Journal of Microbiology

Review

Structural analysis of dual specificity phosphatases, the only type of protein tyrosine phosphatases found in humans and across diverse microorganisms: Bonsu Ku; J. Microbiol. 2025;63(10):e2506006. Published online October 31, 2025; DOI: https://doi.org/10.71150/jm.2506006

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Abstract PDF Supplementary Material: Dual specificity phosphatases (DUSPs), a subfamily of the protein tyrosine phosphatase (PTP) family, dephosphorylate not only phosphotyrosine but also phosphoserine and phosphothreonine residues. Beyond the 26 members of this family in humans, DUSPs represent the only type of PTPs found across a wide range of microorganisms, including bacteria, archaea, and viruses. This review presents a comprehensive structural analysis of human and microbial DUSPs. These proteins commonly share core features, such as a typical DUSP fold, shallow active site pocket, signature active site motif known as the P-loop, and conserved aspartate residue that acts as a general acid/base. However, DUSPs from diverse microorganisms also display unique structural and functional characteristics. Pseudomonas aeruginosa TpbA is the only bacterial DUSP identified to date, while a second candidate was proposed in this review. Archaeal DUSPs are hyperthermostable, contain a unique motif in their P-loops, and employ dual general acid/base residues. Poxviral DUSPs are characterized by the formation of domain-swapped homodimers. The presence of DUSPs across all domains of life and viruses, along with their low specificity for phosphorylated amino acids and structural similarity to classical PTPs, suggests that DUSPs represent the ancestral form of PTPs.

Full article

Crystal structures of the μ2 subunit of clathrin-adaptor protein 2 in complex with peptides derived from human papillomavirus 16 E7: Sujin Jung, Dahwan Lim, Joon Sig Choi, Ho-Chul Shin, Seung Jun Kim, Bonsu Ku; J. Microbiol. 2025;63(8):e2505003. Published online August 31, 2025; DOI: https://doi.org/10.71150/jm.2505003

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Abstract PDF: Human papillomaviruses (HPVs) cause abnormal cellular proliferation, leading to malignant or benign lesions, such as cervical cancer and warts. The genome of HPV16, the most prevalent high-risk oncogenic genotype within the Alphapapillomavirus genus, encodes two oncoproteins. One of these proteins, E7, interacts with multiple host proteins and modulates their functions through distinct pathways. The CR2 domain of HPV16 E7 was recently reported to interact with the μ2 subunit of clathrin-adaptor protein 2 (AP2-μ2), an adaptor complex involved in cargo internalization during clathrin-mediated endocytosis. In this study, to provide molecular insights into their intermolecular interactions, we determined the crystal structures of AP2-μ2 in complex with the HPV16 E7-derived peptides. Subsequent biochemical analyses revealed that this interaction is primarily maintained by the Y-x-x-Φ motif and further supported by acidic cluster residues of HPV16 E7. Finally, sequence alignment of the E7 CR2 domains from various HPV genotypes showed that the AP2-μ2-binding motif is largely conserved in Alpha-, Beta-, and Mupapillomaviruses, but not in Nu- and Gammapapillomaviruses.

Journal Articles

Environmental Adaptability and Roles in Ammonia Oxidation of Aerobic Ammonia-Oxidizing Microorganisms in the Surface Sediments of East China Sea: Wenhui Li, Yu Zhen, Yuhong Yang, Daling Wang, Hui He; J. Microbiol. 2024;62(10):845-858. Published online August 30, 2024; DOI: https://doi.org/10.1007/s12275-024-00166-5

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This study investigated the community characteristics and environmental influencing factors of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in the surface sediments of the East China Sea. The research found no consistent pattern in the richness and diversity of AOA and AOB with respect to the distance from the shore, indicating a complex interplay of factors. The expression levels of AOA amoA gene and AOB amoA gene in the surface sediments of the East China Sea ranged from 4.49 × 10² to 2.17 × 10⁶ copies per gram of sediment and from 6.6 × 10¹ to 7.65 × 10⁴ copies per gram of sediment, respectively. Salinity (31.77 to 34.53 PSU) and nitrate concentration (1.51 to 10.12 μmol/L) were identified as key environmental factors significantly affecting the AOA community, while salinity and temperature (13.71 to 19.50 °C) were crucial for the AOB community. The study also found that AOA, dominated by the Nitrosopumilaceae family, exhibited higher gene expression levels than AOB, suggesting a more significant role in ammonia oxidation. The expression of AOB was sensitive to multiple environmental factors, indicating a responsive role in nitrogen cycles and ecosystem health. The findings contribute to a better understanding of the biogeochemical processes and ecological roles of ammonia-oxidizing microorganisms in marine sediments.

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Metabolism diversification of ammonia-oxidizing archaea and bacteria under different precipitation gradients and land legacies
Soumyadev Sarkar, Anna Kazarina, Paige M. Hansen, Kaitlyn Ward, Christopher Hargreaves, Nicholas Reese, Qinghong Ran, Willow Kessler, Ligia F.T. de Souza, Terry D. Loecke, Marcos V.M. Sarto, Charles W. Rice, Lydia H. Zeglin, Benjamin A. Sikes, Sonny T.M.
Applied Soil Ecology.2025; 206: 105831. CrossRef
Genetic and transcriptional profiles of ammonia oxidizing communities in Bohai sediments: abundance, activity, and environmental correlations
Yining Jiang, Xue Lou, Mingyang Wang, Minggang Zheng, Zhiyao Wang, Hui Chen
Frontiers in Microbiology.2025;[Epub] CrossRef

Flavivirga spongiicola sp. nov. and Flavivirga abyssicola sp. nov., Isolated from Marine Environments: Sung-Hyun Yang , Mi-Jeong Park , Hyun-Myung Oh , Yeong-Jun Park , Kae Kyoung Kwon; J. Microbiol. 2024;62(1):11-19. Published online February 6, 2024; DOI: https://doi.org/10.1007/s12275-023-00102-z

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Two novel Gram-stain-negative, strictly-aerobic, rod-shaped (1.2 ± 3.4 μm × 0.3 ± 0.7 μm), and non-motile marine bacterial species, designated MEBiC05379T and MEBiC07777T, were isolated from a marine sponge Pseudaxinella sp. in Gangneung City and deep-sea sediments of the Ulleung basin in the East Sea of Korea, respectively. The 16S rRNA gene sequence analysis revealed high levels of similarities between these strains and members of the genus Flavivirga (97.0–98.4% sequence identities). Both novel strains revealed as mesophilic, neutrophilic in pH and slightly halophilic. Similar to those of other Flavivirga members, the primary cellular fatty acids of both strains were iso-C15:0, iso-C15:1 G, iso-C15:03-OH, and iso-C17:0 3-OH, with MEBiC05379T and MEBiC07777T containing relatively higher proportions of C12: 0 and summed feature 3 ( C16:1ω7c and/or C16: 1ω6c). In both taxa, the major isoprenoid quinone was MK-6. The DNA G + C contents of MEBiC05379T and MEBiC07777T genomes were 32.62 and 32.46 mol%, respectively. Compared to other members of Flavivirga, both strains exhibited similar DNA G + C ratio and fatty acids pattern, yet enzyme expression and carbon sources utilization pattern were different. Genomes of the genus Flavivirga showed enzyme preferences to fucoidan and sulfated galactans. Considering the monophyly rule, AAI values delineate the genus Flavivirga from adjacent genera calculated to be 76.0–78.7%. Based on the phenotypic, genomic and biochemical data, strains for MEBiC05379T and MEBiC07777T thus represent two novel species in the genus Flavivirga, for which the names Flavivirga spongiicola sp. nov. ( MEBiC05379T [= KCTC 92527 T = JCM 16662 T]), and Flavivirga abyssicola sp. nov. ( MEBiC07777T [= KCTC 92563 T = JCM 36477 T]) are proposed.

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Phycobium rhodophyticola gen. nov., sp. nov. and Aliiphycobium algicola gen. nov., sp. nov., isolated from the phycosphere of marine red algae
Jeong Min Kim, Woonhee Baek, Byeong Jun Choi, Hülya Bayburt, Jae Kyeong Lee, Sung Chul Lee, Che Ok Jeon
Journal of Microbiology.2025; 63(6): e2503014. CrossRef
Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., isolated from Korean coastal surface seawater
Jisoo Han, Yeonjung Lim, Mirae Kim, Jang-Cheon Cho
Journal of Microbiology.2025; 63(8): e2504017. CrossRef
Rhodobacteraceae are Prevalent and Ecologically Crucial Bacterial Members in Marine Biofloc Aquaculture
Meora Rajeev, Jang-Cheon Cho
Journal of Microbiology.2024; 62(11): 985. CrossRef
Validation List no. 220. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef
Optimization of Culture Medium for the Production of an Exopolysaccharide (p-CY02) with Cryoprotective Activity by Pseudoalteromonas sp. RosPo-2 from the Antarctic Sea
Pilsung Kang, Sung Jin Kim, Ha Ju Park, Il Chan Kim, Se Jong Han, Joung Han Yim
Journal of Microbiology and Biotechnology.2024; 34(5): 1135. CrossRef

Review

Manganese Transporter Proteins in Salmonella enterica serovar Typhimurium: Nakyeong Ha , Eun-Jin Lee; J. Microbiol. 2023;61(3):289-296. Published online March 2, 2023; DOI: https://doi.org/10.1007/s12275-023-00027-7

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The metal cofactors are essential for the function of many enzymes. The host restricts the metal acquisition of pathogens for their immunity and the pathogens have evolved many ways to obtain metal ions for their survival and growth. Salmonella enterica serovar Typhimurium also needs several metal cofactors for its survival, and manganese has been found to contribute to Salmonella pathogenesis. Manganese helps Salmonella withstand oxidative and nitrosative stresses. In addition, manganese affects glycolysis and the reductive TCA, which leads to the inhibition of energetic and biosynthetic metabolism. Therefore, manganese homeostasis is crucial for full virulence of Salmonella. Here, we summarize the current information about three importers and two exporters of manganese that have been identified in Salmonella. MntH, SitABCD, and ZupT have been shown to participate in manganese uptake. mntH and sitABCD are upregulated by low manganese concentration, oxidative stress, and host NRAMP1 level. mntH also contains a Mn2+- dependent riboswitch in its 5′ UTR. Regulation of zupT expression requires further investigation. MntP and YiiP have been identified as manganese efflux proteins. mntP is transcr!ptionally activated by MntR at high manganese levels and repressed its activity by MntS at low manganese levels. Regulation of yiiP requires further analysis, but it has been shown that yiiP expression is not dependent on MntS. Besides these five transporters, there might be additional transporters that need to be identified.

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Microbial communities and substrate properties influence the fate of a human pathogen in horticultural substrates with different peat content
Antje Müller, Jasmin Schmidt, Verena Maiberg, Oscar Gehring, Adam Schikora
Frontiers in Horticulture.2025;[Epub] CrossRef
Dietary Manganese Modulates Microbiota and Intestinal N‐Acylethanolamines in a Sex‐Specific Manner in Mice With Diet‐Induced Obesity
Fredy Alexander Guevara Agudelo, Nadine Leblanc, Isabelle Bourdeau‐Julien, Gabrielle St‐Arnaud, Fadil Dahhani, Nicolas Flamand, Alain Veilleux, Vincenzo Di Marzo, Frédéric Raymond
The FASEB Journal.2025;[Epub] CrossRef
Functional characterization of a TerC family protein of Riemerella anatipestifer in manganese detoxification and virulence
Qinyuan Chen, Fang Guo, Li Huang, Mengying Wang, Chunfeng Shi, Shutong Zhang, Yizhou Yao, Mingshu Wang, Dekang Zhu, Renyong Jia, Shun Chen, Xinxin Zhao, Qiao Yang, Ying Wu, Shaqiu Zhang, Bin Tian, Juan Huang, Xumin Ou, Qun Gao, Di Sun, Ling Zhang, Yanling
Applied and Environmental Microbiology.2024;[Epub] CrossRef
NO enhances the adaptability to high-salt environments by regulating osmotic balance, antioxidant defense, and ion homeostasis in eelgrass based on transcriptome and metabolome analysis
Xianyan Wang, Tongtong Wang, Pei Yu, Yuchun Li, Xinfang Lv
Frontiers in Plant Science.2024;[Epub] CrossRef
High-throughput fitness experiments reveal specific vulnerabilities of human-adapted Salmonella during stress and infection
Benjamin X. Wang, Dmitry Leshchiner, Lijuan Luo, Miles Tuncel, Karsten Hokamp, Jay C. D. Hinton, Denise M. Monack
Nature Genetics.2024; 56(6): 1288. CrossRef
Biological characteristics of manganese transporter MntP in Klebsiella pneumoniae
Wei Peng, Yafei Xu, Yilin Yin, Jichen Xie, Renhui Ma, Guoyuan Song, Zhiqiang Zhang, Qiuhang Quan, Qinggen Jiang, Moran Li, Bei Li, Michael David Leslie Johnson
mSphere.2024;[Epub] CrossRef
Exploring resource competition by protective lactic acid bacteria cultures to control Salmonella in food: an Achilles’ heel to target?
Ludovico Screpanti, Nathalie Desmasures, Margot Schlusselhuber
Critical Reviews in Food Science and Nutrition.2024; : 1. CrossRef
Substrate-Induced Structural Dynamics and Evolutionary Linkage of Siderophore-Iron ABC Transporters of Mycobacterium tuberculosis
Aisha Farhana, Abdullah Alsrhani, Hasan Ejaz, Muharib Alruwaili, Ayman A. M. Alameen, Emad Manni, Zafar Rasheed, Yusuf Saleem Khan
Medicina.2024; 60(11): 1891. CrossRef
Structures and coordination chemistry of transporters involved in manganese and iron homeostasis
Shamayeeta Ray, Rachelle Gaudet
Biochemical Society Transactions.2023; 51(3): 897. CrossRef
Bacterial Regulatory Mechanisms for the Control of Cellular Processes: Simple Organisms’ Complex Regulation
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Journal of Microbiology.2023; 61(3): 273. CrossRef

Journal Articles

Expression and purification of intracrine human FGF 11 and study of its FGFR-dependent biological activity: Kyeong Won Lee , Young Jun An , Janet Lee , Ye-Eun Jung , In Young Ko , Jonghwa Jin , Ji Hoon Park , Won Kyu Lee , Kiweon Cha , Sun-Shin Cha , Jung-Hyun Lee , Hyung-Soon Yim; J. Microbiol. 2022;60(11):1086-1094. Published online November 1, 2022; DOI: https://doi.org/10.1007/s12275-022-2406-3

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Fibroblast growth factor 11 (FGF11) is one of intracrine FGFs (iFGFs), which function within cells. Unlike canonical FGFs, FGF11 remains intracellularly and plays biological roles in FGF receptor (FGFR)-independent manner. Here, we established an expression system of recombinant FGF11 proteins in E. coli and investigated whether the extracellular administration of FGF11 can activate cellular signaling. Human FGF11 has two isoforms, FGF11a and FGF11b, depending on the presence of nuclear localization sequences (NLSs) in the N-terminus. Because these two isoforms are unstable, we prepared an FGF11a-Mut by substituting three cysteine residues in the NLS with serine and FGF11b-ΔC with C-terminal truncation. The introduction of mutation in the NLS improved the solubility of FGF11 prepared from E. coli. Exogenous addition of FGF11b and FGF11b-ΔC to BALB3T3 increased cell proliferation, while FGF11a-Mut exerted no effect. FGF11b-ΔC showed higher cell proliferation activity and FGFR signaling than FGF11b. The cell-proliferating activities of FGF11b and FGF11b-ΔC were blocked by an FGFR1 inhibitor or a recombinant FGFR1, confirming the FGFR1- dependent extracellular activity of FGF11b. The analysis of circular dichroism suggested that the C-terminus of FGF11 has an α-helical structure, which may affect its interaction with FGFR1. These results suggest that the N-and C-terminus of recombinant FGF11 are involved in the activation of FGFR1. The above results provide novel insights into the function and mechanism of FGF11 that may aid the development of useful ligands for FGFR regulation.

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Fibroblast Growth Factors: Roles and Emerging Therapeutic Applications
Gaëtane Ternier, Kaynat Shahzad, Oshadi Edirisinghe, Patience Okoto, Zeina Alraawi, Shivakumar Sonnaila, Phuc Phan, Paul D. Adams, Suresh K. Thallapuranam
Current Drug Targets.2025; 26(8): 551. CrossRef
Production and purification of recombinant long protein isoforms of FGF11 subfamily
Martyna Biadun, Szymon Sidor, Marta Kalka, Radoslaw Karelus, Martyna Sochacka, Daniel Krowarsch, Lukasz Opalinski, Malgorzata Zakrzewska
Journal of Biotechnology.2025; 403: 9. CrossRef
Function of orthologous fibroblast growth factor 11 protein in angiogenesis and immunomodulatory after spinal cord injury
Congcong Zou, Min Chen, Qian Zhao, Letong Wang, Luyang Ye, Xiaolei Meng, Xiaokun Li, Yanming Zuo, Zhouguang Wang
International Journal of Biological Macromolecules.2025; 330: 148106. CrossRef
Glycosylation of FGF/FGFR: An underrated sweet code regulating cellular signaling programs
Aleksandra Gędaj, Paulina Gregorczyk, Dominika Żukowska, Aleksandra Chorążewska, Krzysztof Ciura, Marta Kalka, Natalia Porębska, Łukasz Opaliński
Cytokine & Growth Factor Reviews.2024; 77: 39. CrossRef
FGF homologous factors are secreted from cells to induce FGFR‐mediated anti‐apoptotic response
Martyna Biadun, Martyna Sochacka, Radoslaw Karelus, Karolina Baran, Aleksandra Czyrek, Jacek Otlewski, Daniel Krowarsch, Lukasz Opalinski, Malgorzata Zakrzewska
The FASEB Journal.2023;[Epub] CrossRef
FGF/FGFR1 system in paired breast tumor-adjacent and tumor tissues, associations with mammographic breast density and tumor characteristics
Öykü Boraka, Marie Klintman, Johan Vallon-Christersson, Sophia Zackrisson, Per Hall, Signe Borgquist, Ann H. Rosendahl
Frontiers in Oncology.2023;[Epub] CrossRef

Genomic and physiological analysis of C50 carotenoid-producing novel Halorubrum ruber sp. nov.: Chi Young Hwang , Eui-Sang Cho , Won Jong Rhee , Eunjung Kim , Myung-Ji Seo; J. Microbiol. 2022;60(10):1007-1020. Published online August 26, 2022; DOI: https://doi.org/10.1007/s12275-022-2173-1

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A novel haloarchaeal species designated as MBLA0099T was isolated from seawater near Yeongheung Island. Cells were Gram-negative, non-motile, red-pigmented, and rod-shaped. They grew at 10–45°C, within pH 5.5–9.0, and between 7.5% and 30% NaCl concentrations. Cells were able to grow without Mg2+ and were lysed in distilled water. The size of the whole-genome and G + C content of DNA was 3.02 Mb and 68.9 mol%, respectively. Phylogenetic analysis shows that the strain MBLA0099T belongs to the genus Halorubrum. The average nucleotide and amino acid identity, and in silico DNA-DNA hybridization values were below the species delineation threshold. Pan-genomic analysis revealed that 3.2% of all genes present in strain MBLA0099T were unique to the strain. The red carotenoid produced by strain MBLA0099T was subjected to spectrometric and chromatographic analyses and confirmed to be bacterioruberin as C50 carotenoid. Mevalonic acid, terpenoid backbone, and carotenoid biosynthesis pathway were annotated for strain MBLA0099T. The C50 carotenoid production by strain MBLA0099T was also enhanced under various stress conditions including relatively netural pH, high oxidative and salinity conditions. Additionally, the strain MBLA0099T-derived bacterioruberin showed the antioxidant activity with EC50 value of 12.29 μg/ml, based on the evaluation of DPPH free radical scavenging activity. The present study would be the first report on the identification of C50 carotenoid from the strain MBLA0099T representing a novel species of the genus Halorubrum, for which the name Halorubrum ruber sp. nov. is proposed. The typestrain used was MBLA0099T (= KCTC 4296T = JCM 34701T).

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Genomic insights into Halorubrum ezzemoulense strain TC23: Genetic basis for halophilic traits and biotechnological potential
Fevziye Işıl Kesbiç
Science Progress.2025;[Epub] CrossRef
Genome-based classification of Halonovum salinarum gen. nov., sp. nov., and Halonovum rutilum sp. nov., two novel halophilic archaea isolated from a solar saltern
Chi Young Hwang, Eui-Sang Cho, Ki-Eun Lee, Eun-Young Lee, Myung-Ji Seo
BMC Microbiology.2025;[Epub] CrossRef
Optimization of bacterioruberin production from Halorubrum ruber and assessment of its antioxidant potential
Chi Young Hwang, Eui-Sang Cho, Sungjun Kim, Kyobum Kim, Myung-Ji Seo
Microbial Cell Factories.2024;[Epub] CrossRef
Microbial Bacterioruberin: A Comprehensive Review
Mouliraj Palanisamy, Sathishkumar Ramalingam
Indian Journal of Microbiology.2024; 64(4): 1477. CrossRef
Congregibacter variabilis sp. nov. and Congregibacter brevis sp. nov. Within the OM60/NOR5 Clade, Isolated from Seawater, and Emended Description of the Genus Congregibacter
Hyeonsu Tak, Miri S. Park, Hyerim Cho, Yeonjung Lim, Jang-Cheon Cho
Journal of Microbiology.2024; 62(9): 739. CrossRef
Genomic insights on carotenoid synthesis by extremely halophilic archaea Haloarcula rubripromontorii BS2, Haloferax lucentense BBK2 and Halogeometricum borinquense E3 isolated from the solar salterns of India
Devika. N. Nagar, Kabilan Mani, Judith M. Braganca
Scientific Reports.2024;[Epub] CrossRef
Microbial bacterioruberin: The new C50 carotenoid player in food industries
Cassamo U. Mussagy, Angie V. Caicedo-Paz, Fabiane O. Farias, Leonardo M. de Souza Mesquita, Daniele Giuffrida, Laurent Dufossé
Food Microbiology.2024; 124: 104623. CrossRef
Evaluation of Various Escherichia coli Strains for Enhanced Lycopene Production
Jun Ren, Junhao Shen, Thi Duc Thai, Min-gyun Kim, Seung Ho Lee, Wonseop Lim, Dokyun Na
Journal of Microbiology and Biotechnology.2023; 33(7): 973. CrossRef
Bioactive molecules from haloarchaea: Scope and prospects for industrial and therapeutic applications
Jamseel Moopantakath, Madangchanok Imchen, V. T. Anju, Siddhardha Busi, Madhu Dyavaiah, Rosa María Martínez-Espinosa, Ranjith Kumavath
Frontiers in Microbiology.2023;[Epub] CrossRef

Description of Corynebacterium poyangense sp. nov., isolated from the feces of the greater white-fronted geese (Anser albifrons): Qian Liu , Guoying Fan , Kui Wu , Xiangning Bai , Xi Yang , Wentao Song , Shengen Chen , Yanwen Xiong , Haiying Chen; J. Microbiol. 2022;60(7):668-677. Published online May 25, 2022; DOI: https://doi.org/10.1007/s12275-022-2089-9

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Two novel Gram-positive, non-spore-forming, facultatively anaerobic, non-motile, and short rods to coccoid strains were isolated from the feces of the greater white-fronted geese (Anser albifrons) at Poyang Lake. The 16S rRNA gene sequences of strains 4H37-19T and 3HC-13 shared highest identity to that of Corynebacterium uropygiale Iso10T (97.8%). Phylogenetic and phylogenomic analyses indicated that strains 4H37-19T and 3HC-13 formed an independent clade within genus Corynebacterium and clustered with Corynebacterium uropygiale Iso10T. The average nucleotide identity and digital DNA-DNA hybridization value between strains 4H37-19T and 3HC-13 and members within genus Corynebacterium were all below 95% and 70%, respectively. The genomic G + C content of strains 4H37-19T and 3HC-13 was 52.5%. Diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylinositol (PI), phosphatidylcholine, and phosphatidyl inositol mannosides (PIM) were the major polar lipids, with C18:1ω9c, C16:0, and C18:0 as the major fatty acids, and MK-8 (H4), MK-8(H2), and MK-9(H2) as the predominant respiratory quinones. The major whole cell sugar was arabinose, and the cell wall included mycolic acids. The cell wall peptidoglycan contained meso-diaminopimelic acid (meso-DAP). The polyphasic taxonomic data shows that these two strains represent a novel species of the genus Corynebacterium, for which the name Corynebacterium poyangense sp. nov. is proposed. The type strain of Corynebacterium poyangense is 4H37-19T (=GDMCC 1.1738T = KACC 21671T).

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Valid and accepted novel bacterial taxa isolated from non-domestic animals and taxonomic revisions published in 2023
Erik Munson, Claire R. Burbick, Sara D. Lawhon, Trinity Krueger, Elena Ruiz-Reyes, Romney M. Humphries
Journal of Clinical Microbiology.2024;[Epub] CrossRef
Validation List no. 212. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Keratokonjunktivitisli bir tavuktan Corynebacterium spp. ve Arcanobacterium spp. izolasyonu
Hüban GÖÇMEN, Banur BOYNUKARA
Veteriner Hekimler Derneği Dergisi.2023; 94(2): 161. CrossRef

The periplasmic chaperone protein Psg_2795 contributes to the virulence of Pseudomonas savastanoi pv. glycinea: the causal agent of bacterial blight of soybean: Xiuhua Wang , Xiaoyan Zhang , Bao-Hui Lu , Jie Gao; J. Microbiol. 2022;60(5):478-487. Published online March 4, 2022; DOI: https://doi.org/10.1007/s12275-022-1469-5

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Pseudomonas savastanoi pv. glycinea (Psg, also named P. syringae pv. glycinea and P. amygdali pv. glycinea) is the causative agent of bacterial blight in soybean. The identification of virulence factors is essential for understanding the pathogenesis of Psg. In this study, a mini-Tn5 transposon mutant library of Psg strain PsgNC12 was screened on soybean, and one low-virulent mini-Tn5 mutant, designated as 4573, was identified. Sequence analysis of the 4573-mutant revealed that the mini-Tn5 transposon was inserted in the Psg_2795 gene. Psg_2795 encodes a FimC-domain protein that is highly conserved in Pseudomonas. Further analysis revealed that the mutation and knockout of Psg_2795 results in a reduced virulence phenotype on soybean, decreased motility, weakened bacterial attachment to a glass surface and delayed the population growth within soybean leaves. The phenotype of the 4573-mutant could be complemented nearly to wild-type levels using an intact Psg_2795 gene. Collectively, our results demonstrate that Psg_2795 plays an important role in the virulence, motility, attachment and the population growth of PsgNC12 in soybean. This finding provides a new insight into the function of periplasmic chaperone proteins in a type I pilus and provides reference information for identifying Psg_2795 homologues in P. savastanoi and other bacteria.

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Vt35 antitoxin plays a central regulatory role in virulence of Pseudomonas savastanoi pv. glycinea on soybean
Viet Tru Nguyen, Nanami Sakata, Takako Ishiga, Giyu Usuki, Yoshiteru Hashimoto, Yasuhiro Ishiga
Journal of General Plant Pathology.2023; 89(4): 211. CrossRef

Characterization and validation of an alternative reference bacterium Korean Pharmacopoeia Staphylococcus aureus strain: Ye Won An , Young Sill Choi , Mi-ran Yun , Chihwan Choi , Su Yeon Kim; J. Microbiol. 2022;60(2):187-191. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1335-5

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The National Culture Collection of Pathogens (NCCP) is a microbial resource bank in Korea that collects pathogen resources causing infectious disease in human and distributes them for research and education. The NCCP bank attempts to discover strains with various characteristics and specific purposes to provide diverse resources to researchers. Staphylococcus aureus American Type Culture Collection (ATCC) 6538P is used as a reference strain in the microbial assay for antibiotics in the Korean and in the United States Pharmacopoeias. We aimed to analyze domestically isolated microbial resources from the NCCP to replace the S. aureus reference strain. Staphylococcus aureus strains were identified using matrix- assisted laser desorption/ionization time-of-flight mass spectrometry and the VITEK-2 system and characterized by multilocus sequence typing, 16S rRNA sequencing, and antibiotic susceptibility testing. Several candidate strains had similar characteristics as the reference strain. Among them, the nucleotide sequence of the 16S rRNA region of NCCP 16830 was 100% identical to that of the reference strain; it was sensitive to six types of antibiotics and showed results most similar to the reference strain. A validity evaluation was conducted using the cylinder-plate method. NCCP 16830 presented valid results and had the same performance as ATCC 6538P; therefore, it was selected as an alternative candidate strain.

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Evaluation of an alternative positive control strain of Salmonella enterica subsp. enterica serovar Typhimurium for microbial assays
Yu-Si Lee, Su-Hyeon Joung, Yongchjun Park, Seung Hwan Kim, Soon Han Kim, Insun Joo, Eun Sook An, Mohammad Faezi Ghasemi
PLOS One.2025; 20(8): e0329363. CrossRef
Development of a Domestic Alternative Positive Control Strain to Bacillus cereus ATCC 14579 for Microbial Assays
Su-Hyeon Joung, Yu-Si Lee, Byeong Joon Kim, Yongchjun Park, Seung Hwan Kim, Soon Han Kim, Insun Joo, Eun Sook An
Journal of Microbiology and Biotechnology.2025;[Epub] CrossRef
Bacterial composition of refrigerators in households and inactivation of airborne Staphylococcus aureus using a TiO2-UVLED module in a 512 L aerobiology chamber
So-Seum Yong, Jae-Ik Lee, Dong-Hyun Kang
Food Microbiology.2023; 114: 104274. CrossRef

Constantimarinum furrinae gen. nov., sp. nov., a marine bacterium isolated from saline volcanic rock aquifer (lava seawater) at Jeju Island, Republic of Korea: Sung-Hyun Yang , Hyun-Myung Oh , Mi-Jeong Park , Dongil Jang , Kae Kyoung Kwon; J. Microbiol. 2022;60(1):11-17. Published online December 29, 2021; DOI: https://doi.org/10.1007/s12275-022-1468-6

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A Gram-stain-negative, aerobic, rod-shaped (0.3–0.5 × 1.0– 1.9 μm), non-motile marine bacterium designated as ALE3EIT was isolated from a saline volcanic rock aquifer (lava seawater) on Jeju Island, Republic of Korea. The 16S rRNA gene sequence analysis revealed that strain ALE3EIT showed high similarity to ‘Altibacter lentus’ JLT2010T (97.2%), followed by Marixanthomonas ophiurae KMM 3046T (94.5%). Growth was observed at 10–41°C (optimum, 30°C), at pH 6.0–8.5 (optimum, pH 7.5) and at 0.5–8% (optimum, 4.0%) NaCl. The predominant cellular fatty acids were iso-C15:0 (23.5%), iso-C16:0 (10.2%), iso-C16:0 3OH (10.5%), and iso-C17:0 3OH (16.8%). The DNA G + C contents was 40.4 mol%. The major respiratory quinone was MK-6. The major polar lipids were determined to be phosphatidylethanolamine, two unidentified glycolipids, and two unidentified aminolipids. Several phenotypic characteristics such as production of acetoin, activities of arginine dihydrolase and acid phosphatase, and utilization pattern of carbon sources differentiate strain ALE3EIT from ‘A. lentus’ JLT2010T. Activities of the lipase, trypsin, α- chymotrypsin and gelatinase and utilization pattern of carbon sources differentiate strain ALE3EIT from M. ophiurae KMM 3046T. The genome of strain ALE3EIT is 3.0 Mbp long and its ANI and AAI values against ‘A. lentus’ JLT2010T were 76.58 and 72.76, respectively, however, AAI values against members in other genera were lower than 72%. The phylogenomic tree inferred by PhyloPhlAn clearly differentiated the strain ALE3EIT together with strain JLT2010T from other genera in the Falvobacteriaceae. This polyphasic taxonomic data indicates that strain ALE3EIT should be identified as a novel species in the genus ‘Altibacter’, however, the name has not been validated. Therefore, the strain is classified as a novel genus and is proposed as Constantimarinum furrinae gen. nov., sp. nov. The type strain is ALE3EIT (= KCCM 43303T = JCM 33022T).

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Comparative genomics analysis of Pediococcus acidilactici species: Zhenzhen Li , Qi Song , Mingming Wang , Junli Ren , Songling Liu , Shancen Zhao; J. Microbiol. 2021;59(6):573-583. Published online May 15, 2021; DOI: https://doi.org/10.1007/s12275-021-0618-6

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Pediococcus acidilactici is a reliable bacteriocin producer and a promising probiotic species with wide application in the food and health industry. However, the underlying genetic features of this species have not been analyzed. In this study, we performed a comprehensive comparative genomic analysis of 41 P. acidilactici strains from various ecological niches. The bacteriocin production of 41 strains were predicted and three kinds of bacteriocin encoding genes were identified in 11 P. acidilactici strains, namely pediocin PA-1, enterolysin A, and colicin-B. Moreover, whole-genome analysis showed a high genetic diversity within the population, mainly related to a large proportion of variable genomes, mobile elements, and hypothetical genes obtained through horizontal gene transfer. In addition, comparative genomics also facilitated the genetic explanation of the adaptation for host environment, which specify the protection mechanism against the invasion of foreign DNA (i.e. CRISPR/Cas locus), as well as carbohydrate fermentation. The 41 strains of P. acidilactici can metabolize a variety of carbon sources, which enhances the adaptability of this species and survival in different environments. This study evaluated the antibacterial ability, genome evolution, and ecological flexibility of P. acidilactici from the perspective of genetics and provides strong supporting evidence for its industrial development and application.

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Structural and sequence comparisons of bacterial enoyl-CoA isomerase and enoyl-CoA hydratase: Jisub Hwang , Chang-Sook Jeong , Chang Woo Lee , Seung Chul Shin , Han-Woo Kim , Sung Gu Lee , Ui Joung Youn , Chang Sup Lee , Tae-Jin Oh , Hak Jun Kim , Hyun Park , Hyun Ho Park , Jun Hyuck Lee; J. Microbiol. 2020;58(7):606-613. Published online April 22, 2020; DOI: https://doi.org/10.1007/s12275-020-0089-1

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Crystal structures of enoyl-coenzyme A (CoA) isomerase from Bosea sp. PAMC 26642 (BoECI) and enoyl-CoA hydratase from Hymenobacter sp. PAMC 26628 (HyECH) were determined at 2.35 and 2.70 Å resolution, respectively. BoECI and HyECH are members of the crotonase superfamily and are enzymes known to be involved in fatty acid degradation. Structurally, these enzymes are highly similar except for the orientation of their C-terminal helix domain. Analytical ultracentrifugation was performed to determine the oligomerization states of BoECI and HyECH revealing they exist as trimers in solution. However, their putative ligand-binding sites and active site residue compositions are dissimilar. Comparative sequence and structural analysis revealed that the active site of BoECI had one glutamate residue (Glu135), this site is occupied by an aspartate in some ECIs, and the active sites of HyECH had two highly conserved glutamate residues (Glu118 and Glu138). Moreover, HyECH possesses a salt bridge interaction between Glu98 and Arg152 near the active site. This interaction may allow the catalytic Glu118 residue to have a specific conformation for the ECH enzyme reaction. This salt bridge interaction is highly conserved in known bacterial ECH structures and ECI enzymes do not have this type of interaction. Collectively, our comparative sequential and structural studies have provided useful information to distinguish and classify two similar bacterial crotonase superfamily enzymes.

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User guide for the discovery of potential drugs via protein structure prediction and ligand docking simulation: Bilal Shaker , Myung-Sang Yu , Jingyu Lee , Yongmin Lee , Chanjin Jung , Dokyun Na; J. Microbiol. 2020;58(3):235-244. Published online February 27, 2020; DOI: https://doi.org/10.1007/s12275-020-9563-z

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Due to accumulating protein structure information and advances in computational methodologies, it has now become possible to predict protein-compound interactions. In biology, the classic strategy for drug discovery has been to manually screen multiple compounds (small scale) to identify potential drug compounds. Recent strategies have utilized computational drug discovery methods that involve predicting target protein structures, identifying active sites, and finding potential inhibitor compounds at large scale. In this protocol article, we introduce an in silico drug discovery protocol. Since multi-drug resistance of pathogenic bacteria remains a challenging problem to address, UDP-N-acetylmuramate- L-alanine ligase (murC) of Acinetobacter baumannii was used as an example, which causes nosocomial infection in hospital setups and is responsible for high mortality worldwide. This protocol should help microbiologists to expand their knowledge and research scope.

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Garden microbiomes of Apterostigma dentigerum and Apterostigma pilosum fungus-growing ants (Hymenoptera: Formicidae): Cely T. González , Kristin Saltonstall , Hermógenes Fernández-Marín; J. Microbiol. 2019;57(10):842-851. Published online August 3, 2019; DOI: https://doi.org/10.1007/s12275-019-8639-0

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Fungus-growing ants share a complex symbiosis with microbes, including fungal mutualists, antibiotic-producing bacteria, and fungal pathogens. The bacterial communities associated with this symbiosis are poorly understood but likely play important roles in maintaining the health and function of fungal gardens. We studied bacterial communities in gardens of two Apterostigma species, A. dentigerum, and A. pilosum, using next-generation sequencing to evaluate differences between the two ant species, their veiled and no-veiled fungal garden types, and across three collection locations. We also compared different parts of nests to test for homogeneity within nests. Enterobacteriaceae dominated gardens of both species and common OTUs were shared across both species and nest types. However, differences in community diversity were detected between ant species, and in the communities of A. dentigerum veiled and no-veiled nests within sites. Apterostigma pilosum had a higher proportion of Phyllobacteriaceae and differed from A. dentigerum in the proportions of members of the order Clostridiales. Within A. dentigerum, nests with veiled and no-veiled fungus gardens had similar taxonomic profiles but differed in the relative abundance of some groups, with veiled gardens having more Rhodospirillaceae and Hyphomicrobiaceae, and no-veiled having more Xanthomonadaceae and certain genera in the Enterobacteriaceae C. However, bacterial communities in Apterostigma fungal gardens are highly conserved and resemble those of the nests of other attine ants with dominant taxa likely playing a role in biomass degradation and defense. Further work is required to understand and explain how bacterial community composition of fungus-growing nests is maintained.

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Review

REVIEW] Recent paradigm shift in the assembly of bacterial tripartite efflux pumps and the type I secretion system: Inseong Jo , Jin-Sik Kim , Yongbin Xu , Jaekyung Hyun , Kangseok Lee , Nam-Chul Ha; J. Microbiol. 2019;57(3):185-194. Published online February 26, 2019; DOI: https://doi.org/10.1007/s12275-019-8520-1

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Tripartite efflux pumps and the type I secretion system of Gram-negative bacteria are large protein complexes that span the entire cell envelope. These complexes expel antibiotics and other toxic substances or transport protein toxins from bacterial cells. Elucidating the binary and ternary complex structures at an atomic resolution are crucial to understanding the assembly and working mechanism. Recent advances in cryoelectron microscopy along with the construction of chimeric proteins drastically shifted the assembly models. In this review, we describe the current assembly models from a historical perspective and emphasize the common assembly mechanism for the assembly of diverse tripartite pumps and type I secretion systems.

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Community structures and genomic features of undesirable white colony-forming yeasts on fermented vegetables: Joon Yong Kim , Juseok Kim , In-Tae Cha , Min Young Jung , Hye Seon Song , Yeon Bee Kim , Changsu Lee , Seung-Yeon Kang , Jin-Woo Bae , Yoon-E Choi , Tae-Woon Kim , Seong Woon Roh; J. Microbiol. 2019;57(1):30-37. Published online October 25, 2018; DOI: https://doi.org/10.1007/s12275-019-8487-y

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White colony-forming yeasts (WCFYs) often appear in fermented foods, depending on the storage method. Despite the ongoing research on fermented foods, the community and genome features of WCFYs have not been well studied. In this study, the community structures of WCFYs on fermented vegetables (kimchi) prepared with various raw materials were investigated using deep sequencing. Only eight operational taxonomic units (OTUs) were detected, indicating that the community structure of WCFYs on kimchi is very simple. The five most abundant OTUs represented Pichia kluyveri, Yarrowia lipolytica, Candida sake, Hanseniaspora uvarum, and Kazachstania servazzii. Using a culture-dependent
method
, 41 strains representing the five major OTUs were isolated from the surface of the food samples. Whole genomes of the five major yeast strains were sequenced and annotated. The total genome length for the strains ranged from 8.97 Mbp to 21.32 Mbp. This is the first study to report genome sequences of the two yeasts Pichia kluyveri and Candida sake. Genome analysis indicated that each yeast strain had core metabolic pathways such as oxidative phosphorylation; purine metabolism; glycolysis/gluconeogenesis; aminoacyl- tRNA biosynthesis; citrate cycle; but strain specific pathways were also found. In addition, no toxin or antimicrobial resistance genes were identified. Our study provides genome information for five WCFY strains that may highlight their potential beneficial or harmful metabolic effects in fermented vegetables.

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Pseudomonas aeruginosa, an opportunistic human pathogen, causes many biofilm-mediated chronic infections. In this study, biofilm structures of various clinical strains of P. aeruginosa isolated from hospitalized patients were examined and their influence on the biofilm-dispersing effects of chemicals was investigated. The clinical isolates formed structurally distinct biofilms that could be classified into three different groups: 1) mushroom-like, 2) thin flat, and 3) thick flat structures. A dispersion of these differently structured biofilms was induced using two biofilm-dispersing agents, anthranilate and sodium nitroprusside (SNP). Although both SNP and anthranilate could disperse all types of biofilms, the thick flat biofilms were dispersed less efficiently than the biofilms of other structures. This suggests that biofilm-dispersing agents have higher potency on the biofilms of porous structures than on densely packed biofilms.

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Evidence of the genetic diversity and clonal population structure of Oenococcus oeni strains isolated from different wine-making regions of China: Dongliang Yu , Kan Shi , Xiangyuan Wen , Fangshu Xie , Tao Wang , Shuwen Liu , Ling He; J. Microbiol. 2018;56(8):556-564. Published online July 25, 2018; DOI: https://doi.org/10.1007/s12275-018-7568-7

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Studies of the genetic diversity and population structure of Oenococcus oeni (O. oeni) strains from China are lacking compared to other countries and regions. In this study, amplified fragment length polymorphism (AFLP) and multilocus sequence typing (MLST) methods were used to investigate the genetic diversity and regional evolutionary patterns of 38 O. oeni strains isolated from different wine-making regions in China. The results indicated that AFLP was markedly more efficient than MLST for typing O. oeni strains. AFLP distinguished 37 DNA patterns compared to 7 sequence types identified using MLST, corresponding to discriminatory indices of 0.999 and 0.602, respectively. The AFLP results revealed a high level of genetic diversity among the O. oeni strains from different regions of China, since two subpopulations and an intraspecific homology higher than 60% were observed. Phylogenetic analysis of the O. oeni strains using the MLST method also identified two major phylogroups, which were differentiated into two distinct clonal complexes by minimum spanning tree analysis. Neither intragenic nor intergenic recombination verified the existence of the clonal population structure of the O. oeni strains.

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[PROTOCOL] Structural analysis of N-/O-glycans assembled on proteins in yeasts: Eun Jung Thak , Jungho Kim , Dong-Jik Lee , Jeong Yoon Kim , Hyun Ah Kang; J. Microbiol. 2018;56(1):11-23. Published online January 4, 2018; DOI: https://doi.org/10.1007/s12275-018-7468-x

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Protein glycosylation, the most universal and diverse posttranslational modification, can affect protein secretion, stability, and immunogenicity. The structures of glycans attached to proteins are quite diverse among different organisms and even within yeast species. In yeast, protein glycosylation plays key roles in the quality control of secretory proteins, and particularly in maintaining cell wall integrity. Moreover, in pathogenic yeasts, glycans assembled on cell-surface glycoproteins can mediate their interactions with host cells. Thus, a comprehensive understanding of protein glycosylation in various yeast species and defining glycan structure characteristics can provide useful information for their biotechnological and clinical implications. Yeast-specific glycans are a target for glyco-engineering; implementing human-type glycosylation pathways in yeast can aid the production of recombinant glycoproteins with therapeutic potential. The virulenceassociated glycans of pathogenic yeasts could be exploited as novel targets for antifungal agents. Nowadays, several glycomics techniques facilitate the generation of species- and strain-specific glycome profiles and the delineation of modified glycan structures in mutant and engineered yeast cells. Here, we present the protocols employed in our laboratory to investigate the N- and O-glycan chains released from purified glycoproteins or cell wall mannoproteins in several yeast species.

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Crystal structure of Streptomyces coelicolor RraAS2, an unusual member of the RNase E inhibitor RraA protein family: Nohra Park , Jihune Heo , Saemee Song , Inseong Jo , Kangseok Lee , Nam-Chul Ha; J. Microbiol. 2017;55(5):388-395. Published online April 29, 2017; DOI: https://doi.org/10.1007/s12275-017-7053-8

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Bacterial ribonuclease E (RNase E) plays a crucial role in the processing and decay of RNAs. A small protein named RraA negatively regulates the activity of RNase E via protein-protein interaction in various bacteria. Recently, RraAS1 and RraAS2, which are functional homologs of RraA from Escherichia coli, were identified in the Gram-positive species Streptomyces coelicolor. RraAS1 and RraAS2 inhibit RNase ES ribonuclease activity in S. coelicolor. RraAS1 and RraAS2 have a C-termi-nal extension region unlike typical bacterial RraA proteins. In this study, we present the crystal structure of RraAS2, ex-hibiting a hexamer arranged in a dimer of trimers, consistent with size exclusion chromatographic results. Importantly, the C-terminal extension region formed a long α-helix at the junction of the neighboring subunit, which is similar to the trimeric RraA orthologs from Saccharomyces cerevisiae. Trun-cation of the C-terminal extension region resulted in loss of RNase ES inhibition, demonstrating its crucial role. Our find-ings present the first bacterial RraA that has a hexameric assembly with a C-terminal extension α-helical region, which plays an essential role in the regulation of RNase ES activity in S. coelicolor.

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Alteration in the ultrastructural morphology of mycelial hyphae and the dynamics of transcriptional activity of lytic enzyme genes during basidiomycete morphogenesis: Elena Vetchinkina , Maria Kupryashina , Vladimir Gorshkov , Marina Ageeva , Yuri Gogolev , Valentina Nikitina; J. Microbiol. 2017;55(4):280-288. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6320-z

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The morphogenesis of macromycetes is a complex multilevel process resulting in a set of molecular-genetic, physiological- biochemical, and morphological-ultrastructural changes in the cells. When the xylotrophic basidiomycetes Lentinus edodes, Grifola frondosa, and Ganoderma lucidum were grown on wood waste as the substrate, the ultrastructural morphology of the mycelial hyphal cell walls differed considerably between mycelium and morphostructures. As the macromycetes passed from vegetative to generative development, the expression of the tyr1, tyr2, chi1, chi2, exg1, exg2, and exg3 genes was acti-vated. These genes encode enzymes such as tyrosinase, chi-tinase, and glucanase, which play essential roles in cell wall growth and morphogenesis.

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Review

MINIREVIEW] High-resolution imaging of the microbial cell surface: Ki Woo Kim; J. Microbiol. 2016;54(11):703-708. Published online October 29, 2016; DOI: https://doi.org/10.1007/s12275-016-6348-5

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Microorganisms, or microbes, can function as threatening pathogens that cause disease in humans, animals, and plants; however, they also act as litter decomposers in natural ecosystems. As the outermost barrier and interface with the environment, the microbial cell surface is crucial for cell-to-cell communication and is a potential target of chemotherapeutic agents. Surface ultrastructures of microbial cells have typically been observed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Owing to its characteristics of low-temperature specimen preparation and superb resolution (down to 1 nm), cryo-field emission SEM has revealed paired rodlets, referred to as hydrophobins, on the cell walls of bacteria and fungi. Recent technological advances in AFM have enabled high-speed live cell imaging in liquid at the nanoscale level, leading to clear visualization of celldrug interactions. Platinum-carbon replicas from freeze-fractured fungal spores have been observed using transmission electron microscopy, revealing hydrophobins with varying dimensions. In addition, AFM has been used to resolve bacteriophages in their free state and during infection of bacterial cells. Various microscopy techniques with enhanced spatial resolution, imaging speed, and versatile specimen preparation are being used to document cellular structures and events, thus addressing unanswered biological questions.

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Journal Articles

Vertical distribution of bacterial community is associated with the degree of soil organic matter decomposition in the active layer of moist acidic tundra: Hye Min Kim , Min Jin Lee , Ji Young Jung , Chung Yeon Hwang , Mincheol Kim , Hee-Myong Ro , Jongsik Chun , Yoo Kyung Lee; J. Microbiol. 2016;54(11):713-723. Published online October 29, 2016; DOI: https://doi.org/10.1007/s12275-016-6294-2

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The increasing temperature in Arctic tundra deepens the active layer, which is the upper layer of permafrost soil that experiences repeated thawing and freezing. The increasing of soil temperature and the deepening of active layer seem to affect soil microbial communities. Therefore, information on soil microbial communities at various soil depths is essential to understand their potential responses to climate change in the active layer soil. We investigated the community structure of soil bacteria in the active layer from moist acidic tundra in Council, Alaska. We also interpreted their relationship with some relevant soil physicochemical characteristics along soil depth with a fine scale (5 cm depth interval). The bacterial community structure was found to change along soil depth. The relative abundances of Acidobacteria, Gammaproteobacteria, Planctomycetes, and candidate phylum WPS-2 rapidly decreased with soil depth, while those of Bacteroidetes, Chloroflexi, Gemmatimonadetes, and candidate AD3 rapidly increased. A structural shift was also found in the soil bacterial communities around 20 cm depth, where two organic (upper Oi and lower Oa) horizons are subdivided. The quality and the decomposition degree of organic matter might have influenced the bacterial community structure. Besides the organic matter quality, the vertical distribution of bacterial communities was also found to be related to soil pH and total phosphorus content. This study showed the vertical change of bacterial community in the active layer with a fine scale resolution and the possible influence of the quality of soil organic matter on shaping bacterial community structure.

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Intestinal Lactobacillus community structure and its correlation with diet of Southern Chinese elderly subjects§: Yuanyuan Pan , Da-Wen Sun , Quanyang Li; J. Microbiol. 2016;54(9):594-601. Published online August 31, 2016; DOI: https://doi.org/10.1007/s12275-016-6131-7

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Abstract PDF

This study aimed to investigate the relationship between the intestinal Lactobacillus species and diet of elderly subjects in a longevity area in Southern China. Healthy elderly subjects ranging from 80 to 99 years old were respectively selected from the regions of Bama and Nanning, Guangxi, China. The nested polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE) technology was used to analyze the intestinal Lactobacillus community structure.
Results
showed that Weissella confusa, L. mucosae, L. crispatus, L. salivarius, and L. delbrueckii were the representative Lactobacillus of elderly subjects. Among them, L. crispatus and L. delbrueckii were the dominant Lactobacillus of all species. In comparison to Nanning elderly subjects, the detection frequencies of W. confusa and L. salivarius were significantly increased in Bama elderly subjects (P < 0.01), whereas L. mucosae was significantly decreased (P < 0.01). Interestingly, it was also found that there were 4 kinds of representative Lactobacillus, which were significantly correlated with dietary fiber. W. confusa (P < 0.01) and L. salivarius (P < 0.05) were significantly positively correlated with the intake of dietary fiber, while L. mucosae (P < 0.01) and L. crispatus (P < 0.05) were significantly negatively correlated with the intake of dietary fiber, respectively. Results confirmed that different diets had obvious effects on the intestinal Lactobacillus community structure of elderly subjects in Southern China, which may provide a certain theoretical basis for the elderly’s healthy food strategic design and probiotics product development.

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Mingzheng Duan, Muhammad Junaid Rao, Qing Li, Falin Zhao, Hongzeng Fan, Bo Li, Dandan He, Shijian Han, Jiangjiang Zhang, Lingqiang Wang
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Dominant genera of cyanobacteria in Lake Taihu and their relationships with environmental factors: Lijun Feng , Shiyou Liu , Wenxian Wu , Jiawen Ma , Pei Li , Hailing Xu , Na Li , Yaoyu Feng; J. Microbiol. 2016;54(7):468-476. Published online June 28, 2016; DOI: https://doi.org/10.1007/s12275-016-6037-4

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Abstract PDF

Cyanobacterial blooms in freshwaters have become one of the most widespread of environmental problems and threaten water resources worldwide. Previous studies on cyanobacteria in Lake Taihu often collected samples from one site (like Meiliang Bay or Zhushan Bay) and focused on the variation in patterns or abundance of Microcystis during the blooming season. However, the distribution of cyanobacteria in Lake Taihu shows differing pattern in various seasons. In this study, water samples were collected monthly for one year at five sites in Lake Taihu with different trophic status and a physicochemical analysis and denaturing gradient gel electrophoresis (DGGE) were conducted. DGGE fingerprint analysis showed that Microcystis (7/35 bands) and Synechococcus (12/35 bands) were the two most dominant genera present during the study period at all five sites. Cyanobium (3/35 bands) was the third most common genus which has seldom been previously reported in Lake Taihu. Redundancy analysis (RDA) indicated that the cyanobacterial community structure was significantly correlated with NO3 --N, CODMn, and NH4 +-N in the winter and spring, whereas it was correlated with water temperature in the summer and autumn. Limiting the nutrient input (especially of N and C loading) in Lake Taihu would be a key factor in controlling the growth of different genera of cyanobacteria.

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Zhenyan Zhang, Xiaoji Fan, W.J.G.M. Peijnenburg, Meng Zhang, Liwei Sun, Yujia Zhai, Qi Yu, Juan Wu, Tao Lu, Haifeng Qian
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Xiao Tan, Huihui Gu, Yinlan Ruan, Jiajia Zhong, Keshab Parajuli, Jianyong Hu
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Xiao Tan, Huihui Gu, Xidong Zhang, Keshab Parajuli, Zhipeng Duan
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Long Jiang, Yiping Li, Xu Zhao, Martin R. Tillotson, Wencai Wang, Shuangshuang Zhang, Linda Sarpong, Qhtan Asmaa, Baozhu Pan
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Research Support, Non-U.S. Gov't

Comparing the sugar profiles and primary structures of alkali-extracted water-soluble polysaccharides in cell wall between the yeast and mycelial phases from Tremella fuciformis: Hanyu Zhu , Yuan Yuan , Juan Liu , Liesheng Zheng , Liguo Chen , Aimin Ma; J. Microbiol. 2016;54(5):381-386. Published online April 20, 2016; DOI: https://doi.org/10.1007/s12275-016-5533-x

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Abstract PDF

To gain insights into dimorphism, cell wall polysaccharides from Tremella fuciformis strains were obtained from alkaliextracted water-soluble fractions PTF-M38 (from the mycelial form), PTF-Y3 and PTF-Y8 (from the yeast form) of T. fuciformis strains were used to gain some insights into dimorphism study. Their chemical properties and structural features were investigated using gel permeation chromatography, gas chromatography, UV and IR spectrophotometry and Congo red binding reactions. The results indicated that the backbones of PTF-M38, PTF-Y3 and PTF-Y8 were configured with α-linkages with average molecular weights of 1.24, 1.08, and 1.19 kDa, respectively. PTF-M38 was mainly composed of xylose, mannose, glucose, and galactose in a ratio of 1:1.47:0.48:0.34, while PTF-Y3 and PTF-Y8 were mainly composed of xylose, mannose and glucose in a ratio of 1:1.65:4.06 and 1:1.21:0.44, respectively. The sugar profiles of PTF-M38, PTF-Y3 and PTF-Y8 were also established for further comparison. These profiles showed that all three polysaccharides contained the same sugars but in different ratios, and the carbon sources (xylose, mannose, glucose, and galactose) affected the sugar ratios within the polysaccharides.

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Journal Article

Molecular diversity and distribution of indigenous arbuscular mycorrhizal communities colonizing roots of two different winter cover crops in response to their root proliferation: Masao Higo , Katsunori Isobe , Yusuke Miyazawa , Yukiya Matsuda , Rhae A. Drijber , Yoichi Torigoe; J. Microbiol. 2016;54(2):86-97. Published online February 2, 2016; DOI: https://doi.org/10.1007/s12275-016-5379-2

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Abstract PDF

A clear understanding of how crop root proliferation affects the distribution of the spore abundance of arbuscular mycorrhizal fungi (AMF) and the composition of AMF communities in agricultural fields is imperative to identify the potential roles of AMF in winter cover crop rotational systems. Toward this goal, we conducted a field trial using wheat (Triticum aestivum L.) or red clover (Trifolium pratense L.) grown during the winter season. We conducted a molecular analysis to compare the diversity and distribution of AMF communities in roots and spore abundance in soil cropped with wheat and red clover. The AMF spore abundance, AMF root colonization, and abundance of root length were investigated at three different distances from winter crops (0 cm, 7.5 cm, and 15 cm), and differences in these variables were found between the two crops. The distribution of specific AMF communities and variables responded to the two winter cover crops. The majority of Glomerales phylotypes were common to the roots of both winter cover crops, but Gigaspora phylotypes in Gigasporales were found only in red clover roots. These
results
also demonstrated that the diversity of the AMF colonizing the roots did not significantly change with the three distances from the crop within each rotation but was strongly influenced by the host crop identity. The distribution of specific AMF phylotypes responded to the presence of wheat and red clover roots, indicating that the host crop identity was much more important than the proliferation of crop roots in determining the diversity of the AMF communities.

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Reviews

MINIREVIEW] Histone deacetylase-mediated morphological transition in Candida albicans: Jueun Kim , Ji-Eun Lee , Jung-Shin Lee; J. Microbiol. 2015;53(12):805-811. Published online December 2, 2015; DOI: https://doi.org/10.1007/s12275-015-5488-3

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Abstract

Candida albicans is the most common opportunistic fungal pathogen, which switches its morphology from single-cell yeast to filament through the various signaling pathways responding to diverse environmental cues. Various transcriptional factors such as Nrg1, Efg1, Brg1, Ssn6, and Tup1 are the key components of these signaling pathways. Since C. albicans can regulate its transcriptional gene expressions using common eukaryotic regulatory systems, its morphological transition by these signaling pathways could be linked to the epigenetic regulation by chromatin structure modifiers. Histone proteins, which are critical components of eukaryotic chromatin structure, can regulate the eukaryotic chromatin structure through their own modifications such as acetylation, methylation, phosphorylation and ubiquitylation. Recent studies revealed that various histone modifications, especially histone acetylation and deacetylation, participate in morphological transition of C. albicans collaborating with well-known transcription factors in the signaling pathways. Here, we review recent studies about chromatin-mediated morphological transition of C. albicans focusing on the interaction between transcription factors in the signaling pathways and histone deacetylases.

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MINIREVIEW] Molecular architecture of the bacterial tripartite multidrug efflux pump focusing on the adaptor bridging model: Saemee Song , Jin-Sik Kim , Kangseok Lee , Nam-Chul Ha; J. Microbiol. 2015;53(6):355-364. Published online May 30, 2015; DOI: https://doi.org/10.1007/s12275-015-5248-4

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Abstract

Gram-negative bacteria expel a wide range of toxic substances through tripartite drug efflux pumps consisting of an inner membrane transporter, an outer membrane channel protein, and a periplasmic adaptor protein. These pumps form tripartite assemblies which can span the entire cell envelope, including the inner and outer membranes. There have been controversial findings regarding the assembly of the individual components in tripartite drug efflux pumps. Recent structural and functional studies have advanced our understanding of the assembly and working mechanisms of the pumps. Here, we re-evaluate the assembly models based on recent structural and functional studies. In particular, this study focuses on the ‘adaptor bridging model’, highlighting the intermeshing cogwheel-like interactions between the tip regions of the outer membrane channel protein and the periplasmic adaptor protein in the hexameric assembly.

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Research Support, Non-U.S. Gov'ts

Effect of Long-Term Different Fertilization on Bacterial Community Structures and Diversity in Citrus Orchard Soil of Volcanic Ash: Jae Ho Joa , Hang Yeon Weon , Hae Nam Hyun , Young Chull Jeun , Sang Wook Koh; J. Microbiol. 2014;52(12):995-1001. Published online November 29, 2014; DOI: https://doi.org/10.1007/s12275-014-4129-6

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Abstract PDF

This study was conducted to assess bacterial species richness, diversity and community distribution according to different fertilization regimes for 16 years in citrus orchard soil of volcanic ash. Soil samples were collected and analyzed from Compost (cattle manure, 2,000 kg/10a), 1/2 NPK+compost (14-20-14+2,000 kg/10a), NPK+compost (28-40-28+2,000 kg/10a), NPK (28-40-28 kg/10a), 3 NPK (84-120-84 kg/10a), and Control (no fertilization) plot which have been managed in the same manners with compost and different amount of chemical fertilization. The range of pyrosequencing reads and OTUs were 4,687–7,330 and 1,790–3,695, respectively. Species richness estimates such as Ace, Chao1, and Shannon index were higher in 1/2 NPK+compost than other treatments, which were 15,202, 9,112, 7.7, respectively. Dominant bacterial groups at level of phylum were Proteobacteria, Acidobacteria, and Actinobacteria. Those were occupied at 70.9% in 1/2 NPK+compost. Dominant bacterial groups at level of genus were Pseudolabrys, Bradyrhizobium, and Acidobacteria. Those were distributed at 14.4% of a total of bacteria in Compost. Soil pH displayed significantly closely related to bacterial species richness estimates such as Ace, Chao1 (p<0.05) and Shannon index (p<0.01). However, it showed the negative correlation with exchangeable aluminum contents (p<0.05). In conclusion, diversity of bacterial community in citrus orchard soil was affected by fertilization management, soil pH changes and characteristics of volcanic ash.

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Function of VP2 Protein in the Stability of the Secondary Structure of Virus-like Particles of Genogroup II Norovirus at Different pH Levels: Function of VP2 Protein in the Stability of NoV VLPs: Yao Lin , Li Fengling , Wang Lianzhu , Zhai Yuxiu , Jiang Yanhua; J. Microbiol. 2014;52(11):970-975. Published online October 3, 2014; DOI: https://doi.org/10.1007/s12275-014-4323-6

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Abstract PDF

VP2 is the minor structural protein of noroviruses (NoV) and may function in NoV particle stability. To determine the function of VP2 in the stability of the NoV particle, we constructed and purified two kinds of virus-like particles (VLPs), namely, VLPs (VP1) and VLPs (VP1+VP2), from Sf9 cells infected with recombinant baculoviruses by using a Bac-to-Bac? baculovirus expression system. The two kinds of VLPs were treated with different phosphate buffers (pH 2 to pH 8); the secondary structure was then analyzed by far UV circular dichroism (CD) spectroscopy. Results showed that significant disruptions of the secondary structure of proteins were not observed at pH 2 to pH 7. At pH 8, the percentages of α-helix, β-sheet, and β-turn in VLPs (VP1) were decreased from 11% to 8%, from 37% to 32%, and from 20% to 16%, respectively. The percentage of coil was increased from 32% to 44%. By contrast, the percentages of α-helix, β-sheet, and β-turn in VLPs (VP1+VP2) were decreased from 11% to 10%, from 37% to 35%, and from 20% to 19%, respectively. The percentage of coil was increased from 32% to 36%. VLPs (VP1+VP2) was likely more stable than VLPs (VP1), as indicated by the percentage of the secondary structures analyzed by CD. These results suggested that VP2 could stabilize the secondary structure of VLPs under alkaline pH conditions. This study provided novel insights into the molecular mechanism of the function of VP2 in the stability of NoV particles.

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Prediction of Bacterial microRNAs and Possible Targets in Human Cell Transcriptome: Amir Shmaryahu , Margarita Carrasco , Pablo D.T. Valenzuela; J. Microbiol. 2014;52(6):482-489. Published online May 29, 2014; DOI: https://doi.org/10.1007/s12275-014-3658-3

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Recent studies have examined gene transfer from bacteria to humans that would result in vertical inheritance. Bacterial DNA appears to integrate into the human somatic genome through an RNA intermediate, and such integrations are detected more frequently in tumors than normal samples and in RNA than DNA samples. Also, vertebrate viruses encode products that interfere with the RNA silencing machinery, suggesting that RNA silencing may indeed be important for antiviral responses in vertebrates. RNA silencing in response to virus infection could be due to microRNAs encoded by either the virus or the host. We hypothesized that bacterial expression of RNA molecules with secondary structures is potentially able to generate miRNA molecules that can interact with the human host mRNA during bacterial infection. To test this hypothesis, we developed a pipelinebased bioinformatics approach to identify putative micro-RNAs derived from bacterial RNAs that may have the potential to regulate gene expression of the human host cell. Our results suggest that 68 bacterial RNAs predicted from 37 different bacterial genomes have predicted secondary structures potentially able to generate putative microRNAs that may interact with messenger RNAs of genes involved in 47 different human diseases. As an example, we examined the effect of transfecting three putative microRNAs into human embryonic kidney 293 (HEK293) cells. The results show that the bacterially derived microRNA sequence can significantly regulate the expression of the respective target human gene. We suggest that the study of these predicted microRNAs may yield important clues as to how the human host cell processes involved in human diseases like cancer, diabetes, rheumatoid arthritis, and others may respond to a particular bacterial environment.

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Line Strand Karlsholm, Rafi Ahmad, Hagar Taman, Christopher G. Fenton, Ruth H. Paulssen
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Core non-coding RNAs of Piscirickettsia salmonis
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X-ray Structure of Prephenate Dehydratase from Streptococcus mutans: Min Hyung Shin , Hyung-Keun Ku , Jin Sue Song , Saehae Choi , Se Young Son , Hee-Dai Kim , Sook-Kyung Kim , Il Yeong Park , Soo Jae Lee; J. Microbiol. 2014;52(6):490-495. Published online March 7, 2014; DOI: https://doi.org/10.1007/s12275-014-3645-8

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Prephenate dehydratase is a key enzyme of the biosynthesis of L-phenylalanine in the organisms that utilize shikimate pathway. Since this enzymatic pathway does not exist in mammals, prephenate dehydratase can provide a new drug targets for antibiotics or herbicide. Prephenate dehydratase is an allosteric enzyme regulated by its end product. The enzyme composed of two domains, catalytic PDT domain located near the N-terminal and regulatory ACT domain located near the C-terminal. The allosteric enzyme is suggested to have two different conformations. When the regulatory molecule, phenylalanine, is not bound to its ACT domain, the catalytic site of PDT domain maintain open (active) state conformation as Sa-PDT structure. And the open state of its catalytic site become closed (allosterically inhibited) state if the regulatory molecule is bound to its ACT domain as Ct-PDT structure. However, the X-ray structure of prephenate dehydratase from Streptococcus mutans (Sm-PDT) shows that the catalytic site of Sm-PDT has closed state conformation without phenylalanine molecule bound to its regulatory site. The structure suggests a possibility that the binding of phenylalanine in its regulatory site may not be the only prerequisite for the closed state conformation of Sm-PDT.

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Comparative Phylogenetic Relationships and Genetic Structure of the Caterpillar Fungus Ophiocordyceps sinensis and Its Host Insects Inferred from Multiple Gene Sequences: Qing-Mei Quan , Qing-Xia Wang , Xue-Li Zhou , Shan Li , Xiao-Ling Yang , Yun-Guo Zhu , Zhou Cheng; J. Microbiol. 2014;52(2):99-105. Published online February 1, 2014; DOI: https://doi.org/10.1007/s12275-014-3391-y

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Ophiocordyceps sinensis (Ascomycota: Ophiocordycipitaceae) is a native fungal parasite of Hepialidae caterpillars and one of the most economically important medicinal caterpillar fungi in China. However, little is known about the phylogenetic and evolutionary relationships between O. sinensis and its host insects. In this study, nuclear ITS and β-tubulin sequences from O. sinensis and mitochondrial COI, COII, and Cytb sequences from its hosts were analyzed across 33 populations sampled from five regions in China. Phylogenetically, both O. sinensis and its hosts were divided into three geographically correlated clades, and their phylogenies were congruent. Analysis of molecular variance and calculated coefficients of genetic differentiation revealed significant genetic divergence among the clades within both O. sinensis (FST=0.878, NST=0.842) and its hosts (FST=0.861, NST=0.816). Estimated gene flow was very low for O. sinensis (Nm=0.04) and the host insects (Nm=0.04) among these three clades. Mantel tests demonstrated a significant correlation (P<0.01) between the genetic distances for O. sinensis and its hosts, as well as a significant association (P<0.05) between geographic and genetic distances in both. The similar phylogenetic relationships, geographic distributions, and genetic structure and differentiation between O. sinensis and its hosts imply that they have coevolved.

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Guoliang Meng, Fen Wang, Caihong Dong
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Crystal Structure of XoLAP, a Leucine Aminopeptidase, from Xanthomonas oryzae pv. oryzae: Jin-Kwang Kim , Sampath Natarajan , Hanseul Park , Kim-Hung Huynh , Sang Hee Lee , Jeong-Gu Kim , Yeh-Jin Ahn , Lin-Woo Kang; J. Microbiol. 2013;51(5):627-632. Published online October 31, 2013; DOI: https://doi.org/10.1007/s12275-013-3234-2

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Aminopeptidases are metalloproteinases that degrade N-terminal residues from protein and play important roles in cell growth and development by controlling cell homeostasis and protein maturation. We determined the crystal structure of XoLAP, a leucyl aminopeptidase, at 2.6 Å resolution from Xanthomonas oryzae pv. oryzae, causing the destructive rice disease of bacterial blight. It is the first crystal structure of aminopeptidase from phytopathogens as a drug target. XoLAP existed as a hexamer and the monomer structure consisted of an N-terminal cap domain and a C-terminal peptidase domain with two divalent zinc ions. XoLAP structure was compared with BlLAP and EcLAP (EcPepA) structures. Based on the structural comparison, the molecular model of XoLAP in complex with the natural aminopeptidase inhibitor of microginin FR1 was proposed. The model structure will be useful to develop a novel antibacterial drug against Xoo.

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Genetic Diversity and Population Structure of Escherichia coli from Neighboring Small-Scale Dairy Farms: Jesús Andrei Rosales-Castillo , Ma. Soledad Vázquez-Garcidueñas , Hugo Álvarez-Hernández , Omar Chassin-Noria , Alba Irene Varela-Murillo , María Guadalupe Zavala-Páramo , Horacio Cano-Camacho , Gerardo Vázquez-Marrufo; J. Microbiol. 2011;49(5):693-702. Published online November 9, 2011; DOI: https://doi.org/10.1007/s12275-011-0461-2

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Abstract PDF: The genetic diversity and population structure of Escherichia coli isolates from small-scale dairy farms were used to assess the ability of E. coli to spread within the farm environment and between neighboring farms. A total of 164 E. coli isolates were obtained from bovine feces, bedding, cow teats and milk from 6 small-scale dairy farms. Ward’s clustering grouped the isolates into 54 different random amplified polymorphic DNA (RAPD) types at 95% similarity, regardless of either the sample type or the farm of isolation. This suggests that RAPD types are shared between bovine feces, bedding, cow teats, and milk. In addition, transmission of RAPD types between the studied farms was suggested by the Ward grouping pattern of the isolates, Nei’s and AMOVA population analyses, and genetic landscape shape analysis. For the first time, the latter analytical tool was used to assess the ability of E. coli to disseminate between small-scale dairy farms within the same producing region. Although a number of dispersal mechanisms could exist between farms, the genetic landscape shape analysis associated the flow of E. coli RAPD types with the movement of forage and milking staff between farms. This study will aid in planning disease prevention strategies and optimizing husbandry practices.

Bacterial Structure and Characterization of Plant Growth Promoting and Oil Degrading Bacteria from the Rhizospheres of Mangrove Plants: Flávia Lima do Carmo , Henrique Fragoso dos Santos , Edir Ferreira Martins , Jan Dirk van Elsas , Alexandre Soares Rosado , Raquel Silva Peixoto; J. Microbiol. 2011;49(4):535-543. Published online September 2, 2011; DOI: https://doi.org/10.1007/s12275-011-0528-0

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Most oil from oceanic spills converges on coastal ecosystems, such as mangrove forests, which are threatened with worldwide disappearance. Particular bacteria that inhabit the rhizosphere of local plant species can stimulate plant development through various mechanisms; it would be advantageous if these would also be capable of degrading oil. Such bacteria may be important in the preservation or recuperation of mangrove forests impacted by oil spills. This study aimed to compare the bacterial structure, isolate and evaluate bacteria able to degrade oil and stimulate plant growth, from the rhizospheres of three mangrove plant species. These features are particularly important taking into account recent policies for mangrove bioremediation, implying that oil degradation as well as plant maintenance and health are key targets. Fifty-seven morphotypes were isolated from the mangrove rhizospheres on Bushnell-Haas (BH) medium supplemented with oil as the sole carbon source and tested for plant growth promotion. Of this strains, 60% potentially fixed nitrogen, 16% showed antimicrobial activity, 84% produced siderophores, 51% had the capacity to solubilize phosphate, and 33% produced the indole acetic acid hormone. Using gas chromatography, we evaluated the oil-degrading potential of ten selected strains that had different morphologies and showed Plant Growth Promoting Rhizobacteria (PGPR) features. The ten tested strains showed a promising degradation profile for at least one compound present in the oil. Among degrader strains, 46% had promising PGPR potential, having at least three of the above capacities. These strains might be used as a consortium, allowing the concomitant degradation of oil and stimulation of mangrove plant survival and maintenance.

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Research Support, U.S. Gov't, Non-P.H.S.

Functional Shifts in Unvegetated, Perhumid, Recently-Deglaciated Soils Do Not Correlate with Shifts in Soil Bacterial Community Composition: Sarah R. Sattin , Cory C. Cleveland , Eran Hood , Sasha C. Reed , Andrew J. King , Steven K. Schmidt , Michael S. Robeson , Nataly Ascarrunz , Diana R. Nemergut; J. Microbiol. 2009;47(6):673-681. Published online February 4, 2010; DOI: https://doi.org/10.1007/s12275-009-0194-7

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Abstract PDF

Past work in recently deglaciated soils demonstrates that microbial communities undergo shifts prior to plant colonization. To date, most studies have focused on relatively ‘long’ chronosequences with the ability to sample plant-free sites over at least 50 years of development. However, some recently deglaciated soils feature rapid plant colonization and questions remain about the relative rate of change in the microbial community in the unvegetated soils of these chronosequences. Thus, we investigated the forelands of the Mendenhall Glacier near Juneau, AK, USA, where plants rapidly establish. We collected unvegetated samples representing soils that had been ice-free for 0, 1, 4, and 8 years. Total nitrogen (N) ranged from 0.00~0.14 mg/g soil, soil organic carbon pools ranged from 0.6~2.3 mg/g soil, and both decreased in concentration between the 0 and 4 yr soils. Biologically available phosphorus (P) and pH underwent similar dynamics. However, both pH and available P increased in the 8 yr soils. Nitrogen fixation was nearly undetectable in the most recently exposed soils, and increased in the 8 yr soils to ~5 ng N fixed/cm2/h, a trend that was matched by the activity of the soil N-cycling enzymes urease and β-1,4-N-acetyl-glucosaminidase. 16S rRNA gene clone libraries revealed no significant differences between the 0 and 8 yr soils; however, 8 yr soils featured the presence of cyanobacteria, a division wholly absent from the 0 yr soils. Taken together, our results suggest that microbes are consuming allochtonous organic matter sources in the most recently exposed soils. Once this carbon source is depleted, a competitive advantage may be ceded to microbes not reliant on in situ nutrient sources.

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Research Support, Non-U.S. Gov'ts

Ligand-Receptor Recognition for Activation of Quorum Sensing in Staphylococcus aureus: Li-Chun Chen , Li-Tse Tsou , Feng-Jui Chen; J. Microbiol. 2009;47(5):572-581. Published online October 24, 2009; DOI: https://doi.org/10.1007/s12275-009-0004-2

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Abstract PDF

The accessory gene regulator (agr) locus controls many of the virulence toxins involved in Staphylococcus aureus pathogenesis, and can be divided into four specificity groups. AgrC is the only group-specific receptor to mediate both intra-group activation and inter-group inhibition. We studied the ligand-receptor recognition of the agr system in depth by using a luciferase reporter system to identify the key residues responsible for AgrC activation in two closely related agr groups, AgrC-I, and AgrC-IV. Fusion PCR and site-directed mutagenesis were used to screen for functional residues of AgrC. Our data suggest that for AgrC-IV activation, residue 101 is critical for activating the receptor. In contrast, the key residues for the activation of AgrC-I are located at residues 49~59, 107, and 116. However, three residue changes, T101A, V107S, I116S, are sufficient to convert the AIP recognizing specificity from AgrC-IV to AgrC-I.

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Green Fluorescent Protein (GFP)-Based Overexpression Screening and Characterization of AgrC, a Receptor Protein of Quorum Sensing in Staphylococcus aureus
Lina Wang, Chunshan Quan, Baoquan Liu, Yongbin Xu, Pengchao Zhao, Wen Xiong, Shengdi Fan
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Genetic Diversity and Structure of Cordyceps sinensis Populations from Extensive Geographical Regions in China as Revealed by Inter-Simple Sequence Repeat Markers: Hong-Hui Liang , Zhou Cheng , Xiao-Ling Yang , Shan Li , Zu-Quan Ding , Tong-Shui Zhou , Wen-Ju Zhang , Jia-Kuan Chen; J. Microbiol. 2008;46(5):549-556. Published online October 31, 2008; DOI: https://doi.org/10.1007/s12275-008-0107-1

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Cordyceps sinensis is one of the most valuable medicinal caterpillar fungi native to China. However, its productivity is extremely limited and the species is becoming endangered. The genetic diversity of eighteen C. sinensis populations across its major distributing regions in China was evaluated by inter-simple sequence repeat (ISSR) markers. A total of 141 markers were produced in 180 individuals from the 18 populations, of which 99.3% were polymorphic. The low average of Shannon (0.104) and Nei index (0.07) of the 18 populations indicates that there are little genetic variations within populations. For all 18 populations, estimates of total gene diversity (HT), gene diversity within populations (HS), coefficient of genetic differentiation (GST), and gene flow (Nm) were 0.170, 0.071, 0.583, and 0.357, respectively. This pattern suggests that the genetic diversity of C. sinensis is low and most of the ISSR variations are found among populations with little gene exchange. The 18 populations are divided into five groups based on the genetic distance and the grouping pattern matches with the geographic distribution along the latitudinal gradient. The five groups show obvious difference in the GST and Nm values. Therefore, the genetic diversification of C. sinensis populations may be determined by geographic isolation and the combined effects of life history characters and the interaction with host insect species. The information illustrated by this study is useful for selecting in situ conservation sites of C. sinensis.

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Dominance of Endospore-forming Bacteria on a Rotating Activated Bacillus Contactor Biofilm for Advanced Wastewater Treatment: Seong Joo Park , Jerng Chang Yoon , Kwang-Soo Shin , Eung Ho Kim , Soobin Yim , Yeon-Je Cho , Gi Moon Sung , Dong-Geun Lee , Seung Bum Kim , Dong-Uk Lee , Sung-Hoon Woo , Ben Koopman; J. Microbiol. 2007;45(2):113-121.; DOI: https://doi.org/2525 [pii]

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Abstract PDF: The bacterial diversity inherent to the biofilm community structure of a modified rotating biological contactor wastewater treatment process, referred to as the Rotating Activated Bacillus Contactor (RABC) process, was characterized in this study, via both culture-dependent and culture-independent methods. On the basis of culture-dependent methods, Bacillus sp. were found to exist in large numbers on the biofilm (6.5% of the heterotrophic bacteria) and the microbial composition of the biofilms was quite simple. Only three phyla were identified-namely, the Proteobacteria, the Actinobacteria (High G+C Gram-positive bacteria), and the Firmicutes (Low G+C Gram-positive bacteria). The culture-independent partial 16S rDNA sequence analysis revealed a considerably more diverse microbial composition within the biofilms. A total of eight phyla were recovered in this case, three of which were major groups: the Firmicutes (43.9%), the Proteobacteria (28.6%), and the Bacteroidetes (17.6%). The remaining five phyla were minor groups: the Planctomycetes (4.4%), the Chlorobi (2.2%), the Actinobacteria (1.1%), the Nitrospirae (1.1%), and the Verrucomicrobia (1.1%). The two most abundant genera detected were the endospore-forming bacteria (31.8%), Clostridium and Bacillus, both of which are members of the Firmicutes phylum. This finding indicates that these endospore-forming bacteria successfully colonized and dominated the RABC process biofilms. Many of the colonies or clones recovered from the biofilms evidenced significantly high homology in the 16S rDNA sequences of bacteria stored in databases associated with advanced wastewater treatment capabilities, including nitrification and denitrification, phosphorus accumulation, the removal of volatile odors, and the removal of chlorohydrocarbons or heavy metals. The microbial community structures observed in the biofilms were found to correlate nicely with the enhanced performance of advanced wastewater treatment protocols.

Nucleotide Sequence and Secondary Structure of 5S rRNA from Sphingobium chungbukense DJ77: Hae-Ryong Kwon , Young-Chang Kim; J. Microbiol. 2007;45(1):79-82.; DOI: https://doi.org/2486 [pii]

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Abstract PDF: The 5S rRNA gene from Sphingobium chungbukense DJ77 was identified. The secondary structure of the 199-base-long RNA was proposed. The two-base-long D loop was the shortest among all of the known 5S rRNAs. The U19-U64 non-canonical pair in the helix II region was uniquely found in strain DJ77 among all of the sphingomonads.

The Influence of the Nucleotide Sequences of Random Shine-Dalgarno and Spacer Region on Bovine Growth Hormone Gene Expression: Soon-Young Paik , Kyung Soo Ra , Hoon Sik Cho , Kwang Bon Koo , Hyung Suk Baik , Myung Chul Lee , Jong Won Yun , Jang Won Choi; J. Microbiol. 2006;44(1):64-71.; DOI: https://doi.org/2335 [pii]

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Abstract PDF: To investigate the effects of the nucleotide sequences in Shine-Dalgarno (SD) and the spacer region (SD-ATG) on bovine growth hormone (bGH) gene expression, the expression vectors under the control of the T7 promoter (pT7-7 vector) were constructed using bGH derivatives (bGH1 & bGH14) which have different 5''-coding regions and were induced in E. coli BL21(DE3). Oligonucleotides containing random SD sequences and a spacer region were chemically synthesized and the distance between the SD region and the initiation codon were fixed to nine bases in length. The oligonucleotides were annealed and fused to the bGH1 and bGH14 cDNA, respectively. When the bGH gene was induced with IPTG in E. coli BL21(DE3), some clones containing only bGH14 cDNA produced considerable levels of bGH in the range of 6.9% to 8.5% of total cell proteins by SDS-PAGE and Western blot. Otherwise, the bGH was not detected in any clones with bGH1 cDNA. Accordingly, the nucleotide sequences of SD and the spacer region affect on bGH expression indicates that the sequences sufficiently destabilize the mRNA secondary structure of the bGH14 gene. When the free energy was calculated from the transcription initiation site to the +51 nucleotide of bGH cDNA using a program of nucleic acid folding and hybridization prediction, the constructs with values below ‒26.3 kcal/mole (toward minus direction) were not expressed. The constructs with the original sequence of bGH cDNA also did not show any expression, regardless of the free energy values. Thus, the disruption of the mRNA secondary structure may be a major factor regulating bGH expression in the translation initiation process. Accordingly, the first stem-loop among two secondary structures present in the 5''-end region of the bGH gene should be disrupted for the effective expression of bGH.

Review

Effects of Elevated Atmospheric CO_2 Concentrations on Soil Microorganisms: Chris Freeman , Seon-Young Kim , Seung-Hoon Lee , Hojeong Kang; J. Microbiol. 2004;42(4):267-277.; DOI: https://doi.org/2111 [pii]

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Abstract PDF: Effects of elevated CO_2 on soil microorganisms are known to be mediated by various interactions with plants, for which such effects are relatively poorly documented. In this review, we summarize and synthesize results from studies assessing impacts of elevated CO_2 on soil ecosystems, focusing primarily on plants and a variety the of microbial processes. The processes considered include changes in microbial biomass of C and N, microbial number, respiration rates, organic matter decomposition, soil enzyme activities, microbial community composition, and functional groups of bacteria mediating trace gas emission such as methane and nitrous oxide. Elevated CO_2 in atmosphere may enhance certain microbial processes such as CH_4 emission from wetlands due to enhanced carbon supply from plants. However, responses of extracellular enzyme activities and microbial community structure are still controversy, because interferences with other factors such as the types of plants, nutrient availabilitial in soil, soil types, analysis methods, and types of CO_2 fumigation systems are not fully understood.

Research Support, Non-U.S. Gov't

Monitoring of Bacterial Community in a Coniferous Forest Soil After a Wildfire: Ok-Sun Kim , Jae-Jun Yoo , Dong-Hun Lee , Tae-Seok Ahn , Hong-Gyu Song; J. Microbiol. 2004;42(4):278-284.; DOI: https://doi.org/2110 [pii]

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Abstract PDF: Changes in the soil bacterial community of a coniferous forest were analyzed to assess microbial responses to wildfire. Soil samples were collected from three different depths in lightly and severely burned areas, as well as a nearby unburned control area. Direct bacterial counts ranged from 3.3-22.6 x10^8 cells/(g . soil). In surface soil, direct bacterial counts of unburned soil exhibited a great degree of fluctuation. Those in lightly burned soil changed less, but no significant variation was observed in the severely burned soil. The fluctuations of direct bacterial count were less in the middle and deep soil layers. The structure of the bacterial community was analyzed via the fluorescent in situ hybridization method. The number of bacteria detected with the eubacteria-targeted probe out of the direct bacterial count varied from 30.3 to 84.7%, and these ratios were generally higher in the burned soils than in the unburned control soils. In the surface unburned soil, the ratios of [alpha]-, [beta]- and [gamma]-proteobacteria, Cytophaga-Flavobacterium group, and other eubacteria groups to total eubacteria were 9.9, 10.6, 15.5, 9.0, and 55.0%, respectively, and these ratios were relatively stable. The ratios of [alpha]-, [beta]- and [gamma]-proteobacteria, and Cytophaga-Flavobacterium group to total eubacteria increased immediately after the wildfire, and the other eubacterial proportions decreased in the surface and middle layer soils. By way of contrast, the composition of the 5 groups of eubacteria in the subsurface soil exhibited no significant fluctuations during the entire period. The total bacterial population and bacterial community structure disturbed by wildfire soon began to recover, and original levels seemed to be restored 3 months after the wildfire.

Retraction of Publication

Retraction Note to: Cryptic prophages in a blaNDM‑1‑bearing plasmid increase bacterial survival against high NaCl concentration, high and low temperatures, and oxidative and immunological stressors: So Yeon Kim , Kwan Soo Ko; J. Microbiol. 2023;61(4):481-481.; DOI: https://doi.org/10.1007/s12275-023-00049-1

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Abstract PDF: Retraction Note to: Journal of Microbiology (2020) Vol. 58, No. 6, pp. 483–488 https://doi.org/10.1007/s12275-020-9605-6 The Editor-in-Chief has retracted this article at the request of the authors. After publication concerns were raised that prophage sequences do not exist in the genome of the plasmid pNDM-A1 used in this study. The authors have not been able to confirm the existence of prophage sequences in the plasmid. As a result, the Editor-in-Chief no longer has confidence in the results and conclusions presented in this article. Kwan Soo Ko agrees with this retraction. So Yeon Kim has not responded to correspondence from the Editor-in-Chief about this retraction.

Research Support, Non-U.S. Gov't

Isolation and Taxonomic Characterization of a Novel Type I Methanotrophic Bacterium: Hee Gon Kim , Gui Hwan Han , Chi-Yong Eom , Si Wouk Kim; J. Microbiol. 2008;46(1):45-50.; DOI: https://doi.org/10.1007/s12275-008-0017-2

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A methane-oxidizing bacterium was isolated from the effluent of manure and its molecular and biochemical properties were characterized. The isolate was aerobic, Gram-negative, and non-motile. The organism had a type I intracytoplasmic membrane structure and granular inclusion bodies. The outer cell wall surface (S-layers) was tightly packed with cup-shaped structures. Colonies were light yellow on nitrate mineral salt agar medium. In addition, the organism was catalase and oxidase positive. The isolate used the ribulose monophosphate (RuMP) pathway for carbon assimilation, and was able to utilize methane and methanol as a sole carbon and energy source, however, it could not utilize any other organic compounds that were tested. The cells grew well in a mixture of methane and air (methane:air=1:1, v/v) in a compulsory circulation diffusion system, and when grown under those conditions, the optimum pH was approximately 7.0 and the optimal temperature was 30°C. In addition, the specific growth rate and generation time were 0.13 per h and 5.43 h, respectively, when grown under the optimum conditions. The major ubiquinone was Q-8, and the G+C mol% of the DNA was 55.3. Phylogenetic analyses based on the 16S rRNA gene sequence comparisons showed that this bacterium belongs to a group of type I methanotrophs, and that it is most closely related to Methylomicrobium, with a sequence similarity of 99%. Therefore, the isolate was named Methylomicrobium sp. HG-1.

Citations

Citations to this article as recorded by

Cultivation of Important Methanotrophs From Indian Rice Fields
Monali C. Rahalkar, Kumal Khatri, Pranitha Pandit, Rahul A. Bahulikar, Jyoti A. Mohite
Frontiers in Microbiology.2021;[Epub] CrossRef
Bacterial community shift and antibiotics resistant genes analysis in response to biodegradation of oxytetracycline in dual graphene modified bioelectrode microbial fuel cell
Junfeng Chen, Yuewei Yang, Yanyan Liu, Meizhen Tang, Renjun Wang, Yuping Tian, Chuanxing Jia
Bioresource Technology.2019; 276: 236. CrossRef
Methane oxidation in industrial biogas plants—Insights in a novel methanotrophic environment evidenced by pmoA gene analyses and stable isotope labelling studies
Tobias May, Daniela Polag, Frank Keppler, Markus Greule, Liane Müller, Helmut König
Journal of Biotechnology.2018; 270: 77. CrossRef
Influence of nutrients on oxidation of low level methane by mixed methanotrophic consortia
Obulisamy Parthiba Karthikeyan, Karthigeyan Chidambarampadmavathy, Saravanan Nadarajan, Kirsten Heimann
Environmental Science and Pollution Research.2016; 23(5): 4346. CrossRef
Review of Sustainable Methane Mitigation and Biopolymer Production
O. P. Karthikeyan, K. Chidambarampadmavathy, Samuel Cirés, Kirsten Heimann
Critical Reviews in Environmental Science and Technology.2015; 45(15): 1579. CrossRef
Optimization of lab scale methanol production by Methylosinus trichosporium OB3b
Hee Gon Kim, Gui Hwan Han, Si Wouk Kim
Biotechnology and Bioprocess Engineering.2010; 15(3): 476. CrossRef
Comparative evaluation of antioxidant, nitrite scavenging, and antitumor effects of Antrodia camphorata extract
Wol-Suk Cha, Ji-Lu Ding, DuBok Choi
Biotechnology and Bioprocess Engineering.2009; 14(2): 232. CrossRef

Nucleotide Sequence Analysis of the 5S Ribosomal RNA Gene of the Mushroom Tricholoma matsutake: Hwang, Seon Kap , Kim, Jong Guk; J. Microbiol. 1995;33(2):136-141.

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Abstract PDF: From a cluster of structural rRNA genes which has previsouly been cloned (Hwang and Kim, in submission; J. Microbiol. Biotechnol.), a 1.0-kb Eco RI fragment of DNA which shows significant homology to the 25S and rRNA s of Tricholoma matsutake was used for sequence analysis. Nucleotide sequence was bidirectionally determined using deletion series of the DNA fragment. Comparing the resultant 1016-base sequence with sequences in the database, both the 3'end of 25S-rRNA gene and 5S rRNA gene were searched. The 5S rRNA gene is 118-bp in length and is located 158-bp downstream of 3'end of the 25S rRNA gene. IGSI and IGS2 (partial) sequences are also contained in the fragment. Multiple alignment of the 5S rRNA sequences was carried out with 5S rRNA sequences from some members of the subdivision Basidiomycotina obtained from the database. Polygenetic analysis with distance matrix established by Kimura's 2-parameter method and phylogenetic tree by UPGMA method proposed that T. matsutake is closely related to efibulobasidium allbescens. Secondary structure of 5S rRNA was also hypothesized to show similar topology with its generally accepted eukaryotic counterpart.

Role of chromatin structure in HMRE mediated transcriptional repression of the HSP82 heat shock gene: Lee, See Woo , Gross, Davis S.; J. Microbiol. 1996;34(1):40-48.

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Abstract PDF: We have examined the chromatin structure of the HMRE/HSP82 and HMRa/HSP82 allels using three complementary approaches : DNase I chromating footprinting, micrococcal nuclease (MNase) nucleosome-protected ladder assay, and an in vivo E. coli dam methylase accessibility assay. The footprinting results indicate that the promoter and silencer sequences are assembled into nucleoprotein complexes which exhibit no detectable change in structure, despite a 70-fold range in expression levels. In addition, the promoter region of the HMRa/HSP82 allele is cleaved randomly by MNase in all cases, indicating the absence of anonical nucleosomes over this region irrespective of SIR4 or heat-shock. Finally, no discernible difference in the accessibility of the HMRE/HSP82 locus to dam methylase in SIR4 vs. sir4 cells was seen, which again suggests that the chromatin structure of HMRE/HSP82 allele is identical regardless of SIR4. Altogether, our results indicate that in contrast to other observations of the silent mating-type loci, no discernible structural alteration is detected at either HMR/HSP82 allele regardless of SIR genetic background or transcriptional state of the gene.

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