Aestuariibaculum suncheonense gen. nov., sp. nov., a marine bacterium of the family Flavobacteriaceae isolated from a tidal flat and emended descriptions of the genera Gaetbulibacter and Tamlana

Sang Hyeon Jeong, Moon Su Park, Hyun Mi Jin, Kangseok Lee, Woojun Park, Che Ok Jeon
International Journal of Systematic and Evolutionary Microbiology 2013, 63 (Pt 1): 332-8
A Gram-staining-negative, yellow-pigmented, strictly aerobic bacterium, designated strain SC17(T), was isolated from sediment of a tidal flat of Suncheon bay in South Korea. Cells were halotolerant, catalase- and oxidase-positive and non-motile rods. Growth of strain SC17(T) was observed at 5-40 °C (optimum, 25-30 °C), at pH 6.0-8.5 (optimum, pH 7.0) and in the presence of 1-8 % (w/v) NaCl (optimum, 1-2 %). The major cellular fatty acids were iso-C(15 : 0), summed feature 3 (comprising C(16 : 1)ω7c and/or C(16 : 1)ω6c and/or iso-C(15 : 0) 2-OH), iso-C(17 : 0) 3-OH, iso-C(15 : 1) G and anteiso-C(15 : 0.) The polar lipid content consisted of phosphatidylethanolamine and unidentified amino lipids and lipids. The G+C content of the genomic DNA was 46.4 mol% and the only respiratory quinone detected was menaquinone-6 (MK-6). Phylogenetic inference based on 16S rRNA gene sequences showed that strain SC17(T) formed a distinct phyletic lineage within the family Flavobacteriaceae and was most closely related to members of the genera Gaetbulibacter and Tamlana with 95.0-95.8 % sequence similarity. On the basis of phenotypic and molecular features, strain SC17(T) represents a novel genus of the family Flavobacteriaceae, for which the name Aestuariibaculum suncheonense gen. nov., sp. nov. is proposed. The type strain is SC17(T) (= KACC 16186(T) = JCM 17789(T)). Emended descriptions of the genera Gaetbulibacter and Tamlana are also proposed.

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