Muricauda beolgyonensis sp. nov., isolated from a tidal flat

Abstract

The taxonomic position of a Gram-staining-negative, non-motile, rod-shaped bacterium, strain BB-My12T, which was isolated from a sediment sample collected from a tidal flat in Korea, was investigated by using a polyphasic approach. Strain BB-My12T grew optimally at 37 °C, at pH 7.0–7.5 and in the presence of 2–3 % (w/v) NaCl. In phylogenetic analyses based on 16S rRNA gene sequences, strain BB-My12T fell within the cluster comprising species of the genus Muricauda and appeared most similar to the type strains of Muricauda aquimarina , Muricauda lutimaris and Muricauda ruestringensis (97.5–97.6 % sequence similarity). The DNA G+C content was 45.0 mol%. Strain BB-My12T contained MK-6 as the predominant menaquinone and iso-C15 : 1, iso-C17 : 0 3-OH and iso-C15 : 0 as the major cellular fatty acids. The polar lipids of strain BB-My12T were phosphatidylethanolamine and four unidentified lipids. The DNA–DNA relatedness values between strain BB-My12T and the type strains of the three species of the genus Muricauda that appeared most closely related were in the range 5–7 %. The genetic distinctiveness and some phenotypic properties indicated that strain BB-My12T did not belong to any established species of the genus Muricauda . Strain BB-My12T is therefore considered to represent a novel species of the genus Muricauda , for which the name Muricauda beolgyonensis sp. nov. is proposed. The type strain is BB-My12T ( = KCTC 23501T  = CCUG 60800T).