Ponticaulis profundi sp. nov. isolated from a deep-sea seamount.

A Gram-stain negative, rod-shaped, strictly aerobic, motile bacterial strain, designated YC239 ^T , was isolated from a seamount near the Yap Trench in the tropical western Pacific. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain YC239 ^T is related to the genus Ponticaulis and has high 16S rRNA gene sequence similarity with the type strain of Ponticaulis koreensis GSW-23 ^T (97.9%). The predominant cellular fatty acids were C _18:1 ω7c, C _16:0 , C _17:0 and C _17:1 ω6c. Strain YC239 ^T had Q-10 as the predominant ubiquinone. The polar lipid profile contained phosphatidylglycerol, two unidentified aminolipids and six unidentified polar lipids. The genomic DNA G+C content of strain YC239 ^T was 52.8 mol%. Strain YC239 ^T shared DNA relatedness of 38% with Ponticaulis koreensis KCTC 22146 ^T . On the basis of the evidence presented in this study, strain YC239 ^T represents a novel species of the genus Ponticaulis, for which we propose the name Ponticaulis profundi sp. nov. (type strain YC239 ^T  = KACC 19027 ^T  = CGMCC 1.15741 ^T ).