Alteromonas oceanisediminis sp. nov., isolated from deep-sea sediment

A Gram-stain-negative, aerobic and rod-shaped bacterium, designated strain SM 2104^T, was isolated from a deep-sea sediment sample collected from the Southwest Indian Ocean. Strain SM 2104^T grew at 10-37 °C (optimum at 25 °C), and with 1.0-9.0% (w/v, optimum with 2-4%) NaCl. It hydrolyzed starch, tween 80 and gelatin but did not reduced nitrate to nitrite. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain SM 2104^T was affiliated with the genus Alteromonas, sharing the highest 16S rRNA gene sequence similarities with type strains of Alteromonas flava (97.5%) and Alteromonas facilis (97.4%) and forming a distinct clade together with the two Alteromonas species. The digital DNA-DNA hybridization and average nucleotide identity values between strain SM 2104 ^T and type strains of Alteromonas flava and Alteromonas facilis were below 14.5%, and 71.0%, respectively. The major fatty acids of strain SM 2104^T were summed feature 3 (C_16:1ω6c/C_16:1ω7c), C_16:0 and summed feature 8 (C_18:1ω7c/C_18:1ω6c). The major polar lipids of strain SM 2104^T were phosphatidylethanolamine and phosphatidylglycerol and the only respiratory quinone of strain SM 2104^T was ubiquinone-8. The genomic DNA G + C content of strain SM 2104^T was 48.0%. On the basis of the phylogenetic, phenotypic, chemotaxonomic and genomic analyses presented in this study, strain SM 2104^T is considered to represent a novel species within the genus Alteromonas, for which the name Alteromonas oceansediminis sp. nov. is proposed. The type strain is SM 2104^T (= CCTCC AB 2021121^T = KCTC 82867^T).