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

Structural Insights into the Lipopolysaccharide Transport (Lpt) System as a Novel Antibiotic Target: Yurim Yoon, Saemee Song; J. Microbiol. 2024;62(4):261-275. Published online May 31, 2024; DOI: https://doi.org/10.1007/s12275-024-00137-w

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Abstract: Lipopolysaccharide (LPS) is a critical component of the extracellular leaflet within the bacterial outer membrane, forming an effective physical barrier against environmental threats in Gram-negative bacteria. After LPS is synthesized and matured in the bacterial cytoplasm and the inner membrane (IM), LPS is inserted into the outer membrane (OM) through the ATP-driven LPS transport (Lpt) pathway, which is an energy-intensive process. A trans-envelope complex that contains seven Lpt proteins (LptA-LptG) is crucial for extracting LPS from the IM and transporting it across the periplasm to the OM. The last step in LPS transport involves the mediation of the LptDE complex, facilitating the insertion of LPS into the outer leaflet of the OM. As the Lpt system plays an essential role in maintaining the impermeability of the OM via LPS decoration, the interactions between these interconnected subunits, which are meticulously regulated, may be potential targets for the development of new antibiotics to combat multidrug-resistant Gram-negative bacteria. In this review, we aimed to provide an overview of current research concerning the structural interactions within the Lpt system and their implications to clarify the function and regulation of LPS transport in the overall process of OM biogenesis. Additionally, we explored studies on the development of therapeutic inhibitors of LPS transport, the factors that limit success, and future prospects.

Journal Articles

Genetic Characteristics and Phylogeographic Dynamics of Echovirus: Yan Wang , Pir Tariq Shah , Yue Liu , Amina Nawal Bahoussi , Li Xing; J. Microbiol. 2023;61(9):865-877. Published online September 15, 2023; DOI: https://doi.org/10.1007/s12275-023-00078-w

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Abstract: Echoviruses belong to the genus Enterovirus in the Picornaviridae family, forming a large group of Enterovirus B (EVB) within the Enteroviruses. Previously, Echoviruses were classified based on the coding sequence of VP1. In this study, we performed a reliable phylogenetic classification of 277 sequences isolated from 1992 to 2019 based on the full-length genomes of Echovirus. In this report, phylogenetic, phylogeographic, recombination, and amino acid variability landscape analyses were performed to reveal the evolutional characteristics of Echovirus worldwide. Echoviruses were clustered into nine major clades, e.g., G1–G9. Phylogeographic analysis showed that branches G2–G9 were linked to common strains, while the branch G1 was only linked to G5. In contrast, strains E12, E14, and E16 clustered separately from their G3 and G7 clades respectively, and became a separate branch. In addition, we identified a total of 93 recombination events, where most of the events occurred within the VP1-VP4 coding regions. Analysis of amino acid variation showed high variability in the a positions of VP2, VP1, and VP3. This study updates the phylogenetic and phylogeographic information of Echovirus and indicates that extensive recombination and significant amino acid variation in the capsid proteins drove the emergence of new strains.

Silver Nanoparticles Modified with Polygonatum sibiricum Polysaccharide Improve Biocompatibility and Infected Wound Bacteriostasis: Ruonan Wang , Rongyu Li , Peng Zheng , Zicheng Yang , Cheng Qian , Zhou Wang , Senhe Qian; J. Microbiol. 2023;61(5):543-558. Published online April 13, 2023; DOI: https://doi.org/10.1007/s12275-023-00042-8

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Abstract

Silver nanoparticles (AgNPs) exhibit strong antibacterial activity and do not easily induce drug resistance; however, the poor stability and biocompatibility in solution limit their widespread application. In this study, AgNPs were modified with Polygonatum sibiricum Polysaccharide (PSP) to synthesize PSP@AgNPs with good stability, biocompatibility, and antibacterial activity. When PSP@AgNP synthesis was performed under a reaction time of 70 min, a reaction temperature of 35 °C, and an AgNO3- to-PSP volume ratio of 1:1, the synthesized PSP@AgNPs were more regular and uniform than AgNPs, and their particle size was around 10 nm. PSP@AgNPs exhibited lower cytotoxicity and hemolysis, and stronger bacteriostatic activity. PSP@AgNPs damage the integrity and internal structure of cells, resulting in the leakage of intracellular nucleic acids and proteins. The rate of cell membrane damage in Escherichia coli and Staphylococcus aureus treated with PSP@ AgNPs increased by 38.52% and 43.75%, respectively, compared with that of AgNPs. PSP@AgNPs inhibit the activities of key enzymes related to antioxidant, energy and substance metabolism in cells. The inhibitory effects on the activities of superoxide dismutase (SOD), catalase (CAT), adenosine triphosphate enzyme (ATPase), malate dehydrogenase (MDH), and succinate dehydrogenase (SDH) in E. coli and S. aureus cells were significantly higher than those of AgNPs. In addition, compared with AgNPs, PSP@AgNPs promote faster healing of infected wounds. Therefore, PSP@AgNPs represent potential antibacterial agents against wound infections.

Citations

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Improving the biocompatibility and antibacterial efficacy of silver nanoparticles functionalized with (LLRR)3 antimicrobial peptide
Rongyu Li, Jiaqing Mao, Peng Zheng, Ruonan Wang, Zicheng Yang, Senhe Qian
World Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef
Advancing engineered approaches for sustainable wound regeneration and repair: Harnessing the potential of green synthesized silver nanoparticles
J. Nandhini, E. Karthikeyan, E. Elizabeth Rani, V.S. Karthikha, D. Sakthi Sanjana, H. Jeevitha, S. Rajeshkumar, Vijayan Venugopal, A. Priyadharshan
Engineered Regeneration.2024; 5(3): 306. CrossRef
Effect of Polygonatum sibiricum on biological toxicity of zinc oxide nanoparticles during respiratory exposure
Jingjing Yao, Wanqing Yang, Liang Tang, Dicheng Yang, Yan Xu, Shenmin Zhu, Jun Zhu
RSC Advances.2024; 14(43): 31360. CrossRef
Enhancing Healing of Infected Wounds with Glycerin‐Modified Sodium Alginate/Silk Sericin Composite Film Functionalized with Polygonatum sibiricum Polysaccharide‐Capped Silver Nanoparticles
Zicheng Yang, Rongyu Li, Ruonan Wang, Senhe Qian
ChemistrySelect.2024;[Epub] CrossRef
Host Defense Peptides: Exploiting an Innate Immune Component Against Infectious Diseases and Cancer
Taiwo Scholes Adewole, Oladiran Boniface Oladokun, Adenike Kuku
International Journal of Peptide Research and Therapeutics.2024;[Epub] CrossRef
Research progress on medicinal components and pharmacological activities of polygonatum sibiricum
Ruilian Liu, Xili Zhang, Yuhan Cai, Shuang Xu, Qian Xu, Chengli Ling, Xin Li, Wenjiao Li, Pingan Liu, Wenlong Liu
Journal of Ethnopharmacology.2024; 328: 118024. CrossRef
A comprehensive review on the potential applications of medicine Polygonatum species in the food sector
Mi Li, Bingzong Xie, Lewen Li, Yunge Zhang, Qingmin Chen, Jian Ju, Yanli Ma
Food Bioscience.2024; 60: 104116. CrossRef
Fabrication of Highly Stable Polyurushiol-Decorated Silver Nanoparticles and Evaluation of Their Antibacterial and Anti-Microalgae Activities
Lu Zheng, Jide Zhu, Jipeng Chen, Yanlian Xu, Lilong Jiang
Journal of Inorganic and Organometallic Polymers and Materials.2024;[Epub] CrossRef
Metallic elements combine with herbal compounds upload in microneedles to promote wound healing: a review
Xiao Tang, Li Li, Gehang You, Xinyi Li, Jian Kang
Frontiers in Bioengineering and Biotechnology.2023;[Epub] CrossRef

Observational Study

Early gut microbiota in very low and extremely low birth weight preterm infants with feeding intolerance: a prospective case-control study: Ling Liu , Dang Ao , Xiangsheng Cai , Peiyi Huang , Nali Cai , Shaozhu Lin , Benqing Wu; J. Microbiol. 2022;60(10):1021-1031. Published online August 19, 2022; DOI: https://doi.org/10.1007/s12275-022-2180-2

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Abstract

The potential role of the gut microbiota in the pathogenesis of feeding intolerance (FI) remains unclear. Understanding the role of the gut microbiota could provide a new avenue for microbiota-targeted therapeutics. This study aimed to explore the associations between aberrant gut microbiota and FI in very low or extremely low birth weight (VLBW/ELBW) preterm infants. In this observational case-control study, VLBW/ ELBW infants were divided into two groups: FI group and feeding tolerance (FT) group. 16S rRNA gene sequencing was performed to analyze the gut microbial diversity and composition of the infants. The differences in the gut microbiota of the two groups were compared. In total, 165 stool samples were obtained from 44 infants, among which, 31 developed FI and 13 served as controls. Alpha diversity was the highest in the meconium samples of the two groups. LEfSe analysis revealed that the abundances of Peptostreptococcaceae, Clostridiales and Clostridia in the FT group were significantly higher than in the FI group. At the phylum level, the FI group was dominated by Proteobacteria, and the FT group was dominated by Firmicutes. The meconium samples of the FI group had higher proportions of γ-proteobacteria and Escherichia-Shigella and a lower proportion of Bacteroides compared with the FT group. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis demonstrated that aberrant gut bacteria in the FI group were strongly associated with dysregulation of C5-Brancheddibasic- acid-metabolism, protein kinases, and sporulation. These findings reveal candidate microbial markers to prevent FI. Increased relative abundances of γ-proteobacteria and Escherichia-Shigella and decreased abundance of Bacteroides in meconium were associated with an increased risk of FI, while Peptostreptococcaceae, Clostridiales and Clostridia reduced the risk of FI in VLBW/ELBW infants.

Citations

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Reduced Gut Bacterial Diversity in Early Life Predicts Feeding Intolerance in Preterm Neonates
Maria Di Chiara, Alessandro Lazzaro, Daniela Scribano, Maria Trancassini, Valeria Pietropaolo, Michele Sonnessa, Chiara De Luca, Rita Prota, Elisa Onestà, Gianluigi Laccetta, Gianluca Terrin
Tropical Medicine and Infectious Disease.2024; 9(8): 174. CrossRef
Calorie restriction during gestation impacts maternal and offspring fecal microbiome in mice
Stephanie P. Gilley, Meghan L. Ruebel, Sree V. Chintapalli, Clyde J. Wright, Paul J. Rozance, Kartik Shankar
Frontiers in Endocrinology.2024;[Epub] CrossRef
Dynamics alteration of the gut microbiota and faecal metabolomes in very low or extremely low birth weight infants: a Chinese single-center, prospective cohort study
Ling Liu, Chaohong Chen, YeShan Li, Dang Ao, Jiayuan Wu, Nali Cai, Wen Li, Min Xiang
Frontiers in Microbiology.2024;[Epub] CrossRef
Metabolic and fecal microbial changes in adult fetal growth restricted mice
Stephanie P. Gilley, Miguel A. Zarate, Lijun Zheng, Purevsuren Jambal, Deaunabah N. Yazza, Sree V. Chintapalli, Paul S. MacLean, Clyde J. Wright, Paul J. Rozance, Kartik Shankar
Pediatric Research.2024; 95(3): 647. CrossRef
A digital twin of the infant microbiome to predict neurodevelopmental deficits
Nicholas Sizemore, Kaitlyn Oliphant, Ruolin Zheng, Camilia R. Martin, Erika C. Claud, Ishanu Chattopadhyay
Science Advances.2024;[Epub] CrossRef
Investigating prenatal and perinatal factors on meconium microbiota: a systematic review and cohort study
Jenni Turunen, Mysore V. Tejesvi, Niko Paalanne, Tytti Pokka, Sajeen Bahadur Amatya, Surbhi Mishra, Anna Kaisanlahti, Justus Reunanen, Terhi Tapiainen
Pediatric Research.2024; 95(1): 135. CrossRef
Novel scoring system for early diagnosis of necrotizing enterocolitis: integrating clinical and laboratory data with urinary caveolin-1 levels
Brigitta I.R.V. Corebima, Rinawati Rohsiswatmo, Dewi Santosaningsih, Wisnu Barlianto, Kusworini Handono
Archives of Medical Science.2023; 20(2): 444. CrossRef
Dynamics and Crosstalk between Gut Microbiota, Metabolome, and Fecal Calprotectin in Very Preterm Infants: Insights into Feeding Intolerance
Luyang Hong, Yihuang Huang, Junyan Han, Shujuan Li, Lan Zhang, Siyuan Jiang, Qi Zhou, Xincheng Cao, Weiyin Yu, Yi Yang, Shangyu Hong, Yufeng Zhou, Weili Yan, Yun Cao
Nutrients.2023; 15(22): 4849. CrossRef
Characteristics of Gut Microbiota in Small for Gestational Age Infants with Very Low Birth Weight
Hung-Yang Chang, Jen-Shiu Chiang Chiau, Jui-Hsing Chang, Chyong-Hsin Hsu, Chia-Ying Lin, Mary Hsin-Ju Ko, Hung-Chang Lee
Nutrients.2022; 14(23): 5158. CrossRef
Compositional Differences of Meconium Microbiomes of Preterm and Term Infants, and Infants That Developed Necrotizing Enterocolitis or Feeding Intolerance
Hyun Mi Kang, Sol Kim, Seok Hwang-Bo, In Hyuk Yoo, Yu-Mi Seo, Moon Yeon Oh, Soo-Ah Im, Young-Ah Youn
Pathogens.2022; 12(1): 55. CrossRef

Journal Articles

Differences in the methanogen community between the nearshore and offshore sediments of the South Yellow Sea: Ye Chen , Yu Zhen , Jili Wan , Siqi Li , Jiayin Liu , Guodong Zhang , Tiezhu Mi; J. Microbiol. 2022;60(8):814-822. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2022-2

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Abstract

The differences in methanogen abundance and community composition were investigated between nearshore and offshore sediments in the South Yellow Sea (SYS). Shannon, Simpson, and Chao1 indices revealed a higher diversity of methanogens in the nearshore sediments than in the offshore sediments. The Mann–Whitney U test demonstrated that the relative abundance of Methanococcoides was significantly higher in the offshore sediments, while the relative abundances of Methanogenium, Methanosarcina, Methanosaeta, Methanolinea, and Methanomassiliicoccus were significantly higher in the nearshore sediments (P < 0.05). The abundance of the mcrA gene in the nearshore sediments was significantly higher than that in the offshore sediments. Furthermore, a similar vertical distribution of the methanogen and sulfatereducing bacteria (SRB) abundances was observed in the SYS sediments, implying there is potential cooperation between these two functional microbes in this environment. Finally, total organic carbon (TOC) was significantly correlated with methanogen community composition.

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Methylmercury cycling in the Bohai Sea and Yellow Sea: Reasons for the low system efficiency of methylmercury production
Lufeng Chen, Guoyi Cheng, Zhengwen Zhou, Yong Liang, Zhijia Ci, Yongguang Yin, Guangliang Liu, Yong Cai, Yanbin Li
Water Research.2024; 258: 121792. CrossRef
Diversity, composition, metabolic characteristics, and assembly process of the microbial community in sewer system at the early stage
Yiming Yuan, Guangyi Zhang, Hongyuan Fang, Haifeng Guo, Yongkang Li, Zezhuang Li, Siwei Peng, Fuming Wang
Environmental Science and Pollution Research.2024; 31(9): 13075. CrossRef
Improved Quantitative Real-Time PCR Protocol for Detection and Quantification of Methanogenic Archaea in Stool Samples
Agata Anna Cisek, Iwona Bąk, Bożena Cukrowska
Microorganisms.2023; 11(3): 660. CrossRef

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

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Abstract

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

Citations

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

Activity of Lactobacillus crispatus isolated from vaginal microbiota against Mycobacterium tuberculosis: Youngkyoung Lee , Hoonhee Seo , Sukyung Kim Abdur Rahim , Youjin Yoon , Jehee Jung , Saebim Lee , Chang Beom Ryu , Ho-Yeon Song; J. Microbiol. 2021;59(11):1019-1030. Published online November 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1332-0

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Abstract

Tuberculosis, an infectious disease, is caused by Mycobacterium tuberculosis. It remains a significant public health issue around the globe, causing about 1.8 million deaths every year. Drug-resistant M. tuberculosis, including multi-drug-resistant (MDR), extremely-drug-resistant (XDR), and totally drugresistant (TDR) M. tuberculosis, continues to be a threat to public health. In the case of antibiotic-resistant tuberculosis, the treatment effect of conventional antibiotics is low. Side effects caused by high doses over a long period are causing severe problems. To overcome these problems, there is an urgent need to develop a new anti-tuberculosis drug that is different from the existing compound-based antibiotics. Probiotics are defined as live microorganisms conferring health benefits. They can be potential therapeutic agents in this context as the effectiveness of probiotics against different infectious diseases has been well established. Here, we report that Lactobacillus crispatus PMC201 shows a promising effect on tuberculosis isolated from vaginal fluids of healthy Korean women. Lactobacillus crispatus PMC201 reduced M. tuberculosis H37Rv under co-culture conditions in broth and reduced M. tuberculosis H37Rv and XDR M. tuberculosis in macrophages. Lactobacillus crispatus PMC201 was not toxic to a guinea pig model and did not induce dysbiosis in a human intestinal microbial ecosystem simulator. Taken together, these
results
indicate that L. crispatus PMC201 can be a promising alternative drug candidate in the current tuberculosis drug regime. Further study is warranted to assess the in vivo efficacy and confirm the mode of action of L. crispatus PMC201.

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Exploring the potential of Lactocaseibacillus rhamnosus PMC203 in inducing autophagy to reduce the burden of Mycobacterium tuberculosis
Md Abdur Rahim, Hoonhee Seo, Sukyung Kim, Indrajeet Barman, Fatemeh Ghorbanian, Mohammed Solayman Hossain, Md Sarower Hossen Shuvo, Saebim Lee, Ho-Yeon Song
Medical Microbiology and Immunology.2024;[Epub] CrossRef
Efficacy of lyophilized Lactobacillus sakei as a potential candidate for preventing carbapenem-resistant Klebsiella infection
Hanieh Tajdozian, Hoonhee Seo, Yoonkyoung Jeong, Fatemeh Ghorbanian, Chae-eun Park, Faezeh Sarafraz, Md Abdur Rahim, Youngkyoung Lee, Sukyung Kim, Saebim Lee, Jung-Hyun Ju, Chul-Ho Kim, Ho-Yeon Song
Annals of Microbiology.2024;[Epub] CrossRef
Identification of Probiotic Strains with Anti-Tuberculosis Activity and Their Characterization as Potential Therapeutic Agents
Mohammed Solayman Hossain, Hoonhee Seo, Md Abdur Rahim, Md Sarower Hossen Shuvo, Indrajeet Barman, Hokyoung Kim, Jinhyeon An, Sukyung Kim, Ho-Yeon Song
Journal of Bacteriology and Virology.2024; 54(4): 325. CrossRef
The gut and lung microbiota in pulmonary tuberculosis: susceptibility, function, and new insights into treatment
Qiqi Zhuo, Xianyi Zhang, Kehong Zhang, Chan Chen, Zhen Huang, Yuzhong Xu
Expert Review of Anti-infective Therapy.2023; 21(12): 1355. CrossRef
Host microbiome in tuberculosis: disease, treatment, and immunity perspectives
Archana Pant, Bhabatosh Das, Gopalakrishnan Aneeshkumar Arimbasseri
Frontiers in Microbiology.2023;[Epub] CrossRef
Antibiotic Resistance to Mycobacterium tuberculosis and Potential Use of Natural and Biological Products as Alternative Anti-Mycobacterial Agents
Roberto Arrigoni, Andrea Ballini, Skender Topi, Lucrezia Bottalico, Emilio Jirillo, Luigi Santacroce
Antibiotics.2022; 11(10): 1431. CrossRef
In Vivo Efficacy of Bacillus velezensis Isolated from Korean Gochang Bokbunja Vinegar against Carbapenem-Resistant Klebsiella pneumoniae Infections
Fatemeh Ghorbanian, Hoonhee Seo, Hanieh Tajdozian, Youngkyoung Lee, MD Abdur Rahim, Sukyung Kim, Il-Yun Jung, Saebim Lee, Ho-Yeon Song
Polish Journal of Microbiology.2022; 71(4): 553. CrossRef

The putative sensor histidine kinase VadJ coordinates development and sterigmatocystin production in Aspergillus nidulans: Yanxia Zhao , Mi-Kyung Lee , Jieyin Lim , Heungyun Moon , Hee-Soo Park , Weifa Zheng , Jae-Hyuk Yu; J. Microbiol. 2021;59(8):746-752. Published online July 5, 2021; DOI: https://doi.org/10.1007/s12275-021-1055-2

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Abstract

The VosA-VelB heterocomplex governs expression of several genes associated with fungal development and secondary metabolism. In this study, we have investigated the functions of one of the VosA-VelB-activated developmental genes vadJ in development and production of the mycotoxin sterigmatocystin in the model fungus Aspergillus nidulans. The vadJ gene is predicted to encode a 957-amino acid length protein containing a highly conserved sensor histidine kinase domain. The deletion of vosA or velB resulted in decreased mRNA levels of vadJ throughout the life cycle, suggesting that VosA and VelB are necessary for proper expression of vadJ. Nullifying vadJ led to highly restricted colony growth, lowered formation of asexual spores, and about two-fold reduction in conidial viability. Conversely, the deletion of vadJ resulted in elevated production of sexual fruiting bodies and sterigmatocystin. These suggest that VadJ is necessary for proper coordination of asexual and sexual development, and sterigmatocystin production. In accordance with this idea, the deletion of vadJ led to elevated mRNA levels of the two key sexual developmental activators esdC and nsdD. In summary, the putative sensor histidine kinase VadJ represses sexual development and sterigmatocystin production, but activates asexual development in A. nidulans.

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Velvet Family Protein FpVelB Affects Virulence in Association with Secondary Metabolism in Fusarium pseudograminearum
Yuxing Wu, Sen Han, Yajiao Wang, Qiusheng Li, Lingxiao Kong
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Involvement of LaeA and Velvet Proteins in Regulating the Production of Mycotoxins and Other Fungal Secondary Metabolites
Xuwen Hou, Liyao Liu, Dan Xu, Daowan Lai, Ligang Zhou
Journal of Fungi.2024; 10(8): 561. CrossRef
Adaptative responses of Neurospora crassa by histidine kinases upon the attack of the arthropod Sinella curviseta
Ting Lu, Xiao-meng Wang, Peng-xu Chen, Juan Xi, Han-bing Yang, Wei-fa Zheng, Yan-xia Zhao
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Nadia Tahtah, Chrystian Zetina-Serrano, Ophélie Rocher, Claire Naylies, Yannick Lippi, André El Khoury, Ali Atoui, Emilien L. Jamin, Isabelle P. Oswald, Sophie Lorber, Olivier Puel
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Ye-Eun Son, Jae-Hyuk Yu, Hee-Soo Park
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Kunlong Yang, Jun Tian, Nancy P. Keller
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The Putative C2H2 Transcription Factor VadH Governs Development, Osmotic Stress Response, and Sterigmatocystin Production in Aspergillus nidulans
Xiaoyu Li, Yanxia Zhao, Heungyun Moon, Jieyin Lim, Hee-Soo Park, Zhiqiang Liu, Jae-Hyuk Yu
Cells.2022; 11(24): 3998. CrossRef

Influence of dragon bamboo with different planting patterns on microbial community and physicochemical property of soil on sunny and shady slopes: Weiyi Liu , Fang Wang , Yanmei Sun , Lei Yang , Huihai Chen , Weijie Liu , Bin Zhu , Chaomao Hui , Shiwei Wang; J. Microbiol. 2020;58(11):906-914. Published online October 30, 2020; DOI: https://doi.org/10.1007/s12275-020-0082-8

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Abstract

Dragon bamboo (Dendrocalamus giganteus) is a giant sympodial bamboo species widely distributed in Asia. However, it remains unclear how dragon bamboo and soil microbes interact to affect soil properties. In this study, we investigated the planting patterns (semi-natural and artificial) on different slopes (sunny and shady) to determine the effects on soil properties and microbial community. The results showed that the soil in which dragon bamboo was grown was acidic, with a pH value of ~5. Also, the soil organic matter content, nitrogen hydrolysate concentration, total nitrogen, available potassium, and total potassium of the dragon bamboo seminatural forest significantly improved, especially on the sunny slope. In contrast, the available phosphorus level was higher in the artificial bamboo forest, probably owing to the phosphate fertilizer application. The bacterial and fungal diversity and the bacterial abundance were all higher on the sunny slope of the semi-natural forest than those in the other samples. The microbial operational taxonomic units (OTUs) shared between the shady and sunny slopes accounted for 47.8–62.2%, but the core OTUs of all samples were only 24.4– 30.4% of each sample, suggesting that the slope type had a significant effect on the microbial community. Some acidophilic microbes, such as Acidobacteria groups, Streptomyces and Mortierella, became dominant in dragon bamboo forest soil. A PICRUSt analysis of the bacterial functional groups revealed that post-translational modification, cell division, and coenzyme transport and metabolism were abundant in the semi-natural forest. However, some microorganisms with strong stress resistance might be activated in the artificial forest. Taken together, these results illustrated the influence of dragon bamboo growth on soil physicochemical property and microbial community, which might help understand the growth status of dragon bamboo under different planting patterns.

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Qian Chen, Manyun Zhang, Negar Omidvar, Zhihong Xu, Shahla Hosseini Bai, Chaomao Hui, Weiyi Liu
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Weixue Luo, Qingyu Zhang, Peng Wang, Jie Luo, Chunyan She, Xuman Guo, Jiajia Yuan, Yuhong Sun, Ruming Guo, Zongfeng Li, Jinchun Liu, Jianping Tao
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Jiayi Hu, Xiaofang Yang, Huajian Chi, Xin Liu, Ning Lu, Ya Liu, Shengchun Yang, Xiaodong Wen
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Wenxin Chen, Qianqian Gao, Huaying Hu, Tingwei Shao, Chuifan Zhou
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Ping Zhu, Wenyan Liu, Zhongyuan Sun, Xinfu Bai, Jianqiang Song, Nan Wu, Yuping Hou
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The relationship between bacterial diversity and organic carbon mineralization in soft rock and sand compound soil: Zhen Guo , Juan Li , Lei Ge , Chenxi Yang , Jichang Han; J. Microbiol. 2020;58(9):750-760. Published online July 24, 2020; DOI: https://doi.org/10.1007/s12275-020-0130-4

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Abstract

The soil organic carbon (SOC) mineralization rate in sandy soil plays an important role in improving soil quality, and a research is needed to determine management practices that optimize the mineralization rate. When sandy soil is improved by adding soft rock, the specific promotion process of bacterium to SOC mineralization remain unclear. To investigate these mechanisms, we selected four treatments with soft rock to sand volume ratios of 0:1 (CK), 1:5 (C1), 1:2 (C2) and 1:1 (C3) to study. The mineralization rate of organic carbon was measured using the lye absorption method. Highthroughput sequencing and scanning electron microscopy were used to determine the bacterial community structure and soil microstructure, respectively. The results showed that the organic carbon content of the sandy soil increased significantly (182.22–276.43%) after using the soft rock treatments. The SOC mineralization rate could be divided into two stages: a rapid decline during days 1–8 and a slow decline during days 8–60. With increased incubation time, the intensity of the cumulative release of organic carbon gradually weakened. Compared with the CK treatment, the SOC mineralization accumulation (Ct) and the potential mineralizable organic carbon content (C0) in the C1, C2, and C3 treatments increased significantly, by 106.98–225.94% and 112.22– 254.08%, respectively. The cumulative mineralization rate (Cr) was 18.11% and 21.38% smaller with treatments C2 and C3, respectively. The SOC mineralization rate constant (k) decreased significantly after the addition of soft rock, while the half-turnover period (Th) changed inversely with k. Compared with the CK treatment, the number of gene copies of the soil bacteria increased by 15.38–272.53% after adding soft rock, with the most significant increase in treatment C3. The bacterial diversity index also increased significantly under treatment C3. The three dominant bacteria were Proteobacteria, Actinobacteria, and Chloroflexi. The correlation between Cr and one of the non-dominant bacteria, Firmicutes, was large, and the bacteria had a significant positive correlation with k. At the same time, the abundance of Firmicutes under treatments C2 and C3 was small. As the proportion of soft rock increased, the soil particles changed from point contact to surface contact, and the adhesion on the surface of the particles gradually increased. Results from this study show that the retention time of SOC can be increased and the carbon sequestration effect is better when the ratio of soft rock to sand is set to 1:2.

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Response of soil structure and crop yield to soft rock in Mu Us sandy land, China
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Novosphingobium sp. PP1Y as a novel source of outer membrane vesicles: Federica De Lise , Francesca Mensitieri , Giulia Rusciano , Fabrizio Dal Piaz , Giovanni Forte , Flaviana Di Lorenzo , Antonio Molinaro , Armando Zarrelli , Valeria Romanucci , Valeria Cafaro , Antonio Sasso , Amelia Filippelli , Alberto Di Donato , Viviana Izzo; J. Microbiol. 2019;57(6):498-508. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8483-2

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Abstract

Outer membrane vesicles (OMVs) are nanostructures of 20– 200 nm diameter deriving from the surface of several Gramnegative bacteria. OMVs are emerging as shuttles involved in several mechanisms of communication and environmental adaptation. In this work, OMVs were isolated and characterized from Novosphingobium sp. PP1Y, a Gram-negative non-pathogenic microorganism lacking LPS on the outer membrane surface and whose genome was sequenced and annotated. Scanning electron microscopy performed on samples obtained from a culture in minimal medium highlighted the presence of PP1Y cells embedded in an extracellular matrix rich in vesicular structures. OMVs were collected from the exhausted growth medium during the mid-exponential phase, and purified by ultracentrifugation on a sucrose gradient. Atomic force microscopy, dynamic light scattering and nanoparticle tracking analysis showed that purified PP1Y OMVs had a spherical morphology with a diameter of ca. 150 nm and were homogenous in size and shape. Moreover, proteomic and fatty acid analysis of purified OMVs revealed a specific biochemical “fingerprint”, suggesting interesting details concerning their biogenesis and physiological role. Moreover, these extracellular nanostructures do not appear to be cytotoxic on HaCaT cell line, thus paving the way to their future use as novel drug delivery systems.

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Antimicrobial effect and proposed action mechanism of cordycepin against Escherichia coli and Bacillus subtilis: Qi Jiang , Zaixiang Lou , Hongxin Wang , Chen Chen; J. Microbiol. 2019;57(4):288-297. Published online March 30, 2019; DOI: https://doi.org/10.1007/s12275-019-8113-z

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Abstract

The detailed antibacterial mechanism of cordycepin efficacy against food-borne germs remains ambiguous. In this study, the antibacterial activity and action mechanism of cordycepin were assessed. The results showed that cordycepin effectively inhibited the growth of seven bacterial pathogens including both Gram-positive and Gram-negative bacterial pathogens; the minimum inhibitory concentrations (MIC) were 2.5 and 1.25 mg/ml against Escherichia coli and Bacillus subtilis, respectively. Scanning electron microscope and transmission electron microscope examination confirmed that cordycepin caused obvious damages in the cytoplasmatic membranes of both E. coli and B. subtilis. Outer membrane permeability assessment indicated the loss of barrier function and the leakage of cytoplasmic contents. Propidium iodide and carboxyfluorescein diacetate double staining approach coupled with flow cytometry analysis indicated that the integrity of cell membrane was severely damaged during a short time, while the intracellular enzyme system still remained active. This clearly suggested that membrane damage was one of the reasons for cordycepin efficacy against bacteria. Additionally, results from circular dichroism and fluorescence analysis indicated cordycepin could insert to genome DNA base and double strand, which disordered the structure of genomic DNA. Basis on these results, the mode of bactericidal action of cordycepin against E. coli and B. subtilis was found to be a dual mechanism, disrupting bacterial cell membranes and binding to bacterial genomic DNA to interfere in cellular functions, ultimately leading to cell death.

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Review

[Minireview] Antibiotic resistance of pathogenic Acinetobacter species and emerging combination therapy: Bora Shin , Woojun Park; J. Microbiol. 2017;55(11):837-849. Published online October 27, 2017; DOI: https://doi.org/10.1007/s12275-017-7288-4

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Abstract

The increasing antibiotic resistance of Acinetobacter species in both natural and hospital environments has become a serious problem worldwide in recent decades. Because of both intrinsic and acquired antimicrobial resistance (AMR) against last-resort antibiotics such as carbapenems, novel therapeutics are urgently required to treat Acinetobacter-associated infectious diseases. Among the many pathogenic Acinetobacter species, A. baumannii has been reported to be resistant to all classes of antibiotics and contains many AMR genes, such as blaADC (Acinetobacter-derived cephalosporinase). The AMR of pathogenic Acinetobacter species is the result of several different mechanisms, including active efflux pumps, mutations in antibiotic targets, antibiotic modification, and low antibiotic membrane permeability. To overcome the limitations of existing drugs, combination theraphy that can increase the activity of antibiotics should be considered in the treatment of Acinetobacter infections. Understanding the molecular mechanisms behind Acinetobacter AMR resistance will provide vital information for drug development and therapeutic strategies using combination treatment. Here, we summarize the classic mechanisms of Acinetobacter AMR, along with newly-discovered genetic AMR factors and currently available antimicrobial adjuvants that can enhance drug efficacy in the treatment of A. baumannii infections.

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Journal Article

Proteomic characterization of the outer membrane vesicle of the halophilic marine bacterium Novosphingobium pentaromativorans US6-1: Sung Ho Yun , Sang-Yeop Lee , Chi-Won Choi , Hayoung Lee , Hyun-Joo Ro , Sangmi Jun , Yong Min Kwon , Kae Kyoung Kwon , Sang-Jin Kim , Gun-Hwa Kim , Seung Il Kim; J. Microbiol. 2017;55(1):56-62. Published online December 30, 2016; DOI: https://doi.org/10.1007/s12275-017-6581-6

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Abstract

Novosphingobium pentaromativorans US6-1 is a Gram-negative halophilic marine bacterium able to utilize several polycyclic aromatic hydrocarbons such as phenanthrene, pyrene, and benzo[a]pyrene. In this study, using transmission electron microscopy, we confirmed that N. pentaromativorans US6-1 produces outer membrane vesicles (OMVs). N. pentaromativorans OMVs (hereafter OMVNovo) are spherical in shape, and the average diameter of OMVNovo is 25–70 nm. Proteomic analysis revealed that outer membrane proteins and periplasmic proteins of N. pentaromativorans are the major protein components of OMVNovo. Comparative proteomic analysis with the membrane-associated protein fraction and correlation analysis demonstrated that the outer membrane proteins of OMVNovo originated from the membrane- associated protein fraction. To the best of our knowledge, this study is the first to characterize OMV purified from halophilic marine bacteria.

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