Abyssibacter profundi gen. nov., sp nov., a marine bacterium isolated from seawater of the Mariana Trench

A Gram-stain-negative, strictly aerobic, short-rod-shaped bacterium, motile by a single polar flagellum, designated OUC007(T), was isolated from seawater at a depth of 1000 m in the Mariana Trench. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain OUC007(T) formed a lineage within the family Salinisphaeraceae that was distinct from the most closely related genera Oceanococcus and Salinisphaera, with 16S rRNA gene sequences similarities ranging from 89.3 to 90.8 %, respectively. Strain OUC007(T) grew with 0-7% (w/v) NaCl (optimum, 2-3 %), at 10-45 degrees C (37 degrees C) and at pH 7.0-9.0 (7.08.0). The major respiratory quinone was ubiquinone-8 (Q-8). The polar lipids of strain OUC007(T) comprised one phosphatidylethanolamine and three unidentified polar lipids. The predominant fatty acid (more than 10% of total fatty acids) was summed feature 8 (C-18:1 omega 7c or/and C-18:1 omega 6c). The DNA G+C content of strain OUC007(T) was 63.1 mol%. On the basis of polyphasic taxonomic analysis, the strain OUC007(T) is considered to represent a novel species in a new genus of the family Salinisphaeraceae, for which the name Abyssibacter profundi gen. nov., sp. nov. is proposed. The type strain is OUC007(T) (= CTC 52933(T) = MCCC 1K03450(T)).