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

A Gram-stain-negative, aerobic, rod-shaped, non-flagellated, non-gliding bacterial strain, designated MT50 T , was isolated from a deep-sea sediment sample collected from the Mariana Trench. Optimal growth of strain MT50 T was observed at 25 °C, pH 7.0–7.5 and in the presence of 3–5 % (w/v) NaCl. The strain was positive for oxidase and catalase. Phylogenetic analysis of 16S rRNA gene sequences revealed that strain MT50 T is affiliated with the genus Mesonia , showing the highest sequence similarity (98.5 %) to the type strain of Mesonia ostreae . The digital DNA–DNA hybridization and average nucleotide identity values between strain MT50 T and four closely related type strains of known Mesonia species (14.1–54.8 % and 72.7–86.8 %, respectively) were all below the threshold values to discriminate bacterial species, indicating that strain MT50 T is affiliated with a novel species within the genus. The genomic G+C content deduced from the genome of strain MT50 T was 36.2 mol%. The major fatty acids of strain MT50 T were iso-C 15 : 0 , iso-C 17 : 0 3-OH and anteiso-C 15 : 0 . The predominant respiratory quinone of the strain was MK-6. The polar lipids of strain MT50 T included phosphatidylethanolamine and two unidentified lipids. Based on the polyphasic data presented in this study, strain MT50 T represents a novel species of the genus Mesonia , for which the name Mesonia profundi sp. nov. is proposed. The type strain is MT50 T (=MCCC 1K07833 T =KCTC 92380 T ).