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Photobacterium lipolyticum sp. nov., a bacterium with lipolytic activity isolated from the Yellow Sea in Korea

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
² Biotechnology Research Centre, National Fisheries Research and Development Institute, Gijang-gun, Busan, Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

A Gram-negative, motile, non-spore-forming, pleomorphic and lipolytic bacterial strain, M37^T, was isolated from an intertidal sediment of the Yellow Sea in Korea. This organism grew optimally at 25–28 °C and in the presence of 1–2 % NaCl. It did not grow without NaCl or in the presence of more than 6 % NaCl. Strain M37^T was characterized chemotaxonomically by having Q-8 as the predominant respiratory lipoquinone and C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH and C_{16 : 0} as the major fatty acids. The DNA G+C content was 47 mol%. Phylogenetic analyses based on 16S rRNA gene sequences placed strain M37^T within the clade comprising Photobacterium species, forming a coherent cluster with the type strains of Photobacterium profundum and Photobacterium indicum (16S rRNA gene similarity levels of 97·5–98·0 %). The mean DNA–DNA relatedness levels between strain M37^T and P. profundum JCM 10084^T and P. indicum DSM 5151^T were in the range 12–15 %. Similarities between 16S rRNA gene sequences of strain M37^T and those of the type strains of the other Photobacterium species ranged from 93·9 % (with Photobacterium fischeri) to 96·2 % (with Photobacterium phosphoreum). On the basis of phenotypic properties and phylogenetic and genomic distinctiveness, strain M37^T (=KCTC 10562BP^T=DSM 16190^T) should be placed in the genus Photobacterium as a novel species, for which the name Photobacterium lipolyticum sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain M37^T is AY554009.

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