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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.

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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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Bacterial, Archaeal, and Eukaryal Diversity in the Intestines of Korean People: Young-Do Nam , Ho-Won Chang , Kyoung-Ho Kim , Seong Woon Roh , Min-Soo Kim , Mi-Ja Jung , Si-Woo Lee , Jong-Yeol Kim , Jung-Hoon Yoon , Jin-Woo Bae; J. Microbiol. 2008;46(5):491-501. Published online October 31, 2008; DOI: https://doi.org/10.1007/s12275-008-0199-7

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Abstract PDF

The bacterial, archaeal, and eukaryal diversity in fecal samples from ten Koreans were analyzed and compared by using the PCR-fingerprinting method, denaturing gradient gel electrophoresis (DGGE). The bacteria all belonged to the Firmicutes and Bacteroidetes phyla, which were known to be the dominant bacterial species in the human intestine. Most of the archaeal sequences belonged to the methane-producing archaea but several halophilic archarea-related sequences were also detected unexpectedly. While a small number of eukaryal sequences were also detected upon DGGE analysis, these sequences were related to fungi and stramenopiles (Blastocystis hominis). With regard to the bacterial and archaeal DGGE analysis, all ten samples had one and two prominent bands, respectively, but many individual-specific bands were also observed. However, only five of the ten samples had small eukaryal DGGE bands and none of these bands was observed in all five samples. Unweighted pair group method and arithmetic averages clustering algorithm (UPGMA) clustering analysis revealed that the archaeal and bacterial communities in the ten samples had relatively higher relatedness (the average Dice coefficient values were 68.9 and 59.2% for archaea and bacteria, respectively) but the eukaryal community showed low relatedness (39.6%).

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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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