JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Chryseobacterium gwangjuense sp. nov., isolated from soil.

A Gram-stain-negative, strictly aerobic, non-motile, rod-shaped bacterial strain, THG-A18(T), was isolated from soil of Gwangju province in South Korea. Strain THG-A18(T) grew optimally at 25-30 °C, at pH 7.0-8.0 and in the absence of NaCl. Strain THG-A18(T) displayed β-glucosidase activity, which enabled it to convert ginsenoside Rb1 to Rd. According to 16S rRNA gene sequence analysis, strain THG-A18(T) was shown to belong to the genus Chryseobacterium. The closest phylogenetic neighbours were Chryseobacterium ginsenosidimutans THG 15(T) (97.9 % 16S rRNA gene sequence similariity), C. defluvii B2(T) (97.7 %), C. daeguense K105(T) (97.6 %), C. taiwanense BCRC 17412(T) (97.5 %), C. indoltheticum LMG 4025(T) (97.4 %), C. gregarium P 461/12(T) (97.4 %) and C. lathyri RBA2-6(T) (97.3 %), but DNA-DNA relatedness values between these strains and strain THG-A18(T) were below 41.9 %. The G+C content of the genomic DNA was 36.4 mol%. The major respiratory quinone (MK-6) and fatty acids [iso-C15 : 0, iso-C17 : 0 3-OH, summed feature 3 (comprising C16 : 1ω7c and/or C16 : 1ω6c) and summed feature 9 (comprising iso-C17 : 1ω9c and/or 10-methyl C16 : 0)] supported the affiliation of strain THG-A18(T) with the genus Chryseobacterium. The polar lipids of strain THG-A18(T) were phosphatidylethanolamine, four unidentified aminolipids and seven unidentified lipids. A number of physiological and biochemical tests allowed phenotypic differentiation of strain THG-A18(T) from recognized species of the genus Chryseobacterium. The name Chryseobacterium gwangjuense sp. nov. is proposed, with THG-A18(T) ( = KACC 16227(T) = LMG 26579(T)) as the type strain.

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