sp. nov., isolated from deep sea sediment of the Mariana Trench.

A Gram-stain-negative, light pink-coloured, rod-shaped, flagellated and facultative anaerobic bacterial strain, designated MT2928, was isolated from deep-sea sediment collected from the Mariana Trench. Growth of strain MT2928 occurred optimally at 28 °C, pH 8.0-9.0 and in the presence of 1.0-2.0 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain MT2928 belongs to the genus and has the highest sequence similarity to GYSW-23 (96.6 %). Genomic analysis indicated that strain MT2928 contains a circular chromosome of 4 199 362 bp with G+C content of 67.2 mol%. The strain did not produce bacteriochlorophyll a, but produced carotenoid. The predominant respiratory quinone of MT2928 was ubiquinone-10. The polar lipids of MT2928 contained diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, two unidentified lipids and two unidentified phospholipids. The major fatty acids of strain MT2928 contained summed feature 8 (C 7 or/and C 6), C and summed feature 2 (iso-C I and/or C 3-OH). On the basis of phylogenetic, physiological, biochemical and other phenotypic properties, strain MT2928 represents a novel species of the genus , and the name sp. nov. is proposed with the type species MT2928 (=MCCC 1K05575=JCM 34320).