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

A Gram-stain negative, rod-shaped, strictly aerobic, motile bacterial strain, designated YC239, 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 is related to the genus Ponticaulis and has high 16S rRNA gene sequence similarity with the type strain of Ponticaulis koreensis GSW-23 (97.9%). The predominant cellular fatty acids were Cω7c, C, C and Cω6c. Strain YC239 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 was 52.8 mol%. Strain YC239 shared DNA relatedness of 38% with Ponticaulis koreensis KCTC 22146. On the basis of the evidence presented in this study, strain YC239 represents a novel species of the genus Ponticaulis, for which we propose the name Ponticaulis profundi sp. nov. (type strain YC239 = KACC 19027 = CGMCC 1.15741).