Journal of Microbiology

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Lactiplantibacillus koreensis sp. nov. and Lactiplantibacillus kimchii sp. nov., isolated from kimchi, a traditional Korean fermented food: Min Ji Lee, Jisu Lee, Sohee Nam, Mi-Ja Jung, Yeon Bee Kim, Yujin Kim, Jeong Ui Yun, Seong Woon Roh, Tae Woong Whon, Che Ok Jeon, Se Hee Lee; J. Microbiol. 2025;63(11):e2507007. Published online November 30, 2025; DOI: https://doi.org/10.71150/jm.2507007

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Abstract PDF Supplementary Material: Two Gram-stain-positive, facultatively anaerobic, rod-shaped, and non-motile lactic acid bacterial strains, designated as strains CBA3605^T and CBA3606^T, were isolated from kimchi, a traditional Korean fermented food. Both strains were oxidase- and catalase-negative, non-spore-forming, non-hemolytic, and non-gas-producing. Optimal growth conditions for the two strains were observed at 30°C, pH 5.0, and 0% NaCl. The two genomes were composed of a circular chromosome and three plasmids and the DNA G + C content of 43.0%, respectively. Strains CBA3605^T and CBA3606^T were most closely related to Lactiplantibacillus (Lp.) pingfangensis 382-1^T with 16S rRNA sequence similarity of 99.4% and 99.1%, respectively. However, the orthologous average nucleotide identities between CBA3605^T and CBA3606^T were 91.7%, and those with strain 382-1^T were 76.9% and 76.5%, respectively. Digital DNA–DNA hybridization values between CBA3605^T and CBA3606^T were 45.0%, and those with strain 382-1^T were 21.4% and 21.0%, respectively. The major fatty acids detected in both strains included C_16:0, C_18:1 ω9c, and summed features 7 (C_19:1 ω7c, C_19:1 ω6c, C_19:0 cyclo ω10c, and/or C_19:0 ω6c). The peptidoglycan of both strains CBA3605^T and CBA3606^T contained meso-diaminopimelic acid and was classified as A4α type (L-Lys–D-Asp). In polar lipid analyses, only strain CBA3605^T contained aminophosphoglycolipid, which was absent in CBA3606^T, although both strains harbored same major polar lipids (diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine). Based on phenotypic, phylogenetic, genomic, biochemical, and chemotaxonomic analyses, strains CBA3605^T and CBA3606^T represent two novel species of the genus Lactiplantibacillus, for which the names Lactiplantibacillus koreensis sp. nov. and Lactiplantibacillus kimchii sp. nov. are proposed, with CBA3605^T (= KACC 81073BP^T = JCM 37965^T), and CBA3606^T (= KACC 81074BP^T = JCM 37966^T) as the type strains.

Journal Articles

Sala cibi gen. nov., sp. nov., an extremely halophilic archaeon isolated from solar salt: Hye Seon Song , Juseok Kim , Yeon Bee Kim , Se Hee Lee , Tae Woong Whon , Seong Woon Roh; J. Microbiol. 2022;60(9):899-904. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2137-5

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Two novel halophilic archaeal strains, CBA1133T and CBA- 1134, were isolated from solar salt in South Korea. The 16S rRNA gene sequences of the isolates were identical to each other and were closely related to the genera Natronomonas (92.3–93.5%), Salinirubellus (92.2%), Halomarina (91.3– 92.0%), and Haloglomus (91.4%). The isolated strains were coccoid, Gram-stain-negative, aerobic, oxidase-positive, and catalase-negative. Growth occurred under temperatures of 25–50°C (optimum, 45°C), NaCl levels of 10–30% (optimum, 15%), pH levels of 6.0–8.5 (optimum, 7.0), and MgCl2 concentrations of 0–500 mM (optimum, 100 mM). Digital DNADNA hybridization values between the strains and related genera ranged from 18.3% to 22.7%. The major polar lipids of the strains were phosphatidyl glycerol, phosphatidyl glycerol phosphate methyl ester, and phosphatidyl glycerol sulfate. Genomic, phenotypic, physiological, and biochemical analyses of the isolates revealed that they represent a novel genus and species in the family Halobacteriaceae. The type strain is CBA1133T (= KACC 22148T = JCM 34265T), for which the name Sala cibi gen. nov., sp. nov. is proposed.

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Dominance and diversity of archaea in food-grade salts: insights for histamine degradation in salt-fermented foods
Jing Hou, Ya-Ling Mao, Na Li, Xiao-Yan Yang, Chidiebele Nwankwo, Heng-Lin Cui
International Journal of Food Science and Technology.2024; 59(12): 9490. CrossRef
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Ya-Ping Sun, Bei-Bei Wang, Zhang-Ping Wu, Xi-Wen Zheng, Jing Hou, Heng-Lin Cui
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Brachybacterium kimchii sp. nov. and Brachybacterium halotolerans subsp. kimchii subsp. nov., isolated from the Korean fermented vegetables, kimchi, and description of Brachybacterium halotolerans subsp. halotolerans subsp. nov.: Yujin Kim , Yeon Bee Kim , Juseok Kim , Joon Yong Kim , Tae Woong Whon , Won-Hyong Chung , Eun-Ji Song , Young-Do Nam , Se Hee Lee , Seong Woon Roh; J. Microbiol. 2022;60(7):678-688. Published online July 4, 2022; DOI: https://doi.org/10.1007/s12275-022-1581-6

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Abstract PDF

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

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Metagenomic Insights into the Taxonomic and Functional Features of Traditional Fermented Milk Products from Russia
Alexander G. Elcheninov, Kseniya S. Zayulina, Alexandra A. Klyukina, Mariia K. Kremneva, Ilya V. Kublanov, Tatiana V. Kochetkova
Microorganisms.2023; 12(1): 16. CrossRef
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Aharon Oren, George M. Garrity
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
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Review

Omics in gut microbiome analysis: Tae Woong Whon , Na-Ri Shin , Joon Yong Kim , Seong Woon Roh; J. Microbiol. 2021;59(3):292-297. Published online February 23, 2021; DOI: https://doi.org/10.1007/s12275-021-1004-0

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Our understanding of the interactions between microbial communities and their niche in the host gut has improved owing to recent advances in environmental microbial genomics. Integration of metagenomic and metataxonomic sequencing data with other omics data to study the gut microbiome has become increasingly common, but downstream analysis after data integration and interpretation of complex omics data remain challenging. Here, we review studies that have explored the gut microbiome signature using omics approaches, including metagenomics, metataxonomics, metatranscriptomics, and metabolomics. We further discuss recent analytics programs to analyze and integrate multi-omics datasets and further utilization of omics data with other advanced techniques, such as adaptive immune receptor repertoire sequencing, microbial culturomics, and machine learning, to evaluate important microbiome characteristics in the gut.

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

Rhodopirellula rosea sp. nov., a Novel Bacterium Isolated from an Ark Clam Scapharca broughtonii: Seong Woon Roh , Hae-Won Lee , Kyung June Yim , Na-Ri Shin , Jina Lee , Tae Woong Whon , Na-Lae Lim , Daekyung Kim , Jin-Woo Bae; J. Microbiol. 2013;51(3):301-304. Published online June 28, 2013; DOI: https://doi.org/10.1007/s12275-013-3210-x

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Abstract PDF: A novel Gram-negative, motile, and ovoid-shaped strain, LHWP3T, which belonged to the family Planctomycetaceae in the phylum Planctomycetes, was isolated from a dead ark clam Scapharca broughtonii collected during a mass mortality event on the south coast of Korea. Phylogenetic analysis based on the 16S rRNA gene sequences indicated that the isolate was most closely related to the type strain of Rhodopirellula baltica, with a shared 16S rRNA gene sequence similarity of 94.8%. The isolate grew optimally at 30°C in 4–6% (w/v) NaCl, and at pH 7. The major isoprenoid quinone was menaquinone-6 (MK-6). The dominant polar lipids were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, and unidentified polar lipids. The predominant cellular fatty acids were C16:0, C18:1 ω9c, and C18:0. The genomic DNA G+C content of strain LHWP3T was 53.0 mol%. Based on polyphasic taxonomic analyses, strain LHWP3T should be classified as a novel species in the genus Rhodopirellula in the family Planctomycetaceae, for which the name Rhodopirellula rosea sp. nov. is proposed. The type strain is LHWP3T (=KACC 15560T =JCM 17759T).

Paenibacillus marinisediminis sp. nov., a Bacterium Isolated from Marine Sediment: Hae-Won Lee , Seong Woon Roh , Kyung June Yim , Na-Ri Shin , Jina Lee , Tae Woong Whon , Joon Yong Kim , Dong-Wook Hyun , Daekyung Kim , Jin-Woo Bae; J. Microbiol. 2013;51(3):312-317. Published online June 28, 2013; DOI: https://doi.org/10.1007/s12275-013-3198-2

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Abstract PDF: A Gram-negative, nonmotile, endospore-forming, rod-shaped bacterial strain LHW35T, which belonged to the genus Paenibacillus, was isolated from marine sediment collected from the south coast of the Republic of Korea. A phylogenetic analysis of 16S rRNA gene sequences indicated that strain LHW35T was most closely related to Paenibacillus taiwanensis G-soil-2-3T (97.2% similarity). The optimal growth conditions for strain LHW35T were 37°C, pH 6.0, and 0% (w/v) NaCl. The main isoprenoid quinone was menaquinone-7 (MK-7) and the major polyamine was spermidine. The diamino acid present in the cell-wall peptidoglycan was meso-diaminopimelic acid. The major fatty acids were anteiso-C15:0 and C16:0. The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, unidentified aminohospholipids, unidentified phospholipids, and unidentified polar lipids. A DNA-DNA hybridization experiment using the type strain of P. taiwanensis indicated <40% relatedness. The DNA G+C content was 45.0 mol%. Based on these phylogenetic, genomic, and phenotypic analyses, strain LHW35T should be classified as a novel species within the genus Paenibacillus, for which the name Paenibacillus marinisediminis sp. nov. is proposed. The type strain is LHW35T (=KACC 16317T =JCM 17886T).

NOTE] Oceanobacillus kimchii sp. nov. Isolated from a Traditional Korean Fermented Food: Tae Woong Whon , Mi-Ja Jung , Seong Woon Roh , Young-Do Nam , Eun-Jin Park , Kee-Sun Shin , Jin-Woo Bae; J. Microbiol. 2010;48(6):862-866. Published online January 9, 2011; DOI: https://doi.org/10.1007/s12275-010-0214-7

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A moderate halophile, strain X50T, was isolated from mustard kimchi, a traditional Korean fermented food. The organism grew under conditions ranging from 0-15.0% (w/v) NaCl (optimum: 3.0%), pH 7.0-10.0 (optimum: pH 9.0) and 15-45°C (optimum: 37°C). The morphological, physiological, and biochemical features and the 16S rRNA gene sequences of strain X50T were characterized. Colonies of the isolate were creamcolored and the cells were rod-shaped. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain X50T belongs to the genus Oceanobacillus and is closely related phylogenetically to the type strain O. iheyensis HTE831T (98.9%) and O. oncorhynchi subsp. oncorhynchi R-2T (97.0%). The cellular fatty acid profiles predominately included anteiso-C15:0 and iso-C15:0. The G+C content of the genomic DNA of the isolate was 37.9 mol% and the major isoprenoid quinone was MK-7. Analysis of the 16S rRNA gene sequences, DNA-DNA relatedness and physiological and biochemical tests indicated genotypic and phenotypic differences among strain X50T and reference species in the genus Oceanobacillus. Therefore, strain X50T was proposed as a novel species and named Oceanobacillus kimchii. The type strain of the new species is X50T (=JCM 16803T =KACC 14914T =DSM 23341T).

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Pathogenomics of Streptococcus ilei sp. nov., a newly identified pathogen ubiquitous in human microbiome: Dong-Wook Hyun , Jae-Yun Lee , Min-Soo Kim , Na-Ri Shin , Tae Woong Whon , Kyung Hyun Kim , Pil Soo Kim , Euon Jung Tak , Mi-Ja Jung , June Young Lee , Hyun Sik Kim , Woorim Kang , Hojun Sung , Che Ok Jeon , Jin-Woo Bae; J. Microbiol. 2021;59(8):793-806.; DOI: https://doi.org/10.1007/s12275-021-1165-x

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Viridans group streptococci are a serious health concern because most of these bacteria cause life-threatening infections, especially in immunocompromised and hospitalized individuals. We focused on two alpha-hemolytic Streptococcus strains (I-G2 and I-P16) newly isolated from an ileostomy effluent of a colorectal cancer patient. We examined their pathogenic potential by investigating their prevalence in human and assessing their pathogenicity in a mouse model. We also predicted their virulence factors and pathogenic features by using comparative genomic analysis and in vitro tests. Using polyphasic and systematic approaches, we identified the isolates as belonging to a novel Streptococcus species and designated it as Streptococcus ilei. Metagenomic survey based on taxonomic assignment of datasets from the Human Microbiome Project revealed that S. ilei is present in most human population and at various body sites but is especially abundant in the oral cavity. Intraperitoneal injection of S. ilei was lethal to otherwise healthy C57BL/6J mice. Pathogenomics and in vitro assays revealed that S. ilei possesses a unique set of virulence factors. In agreement with the in vivo and in vitro data, which indicated that S. ilei strain I-G2 is more pathogenic than strain I-P16, only the former displayed the streptococcal group A antigen. We here newly identified S. ilei sp. nov., and described its prevalence in human, virulence factors, and pathogenicity. This will help to prevent S. ilei strain misidentification in the future, and improve the understanding and management of streptococcal infections.

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