Rubritalea profundi sp nov., isolated from deep-seawater and emended description of the genus Rubritalea in the phylum Verrucomicrobia

초록

A Gram-stain-negative, short-rod, facultatively anaerobic, non-motile and red-pigmented bacterium, designated SAORIC165(T), was isolated from a deep-seawater sample collected from the Pacific Ocean. The 16S rRNA gene sequence analysis showed that strain SAORIC-165(T) was most closely related to Rubritalea marina Pol012(T) (95.7% sequence similarity) and formed a robust phylogenetic clade with other species of the genus Rubritalea in the phylum Verrucomicrobia. Optimal growth of strain SAORIC-165(T) was observed at 10 degrees C, pH 7.0 and in the presence of 2.0-3.5% (w/v) NaCl. The DNA G+C content of strain SAORIC-165(T) was 50.7 mol% and MK-9 was the predominant isoprenoid quinone. The major cellular fatty acids were summed feature 3 (C-16 : 1 omega 7c and/or C-16 : 1 omega 6c), iso-C-14 : 0, anteiso-C-15 : 0, C-16 : 0 and C-14 : 0. The major polar lipids constituted phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and unidentified phospholipids and aminolipids. On the basis of the taxonomic data obtained in this study, it was concluded that strain SAORIC-165(T) represented a novel species of the genus Rubritalea, for which the name Rubritalea profundi sp. nov. is proposed. The type strain of Rubritalea profundi is SAORIC-165(T) (= NBRC 110691(T) = KCTC 52460(T)).

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