs), absent in melanoma 2 (AIM2), and Z-DNA binding protein 1 (ZBP1) trigger signaling pathways that produce cytokines, modulating inflammation and cell death. Traditional therapies focus on directly targeting pathogens; however, host-targeting therapeutic strategies have emerged as innovative approaches to modulate innate immune sensor activity. These strategies aim to fine-tune the immune response, either enhancing antiviral defenses or mitigating hyperinflammation to prevent tissue damage. This review explores innate immune sensor-based therapeutic approaches, including inhibitors, agonists, and antagonists, that enhance antiviral defense or suppress harmful inflammation, highlighting innate immune sensors as promising targets in infectious and inflammatory disease treatment.

Microbiome-Mucosal Immunity Nexus: Driving Forces in Respiratory Disease Progression: Young Chae Park, Soo Yeon Choi, Yunah Cha, Hyeong Won Yoon, Young Min Son; J. Microbiol. 2024;62(9):709-725. Published online September 6, 2024; DOI: https://doi.org/10.1007/s12275-024-00167-4

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The importance of the complex interplay between the microbiome and mucosal immunity, particularly within the respiratory tract, has gained significant attention due to its potential implications for the severity and progression of lung diseases. Therefore, this review summarizes the specific interactions through which the respiratory tract-specific microbiome influences mucosal immunity and ultimately impacts respiratory health. Furthermore, we discuss how the microbiome affects mucosal immunity, considering tissue-specific variations, and its capacity in respiratory diseases containing asthma, chronic obstructive pulmonary disease, and lung cancer. Additionally, we investigate the external factors which affect the relationship between respiratory microbiome and mucosal immune responses. By exploring these intricate interactions, this review provides valuable insights into the potential for microbiome-based interventions to modulate mucosal immunity and alleviate the severity of respiratory diseases.

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The impact of environmental factors on respiratory tract microbiome and respiratory system diseases
Yutao Ge, Guo Tang, Yawen Fu, Peng Deng, Rong Yao
European Journal of Medical Research.2025;[Epub] CrossRef
Meta-transcriptomics Reveals Dysbiosis of the Respiratory Microbiome in Older Adults with Long COVID
Meng’en Liao, Jianpeng Cai, Feng Zhu, Yuanbo Lan, Tianqi Xu, Jingxin Guo, Quanlin Xue, Yilong Wen, Fan Zou, Yu Zhang, Shiliang Zhang, Yan Yan, Jingwen Ai, Jie Cui, Wenhong Zhang
Research.2025;[Epub] CrossRef
Lactobacillus salivarius HHuMin-U attenuates vulvovaginal candidiasis via vaginal epithelial immune enhancement mediated by NF-κB activation
Juwon Choi, Jay-Young Jo, Ji Su Lee, Joe Eun Son, Sun Young Kim, Hye Eun Lee, Yeong-Je Seong, Keon Heo, Yongbaek Kim, Myeong Soo Park, Sanguine Byun
New Biotechnology.2025; 90: 36. CrossRef
Bacteria and fungi of the lung: allies or enemies?
Enrico Garaci, Marilena Pariano, Emilia Nunzi, Claudio Costantini, Marina Maria Bellet, Cinzia Antognelli, Matteo Antonio Russo, Luigina Romani
Frontiers in Pharmacology.2024;[Epub] CrossRef

Balancing Act of the Intestinal Antimicrobial Proteins on Gut Microbiota and Health: Ye Eun Ra, Ye‑Ji Bang; J. Microbiol. 2024;62(3):167-179. Published online April 17, 2024; DOI: https://doi.org/10.1007/s12275-024-00122-3

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Abstract PDF

The human gut houses a diverse and dynamic microbiome critical for digestion, metabolism, and immune development, exerting profound efects on human health. However, these microorganisms pose a potential threat by breaching the gut barrier, entering host tissues, and triggering infections, uncontrolled infammation, and even sepsis. The intestinal epithelial cells form the primary defense, acting as a frontline barrier against microbial invasion. Antimicrobial proteins (AMPs), produced by these cells, serve as innate immune efectors that regulate the gut microbiome by directly killing or inhibiting microbes. Abnormal AMP production, whether insufcient or excessive, can disturb the microbiome equilibrium, contributing to various intestinal diseases. This review delves into the complex interactions between AMPs and the gut microbiota and sheds light on the role of AMPs in governing host-microbiota interactions. We discuss the function and mechanisms of action of AMPs, their regulation by the gut microbiota, microbial evasion strategies, and the consequences of AMP dysregulation in disease. Understanding these complex interactions between AMPs and the gut microbiota is crucial for developing strategies to enhance immune responses and combat infections within the gut microbiota. Ongoing research continues to uncover novel aspects of this intricate relationship, deepening our understanding of the factors shaping gut health. This knowledge has the potential to revolutionize therapeutic interventions, ofering enhanced treatments for a wide range of gut-related diseases.

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Host-directed therapies modulating innate immunity against infection in hematologic malignancies
Qiong Wang, Kristján Hermannsson, Egill Másson, Peter Bergman, Guðmundur Hrafn Guðmundsson
Blood Reviews.2025; 70: 101255. CrossRef
Progress in the Identification and Design of Novel Antimicrobial Peptides Against Pathogenic Microorganisms
Shengwei Sun
Probiotics and Antimicrobial Proteins.2025; 17(2): 918. CrossRef
Comparison of naturalization mouse model setups uncover distinct effects on intestinal mucosa depending on microbial experience
Henriette Arnesen, Signe Birkeland, Harriet Stendahl, Klaus Neuhaus, David Masopust, Preben Boysen, Harald Carlsen
Discovery Immunology.2025;[Epub] CrossRef
Oral administration of LEAP2 enhances immunity against Edwardsiella tarda through regulation of gut bacterial community and metabolite in mudskipper
Ting-Fang Zhu, Hai-Peng Guo, Li Nie, Jiong Chen
Fish & Shellfish Immunology.2025; 158: 110128. CrossRef
Pharmacology of Intestinal Inflammation and Repair
Céline Deraison, Nathalie Vergnolle
Annual Review of Pharmacology and Toxicology .2025; 65(1): 301. CrossRef
Microbiome dysbiosis in SARS-CoV-2 infection: implication for pathophysiology and management strategies of COVID-19
Shukur Wasman Smail, Niaz Albarzinji, Rebaz Hamza Salih, Kalthum Othman Taha, Sarah Mousa Hirmiz, Hero M. Ismael, Marwa Fateh Noori, Sarkar Sardar Azeez, Christer Janson
Frontiers in Cellular and Infection Microbiology.2025;[Epub] CrossRef
Harnessing the Microbiome: CRISPR-Based Gene Editing and Antimicrobial Peptides in Combating Antibiotic Resistance and Cancer
Radwa A. Amen, Yaser M. Hassan, Rawan A. Essmat, Rana H. Ahmed, Marwan M. Azab, Nadia R. Shehata, Mariam M. Elgazzar, Wael M. El-Sayed
Probiotics and Antimicrobial Proteins.2025; 17(4): 1938. CrossRef
The Role of Functional Feed in Modulating Fish Gut Microbiome to Enhance Resistance Against Aquaculture Pathogens
Eswar Marcharla, A Vishnuprasadh, Lalitha Gnanasekaran, Saranya Vinayagam, Thanigaivel Sundaram, Swamynathan Ganesan
Probiotics and Antimicrobial Proteins.2025;[Epub] CrossRef
Metabolic profiling and genetic tool development in the mucosal bacterium Selenomonas sputigena
Trinh Thi Nguyen, Yu-Kyung Kim, Trang Vu Thien Nguyen, Junbeom Kwon, Ye-Ji Bang
Genes & Genomics.2025; 47(10): 997. CrossRef
Impact of the COVID-19 pandemic on vancomycin-resistant Enterococcus bloodstream infections: a 6-year study in Western Greece
Maria Lagadinou, Christos Michailides, Christodoulos Chatzigrigoriadis, Ioannis Erginousakis, Prodromos Avramidis, Marina Amerali, Fotini Tasouli, Anna Chondroleou, Katerina Skintzi, Anastasia Spiliopoulou, Fevronia Kolonitsiou, Leonidia Leonidou, Stelios
Frontiers in Microbiology.2025;[Epub] CrossRef
Modeling gut inflammation using intestinal organoids: Advances, challenges, and future perspectives
Justina Guzauskiene, Deimante Valentelyte, Goda Butaite, Ugne Kulokiene, Viltaute Laukaitiene, Ruta Inciuraite, Jurgita Skieceviciene
Best Practice & Research Clinical Gastroenterology.2025; : 102048. CrossRef
Rational bioengineering of polysaccharide in designing of microbiome modulation
Jeong Hyun Moon, Kidong Kim, Yubin Kim, Sejin Son
Trends in Biotechnology.2025;[Epub] CrossRef
Macrophages and Gut Barrier Function: Guardians of Gastrointestinal Health in Post-Inflammatory and Post-Infection Responses
Edward Xiangtai Meng, George Nicholas Verne, Qiqi Zhou
International Journal of Molecular Sciences.2024; 25(17): 9422. CrossRef
Host-Associated Microbiome
Woo Jun Sul
Journal of Microbiology.2024; 62(3): 135. CrossRef
Gut Microbiota as Emerging Players in the Development of Alcohol-Related Liver Disease
Wei Li, Wenkang Gao, Shengqi Yan, Ling Yang, Qingjing Zhu, Huikuan Chu
Biomedicines.2024; 13(1): 74. CrossRef

MAPK Cascades in Plant Microbiota Structure and Functioning: Thijs Van Gerrewey, Hoo Sun Chung; J. Microbiol. 2024;62(3):231-248. Published online April 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00114-3

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Abstract PDF

Mitogen-activated protein kinase (MAPK) cascades are highly conserved signaling modules that coordinate diverse biological processes such as plant innate immunity and development. Recently, MAPK cascades have emerged as pivotal regulators of the plant holobiont, infuencing the assembly of normal plant microbiota, essential for maintaining optimal plant growth and health. In this review, we provide an overview of current knowledge on MAPK cascades, from upstream perception of microbial stimuli to downstream host responses. Synthesizing recent fndings, we explore the intricate connections between MAPK signaling and the assembly and functioning of plant microbiota. Additionally, the role of MAPK activation in orchestrating dynamic changes in root exudation to shape microbiota composition is discussed. Finally, our review concludes by emphasizing the necessity for more sophisticated techniques to accurately decipher the role of MAPK signaling in establishing the plant holobiont relationship.

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The microbiome orchestrates contaminant low-dose phytostimulation
Evgenios Agathokleous, Edward J. Calabrese, Stavros D. Veresoglou
Trends in Plant Science.2025; 30(5): 515. CrossRef
Lipid transfer protein VAS inhibits the hypersensitive response via reactive oxygen species signaling in Nicotiana benthamiana
Rina Koyama, Akira Suzuki, Kouhei Ohnishi, Yasufumi Hikichi, Akinori Kiba, Stefanie Ranf
Journal of Experimental Botany.2025; 76(4): 1285. CrossRef
Short-Term Fertilization with the Nitrogen-Fixing Bacterium (NFB) Kosakonia radicincitans GXGL-4A Agent Can Modify the Transcriptome Expression Profiling of Cucumber (Cucumis sativus L.) Root
Baoyun Feng, Erxing Wang, Yating Zhang, Lurong Xu, Yanwen Xue, Yunpeng Chen
Microorganisms.2025; 13(3): 506. CrossRef
Genome-wide identification and unveiling the role of MAP kinase cascade genes involved in sugarcane response to abiotic stressors
Ahmad Ali, Xue-Ting Zhao, Ji-Shan Lin, Ting-Ting Zhao, Cui-Lian Feng, Ling Li, Rui-Jie Wu, Qi-Xing Huang, Hong-Bo Liu, Jun-Gang Wang
BMC Plant Biology.2025;[Epub] CrossRef
Comparative transcriptome and co-expression network reveals key genes associated with mesocotyl elongation in foxtail millet (Setaria italica)
Meiqiang Yin, Mengyao An, Yuxin Gao, Jianjun Guo, Chongyue Wang, Yanjie Wen, Mingjing Huang, Juan Zhao, Yinyuan Wen
Environmental and Experimental Botany.2025; 234: 106144. CrossRef
Comparative transcriptomic analysis and genome-wide identification provide insights into the potential role of fungal-responsive MAPK cascade genes in tanshinone accumulation in Salvia miltiorrohiza
Ann Abozeid, Xinru Du, Lan Zhang, Furui Yang, Jianxiong Wu, Lin Zhang, Qi Cui, Zongqi Yang, Dongfeng Yang
Frontiers in Plant Science.2025;[Epub] CrossRef
Characteristics of the MAPK gene family in Zizania latifolia and MAPK3 role in response to fungal pathogen infection
Lijun Xu, Pengfei Guo, Yong Kuang, Ke Su, Keling Hu, Defang Gan
Journal of Genetics.2025;[Epub] CrossRef
Chitosan oligosaccharide regulates host defense in pepper plants against cucumber mosaic virus
Jing Shi, Lele Li, Hao Zhou, Jialian Su, Song Bai, Miao Li, Jianta Wang, Lei Tang
Pesticide Biochemistry and Physiology.2025; 215: 106654. CrossRef
Unlocking the leaf microcosm: Ecological dynamics, functional roles, and implications for sustainable agriculture
Hassan Etesami, Umarov Otabek, Bafayeva Zahro, To'rayeva Nargiza, Ochilova Muyassar
Physiological and Molecular Plant Pathology.2025; 139: 102841. CrossRef
Pharmacological effects and the related mechanism of scutellarin on inflammation-related diseases: a review
Yang Zhou, Chenlin Gu, Yan Zhu, Yuting Zhu, Yutong Chen, Li Shi, Yang Yang, Xin Lu, Hanqing Pang
Frontiers in Pharmacology.2024;[Epub] CrossRef
Rice E3 ubiquitin ligases: From key modulators of host immunity to potential breeding applications
Yuqing Yan, Hui Wang, Yan Bi, Fengming Song
Plant Communications.2024; 5(12): 101128. CrossRef
Host-Associated Microbiome
Woo Jun Sul
Journal of Microbiology.2024; 62(3): 135. CrossRef

Journal Articles

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

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

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

Vibrio vulnificus PlpA facilitates necrotic host cell death induced by the pore forming MARTX toxin: Changyi Cho , Sanghyeon Choi , Myung Hee Kim , Byoung Sik Kim; J. Microbiol. 2022;60(2):224-233. Published online February 1, 2022; DOI: https://doi.org/10.1007/s12275-022-1448-x

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Opportunistic pathogen Vibrio vulnificus causes severe systemic infection in humans with high mortality. Although multiple exotoxins have been characterized in V. vulnificus, their interactions and potential synergistic roles in pathogen-induced host cell death have not been investigated previously. By employing a series of multiple exotoxin deletion mutants, we investigated whether specific exotoxins of the pathogen functioned together to achieve severe and rapid necrotic cell death. Human epithelial cells treated with V. vulnificus with a plpA deletion background exhibited an unusually prolonged cell blebbing, suggesting the importance of PlpA, a phospholipase A2, in rapid necrotic cell death by this pathogen. Additional deletion of the rtxA gene encoding the multifunctional autoprocessing repeats-in-toxin (MARTX) toxin did not result in necrotic cell blebs. However, if the rtxA gene was engineered to produce an effector-free MARTX toxin, the cell blebbing was observed, indicating that the pore forming activity of the MARTX toxin is sufficient, but the MARTX toxin effector domains are not necessary, for the blebbing. When a recombinant PlpA was treated on the blebbed cells, the blebs were completely disrupted. Consistent with this, MARTX toxin-pendent rapid release of cytosolic lactate dehydrogenase was significantly delayed in the plpA deletion background. Mutations in other exotoxins such as elastase, cytolysin/hemolysin, and/or extracellular metalloprotease did not affect the bleb formation or disruption. Together, these findings indicate that the pore forming MARTX toxin and the phospholipase A2, PlpA, cooperate sequentially to achieve rapid necrotic cell death by inducing cell blebbing and disrupting the blebs, respectively.

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Genome-wide phenotypic profiling of transcription factors and identification of novel targets to control the virulence of Vibrio vulnificus
Dayoung Sung, Garam Choi, Minji Ahn, Hokyung Byun, Tae Young Kim, Hojun Lee, Zee-Won Lee, Ji Yong Park, Young Hyun Jung, Ho Jae Han, Sang Ho Choi
Nucleic Acids Research.2025;[Epub] CrossRef
Differential expressed genes (DEGs) and differential alternative splicing genes (DASs) revealed the common pathologic mechanism of three bacterial pathogens to American eels (Anguilla rostrata)
Zihao Chen, Guanghua Sun, Songlin Guo
Aquaculture Reports.2025; 40: 102632. CrossRef
Implication of environmental factors on the pathogenicity of Vibrio vulnificus: Insights into gene activation and disease outbreak
Aswathi Bharathan, Yaser Arafath, Aifa Fathima, Saqib Hassan, Prabhakar Singh, George Seghal Kiran, Joseph Selvin
Microbial Pathogenesis.2025; 204: 107591. CrossRef
Non-Repeat Segment 1 in Vibrio vulnificus MARTX toxin, which binds to biantennary N-glycans, is essential for host cell blebbing but dispensable for effector translocation
Jieun Lee, Yunjeong Kim, Byoung Sik Kim
Microbiological Research.2025; 295: 128108. CrossRef
The clinical characteristics and diagnostic and treatment protocol for 14 acute Vibrio vulnificus infections caused by aquatic products
Donghua Ma, Jinjun Wang, Baoying Fan, Jianji Liang, Qing Liu, Zhiyong He
Medicine.2025; 104(34): e43942. CrossRef
Vibrio-infecting bacteriophages and their potential to control biofilm
Ana Cevallos-Urena, Jeong Yeon Kim, Byoung Sik Kim
Food Science and Biotechnology.2023; 32(12): 1719. CrossRef
Pathogenic Mechanism of Vibrio Vulnificus Infection
Kun Lu, Yang Li, Rui Chen, Hua Yang, Yong Wang, Wei Xiong, Fang Xu, Qijun Yuan, Haihui Liang, Xian Xiao, Renqiang Huang, Zhipeng Chen, Chunou Tian, Songqing Wang
Future Microbiology.2023; 18(6): 373. CrossRef
Functional conservation of specialized ribosomes bearing genome-encoded variant rRNAs in Vibrio species
Younkyung Choi, Eunkyoung Shin, Minho Lee, Ji-Hyun Yeom, Kangseok Lee, Bashir Sajo Mienda
PLOS ONE.2023; 18(12): e0289072. CrossRef
Complex regulatory networks of virulence factors in Vibrio vulnificus
Garam Choi, Sang Ho Choi
Trends in Microbiology.2022; 30(12): 1205. CrossRef
MARTX toxin of Vibrio vulnificus induces RBC phosphatidylserine exposure that can contribute to thrombosis
Han Young Chung, Yiying Bian, Kyung-Min Lim, Byoung Sik Kim, Sang Ho Choi
Nature Communications.2022;[Epub] CrossRef

Description of Vagococcus coleopterorum sp. nov., isolated from the intestine of the diving beetle, Cybister lewisianus, and Vagococcus hydrophili sp. nov., isolated from the intestine of the dark diving beetle, Hydrophilus acuminatus, and emended description of the genus Vagococcus: Dong-Wook Hyun , Euon Jung Tak , Pil Soo Kim , Jin-Woo Bae; J. Microbiol. 2021;59(2):132-141. Published online December 23, 2020; DOI: https://doi.org/10.1007/s12275-021-0485-1

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A polyphasic taxonomic approach was used to characterize two novel bacterial strains, HDW17AT and HDW17BT, isolated from the intestine of the diving beetle Cybister lewisianus, and the dark diving beetle Hydrophilus acuminatus, respectively. Both strains were Gram-positive and facultative anaerobic cocci forming cream-colored colonies. The isolates grew optimally at 25°C, pH 7, in the presence of 0.3% (wt/vol) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences and genome sequences showed that the isolates were members of the genus Vagococcus, and strain HDW17AT was closely related to Vagococcus fessus CCUG 41755T (98.9% of 16S rRNA gene sequence similarity and 74.3% of average nucleotide identity [ANI]), whereas strain HDW17BT was closely related to Vagococcus fluvialis NCFB 2497T (98.9% of 16S rRNA gene sequence similarity and 76.6% of ANI). Both strains contained C16:0, and C18:1 ω9c as the major cellular fatty acids, but C16:1 ω9c was also observed only in strain HDW17BT as the major cellular fatty acid. The respiratory quinone of the isolates was MK-7. The major polar lipid components were phosphatidylglycerol, phosphatidylethanolamine, and diphosphatidylglycerol. The genomic DNA G + C content of strains HDW17AT and HDW17BT were 36.6 and 34.4%, respectively. Both strains had cell wall peptidoglycan composed of the amino acids L-alanine, glycine, D-glutamic acid, L-tryptophan, L-lysine, and L-aspartic acid, and the sugars ribose, glucose, and galactose. Based on phylogenetic, phenotypic, chemotaxonomic, and genotypic analyses, strains HDW17AT and HDW17BT represent two novel species in the genus Vagococcus. We propose the name Vagococcus coleopterorum sp. nov. for strain HDW17AT (= KACC 21348T = KCTC 49324T = JCM 33674T) and the name Vagococcus hydrophili sp. nov. for strain HDW17BT (= KACC 21349T = KCTC 49325T = JCM 33675T).

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Vagococcus proximus sp. nov. and Vagococcus intermedius sp. nov., originating from modified atmosphere packaged broiler meat
Per Johansson, Elina Jääskeläinen, Elina Säde, Johanna Björkroth
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
A case of Vagococcus fluvialis isolated from the bile of a patient with calculous cholecystitis
Dan Zhang, Xiaosu Wang, Jingdan Yu, Zheng Dai, Qichao Li, Litao Zhang
BMC Infectious Diseases.2023;[Epub] CrossRef
Vagococcus luciliae sp. nov., isolated from the common green bottle fly Lucilia sericata
Juan Guzman, Anja Poehlein, Rolf Daniel, Peter Kämpfer, Andreas Vilcinskas
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Valid publication of new names and new combinations effectively published outside the IJSEM. Validation List no. 203
Aharon Oren, George M. Garrity
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Effects of different doses of electron beam irradiation on bacterial community of Portunus trituberculatus
Huijuan Pan, Qi Yu, Chenru Qian, Haitao Shao, Jiajun Han, Yongyong Li, Yongjiang Lou
Food Bioscience.2021; 42: 101198. CrossRef
Description of Nocardioides piscis sp. nov., Sphingomonas piscis sp. nov. and Sphingomonas sinipercae sp. nov., isolated from the intestine of fish species Odontobutis interrupta (Korean spotted sleeper) and Siniperca scherzeri (leopard mandarin fish)
Dong-Wook Hyun, Yun-Seok Jeong, Jae-Yun Lee, Hojun Sung, So-Yeon Lee, Jee-Won Choi, Hyun Sik Kim, Pil Soo Kim, Jin-Woo Bae
Journal of Microbiology.2021; 59(6): 552. CrossRef

Vagococcus zengguangii sp. nov., isolated from yak faeces: Yajun Ge , Dong Jin , Xin-He Lai , Jing Yang , Shan Lu , Ying Huang , Han Zheng , Xiaoyan Zhang , Jianguo Xu; J. Microbiol. 2021;59(1):1-9. Published online December 23, 2020; DOI: https://doi.org/10.1007/s12275-021-0406-3

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Two unknown Gram-stain-positive, catalase- and oxidasenegative, non-motile, and coccus-shaped bacteria, designated MN-17T and MN-09, were isolated from yaks faeces (Bos grunniens) in the Qinghai-Tibet Plateau of China. 16S rRNA gene sequence-based comparative analyses revealed that the two strains were grouped within the genus Vagococcus, displaying the highest similarity with Vagococcus xieshaowenii CGMCC 1.16436T (98.6%) and Vagococcus elongatus CCUG 51432T (96.4%). Both strains grew optimally at 37°C and pH 7.0 in the presence of 0.5% (w/v) NaCl. The complete genome of MN-17T comprises 2,085 putative genes with a total of 2,190,262 bp and an average G + C content of 36.7 mol%. The major fatty acids were C16:0 (31.2%), C14:0 (28.5%), and C18:1ω9c (13.0%); the predominant respiratory quinone was MK-7 (68.8%); the peptidoglycan type was A4α(L-Lys-DAsp); and the major polar lipid was diphosphatidylglycerol. Together, these supported the affiliation of strain MN-17T to the genus Vagococcus. In silico DNA-DNA hybridization and the average nucleotide identity values between MN-17T and all recognized species in the genus were 21.6–26.1% and 70.7–83.0%, respectively. MN-17T produced acid from D-cellobiose, D-fructose, glycerol, D-glucose, N-acetyl-glucosamine, gentiobiose, D-mannose, D-maltose, D-ribose, Dsaccharose, salicin, D-trehalose, and D-xylose. These results distinguished MN-17T and MN-09 from closely related species in Vagococcus. Thus, we propose that strains MN-17T and MN-09 represent a novel species in the genus Vagococcus, with the name Vagococcus zengguangii sp. The type strain is MN-17T (= CGMCC 1.16726T = GDMCC 1.1589T = JCM 33478T).

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Vagococcus proximus sp. nov. and Vagococcus intermedius sp. nov., originating from modified atmosphere packaged broiler meat
Per Johansson, Elina Jääskeläinen, Elina Säde, Johanna Björkroth
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Phenotypic and genomic characteristics of Brevibacterium zhoupengii sp. nov., a novel halotolerant actinomycete isolated from bat feces
Yuyuan Huang, Lingzhi Dong, Jian Gong, Jing Yang, Shan Lu, Xin-He Lai, Dong Jin, Qianni Huang, Ji Pu, Liyun Liu, Jianguo Xu
Journal of Microbiology.2022; 60(10): 977. CrossRef

Review

Regulation of the AcrAB efflux system by the quorum-sensing regulator AnoR in Acinetobacter nosocomialis: Bindu Subhadra , Surya Surendran , Bo Ra Lim , Jong Sung Yim , Dong Ho Kim , Kyungho Woo , Hwa-Jung Kim , Man Hwan Oh , Chul Hee Choi; J. Microbiol. 2020;58(6):507-518. Published online May 27, 2020; DOI: https://doi.org/10.1007/s12275-020-0185-2

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Multidrug efflux pumps play an important role in antimicrobial resistance and pathogenicity in bacteria. Here, we report the functional characterization of the RND (resistance-nodulation- division) efflux pump, AcrAB, in Acinetobacter nosocomialis. An in silico analysis revealed that homologues of the AcrAB efflux pump, comprising AcrA and AcrB, are widely distributed among different bacterial species. Deletion of acrA and/or acrB genes led to decreased biofilm/pellicle formation and reduced antimicrobial resistance in A. nosocomialis. RNA sequencing and mRNA expression analyses showed that expression of acrA/B was downregulated in a quorum sensing (QS) regulator (anoR)-deletion mutant, indicating transcriptional activation of the acrAB operon by AnoR in A. nosocomialis. Bioassays showed that secretion of N-acyl homoserine lactones (AHLs) was unaffected in acrA and acrB deletion mutants; however, AHL secretion was limited in a deletion mutant of acrR, encoding the acrAB regulator, AcrR. An in silico analysis indicated the presence of AcrR-binding motifs in promoter regions of anoI (encoding AHL synthase) and anoR. Specific binding of AcrR was confirmed by electrophoretic mobility shift assays, which revealed that AcrR binds to positions -214 and -217 bp upstream of the translational start sites of anoI and anoR, respectively, demonstrating transcriptional regulation of these QS genes by AcrR. The current study further addresses the possibility that AcrAB is controlled by the osmotic stress regulator, OmpR, in A. nosocomialis. Our data demonstrate that the AcrAB efflux pump plays a crucial role in biofilm/pellicle formation and antimicrobial resistance in A. nosocomialis, and is under the transcriptional control of a number of regulators. In addition, the study emphasizes the interrelationship of QS and AcrAB efflux systems in A. nosocomialis.

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Severe fever with thrombocytopenia syndrome (SFTS) is being reported annually in South Korea since its first detection there in 2010. The causal agent is a negative-strand RNA virus 80–100 nm in diameter. It causes fever, thrombocytopenia, leukocytopenia, gastrointestinal symptoms, and neural symptoms. The mortality rate of SFTS was 32.6% among 172
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Abstract PDF

Streptococcus pneumoniae is a Gram-positive pathogen with high morbidity and mortality globally but some of its pathogenesis remains unknown. Previous research has provided evidence that aminopeptidase N (PepN) is most likely a virulence factor of S. pneumoniae. However, its role in S. pneumoniae virulence and its interaction with the host remains to be confirmed. We generated a pepN gene deficient mutant strain and found that its virulence for mice was significantly attenuated as were in vitro adhesion and invasion of host cells. The PepN protein could induce a strong innate immune response in vivo and in vitro and induced secretion of IL-6 and TNF-α by primary peritoneal macrophages via the rapid phosphorylation of MAPK and PI3K/AKT signaling pathways and this was confirmed using specific pathway inhibitors. In conclusion, PepN is a novel virulence factor that is essential for the virulence of S. pneumoniae and induces host innate immunity via MAPK and PI3K/AKT signaling.

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

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[MINIREVIEW] Interdependence between iron acquisition and biofilm formation in Pseudomonas aeruginosa: Donghoon Kang , Natalia V. Kirienko; J. Microbiol. 2018;56(7):449-457. Published online June 14, 2018; DOI: https://doi.org/10.1007/s12275-018-8114-3

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Abstract PDF

Bacterial biofilms remain a persistent threat to human healthcare due to their role in the development of antimicrobial resistance. To combat multi-drug resistant pathogens, it is crucial to enhance our understanding of not only the regulation of biofilm formation, but also its contribution to bacterial virulence. Iron acquisition lies at the crux of these two subjects. In this review, we discuss the role of iron acquisition in biofilm formation and how hosts impede this mechanism to defend against pathogens. We also discuss recent findings that suggest that biofilm formation can also have the reciprocal effect, influencing siderophore production and iron sequestration.

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REVIEW] Type 3 regulatory T cells at the interface of symbiosis: Joo-Hong Park , Gérard Eberl; J. Microbiol. 2018;56(3):163-171. Published online February 28, 2018; DOI: https://doi.org/10.1007/s12275-018-7565-x

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Abstract PDF

The mammalian gastrointestinal tract accommodates trillions of bacteria, many of which provide beneficial effects to the host, including protection from pathogenic microorganisms and essential metabolites. However, the intestinal immune system needs to adapt to the constantly fluctuating microbial environment at mucosal surfaces in order to maintain homeostasis. In particular, the gut microbiota induces the differentiation of effector Th17 cells and regulatory T cells (Tregs) that express RORγt, the master regulator of antimicrobial type 3 immunity. RORγt+ Tregs constitute a major population of colonic Tregs that is distinct from thymusderived Tregs and require bacterial antigens for differentiation. The balance between Th17 cells and RORγt+ Tregs, that is, the tone of the local type 3 immune response, is regulated by the vitamin A metabolite retinoic acid produced by the host. Furthermore, Th17 cells and RORγt+ Tregs regulate intestinal type 2 immune responses, explaining how bacteria block allergic reactions. Here, we review the cellular and molecular mechanisms involved in the differentiation, regulation and function of RORγt+ (type 3) Tregs, and discuss the multiple equilibria that exist between effector T cells and Tregs, as well as between different types of immune responses, which are necessary to maintain homeostasis and health.

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REVIEW] Innate host defenses against Cryptococcus neoformans: Camaron Hole , Floyd L. Wormley Jr.; J. Microbiol. 2016;54(3):202-211. Published online February 27, 2016; DOI: https://doi.org/10.1007/s12275-016-5625-7

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Abstract PDF

Cryptococcus neoformans, the predominant etiological agent of cryptococcosis, can cause life-threatening infections of the central nervous system in immunocompromised and immunocompetent individuals. Cryptococcal meningoencephalitis is the most common disseminated fungal infection in AIDS patients, and remains the third most common invasive fungal infection among organ transplant recipients. The administration of highly active antiretroviral therapy (HAART) has
result
ed in a decrease in the number of cases of AIDS-related cryptococcosis in developed countries, but in developing countries where HAART is not readily available, Cryptococcus is still a major concern. Therefore, there is an urgent need for the development of novel therapies and/or vaccines to combat cryptococcosis. Understanding the protective immune responses against Cryptococcus is critical for development of vaccines and immunotherapies to combat cryptococcosis. Consequently, this review focuses on our current knowledge of protective immune responses to C. neoformans, with an emphasis on innate immune responses.

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