Lactobacillus kosoi sp. nov., a fructophilic species isolated from kôso, a Japanese sugar-vegetable fermented beverage

Tai Ying Chiou*, Wataru Suda, Kenshiro Oshima, Masahira Hattori, Chiaki Matsuzaki, Kenji Yamamoto, Tomoya Takahashi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)


    A novel Gram-positive, fructophilic, catalase negative, and rod-shaped strain, designated strain 10HT was isolated from kôso, a Japanese sugar-vegetable fermented beverage obtained from a food processing factory in Saku City, Nagano Prefecture, Japan. Phylogenetic analysis based on 16S rRNA gene sequences revealed strain 10HT to belong to the genus Lactobacillus, with closely related type strains being Lactobacillus kunkeei YH-15T (95.5% sequence similarity), Lactobacillus ozensis Mizu2-1T (95.4% sequence similarity), and Lactobacillus apinorum Fhon13NT (95.3% sequence similarity). The isolate was found to grow at 18–39 °C (optimum 27 °C), pH 4.0–7.0 (optimum pH 6.5) and in the presence of 0–2% NaCl (optimum 0% NaCl). The G + C content of its genomic DNA was determined to be 30.5 mol%. The major fatty acid (≥ 10%) components identified included C16:0, C19:0 cyclo ω7c, C19:0 cyclo ω9c, and C18:1 ω9c. The polar lipids were identified as lysophosphatidylethanolamine, phosphatidylethanolamine and glycolipids. The predominant isoprenoid quinones (> 10%) were identified as MK-7, MK-8, MK-9 and MK-10. The amino acid composition of the cell wall was detected as comprising Asp, Glu, Ala, and Lys but the strain lacks meso-diaminopimelic acid. As with other fructophilic lactic acid bacteria, such as L. kunkeei and L. apinorum, strain 10HT was found to prefer d-fructose to d-glucose as a growth substrate. On the basis of these genetic and phenotypic results, the isolate is concluded to represent a novel species, for which the name Lactobacillus kosoi is proposed. The type strain is 10HT (= NBRC 113063T = BCRC 81100T).

    Original languageEnglish
    Pages (from-to)1149-1156
    Number of pages8
    JournalAntonie van Leeuwenhoek, International Journal of General and Molecular Microbiology
    Issue number7
    Publication statusPublished - 2018 Jul 1


    • 16S rRNA gene
    • Fructophilic lactic acid bacteria
    • Kôso
    • Lactobacillus kosoi sp. nov
    • Plyphasic taxonomy

    ASJC Scopus subject areas

    • Microbiology
    • Molecular Biology


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