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Photobacterium frigidiphilum sp. nov., a psychrophilic, lipolytic bacterium isolated from deep-sea sediments of Edison Seamount

Marine Biotechnology Research Centre, Korea Ocean Research and Development Institute, PO Box 29, Ansan 425-600, Republic of Korea

Correspondence
Sang-Jin Kim
s-jkim{at}kordi.re.kr

A Gram-negative, motile, rod-shaped, psychrophilic and weakly halophilic bacterial strain, SL13^T, was isolated from deep-sea sediments (1450 m depth) of Edison Seamount in the western Pacific Ocean. Optimal growth of SL13^T requires the presence of 1·5 % (w/v) NaCl, a pH of 6·0 and a temperature of 14 °C. The whole-cell fatty acid profile of the isolate includes C16 : 1 and C16 : 0 as major fatty acids and contains C20 : 53. This is consistent with corresponding data for Photobacterium profundum. The DNA G+C content of strain SL13^T is 43·8 mol%. Phylogenetic analyses of 16S rRNA gene sequences place this bacterium in the ‘Gammaproteobacteria’, within the genus Photobacterium. Sequence similarity analysis indicates that the closest relatives of strain SL13^T are Photobacterium indicum (99·3 %), P. profundum (98·5 %) and Photobacterium lipolyticum (98·2 %). The DNA–DNA hybridization levels between the isolate and its closest known phylogenetic relatives, P. indicum, P. profundum and P. lipolyticum, are 27·1, 52·4 and 20·2 %, respectively. Thus strain SL13^T represents a novel species of the genus Photobacterium, for which the name Photobacterium frigidiphilum sp. nov. is proposed. The type strain is SL13^T (=KCTC 12384^T=JCM 12947^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain SL13^T is AY538749.

A table of physiological properties of strain SL13^T and a graph showing growth of the strain under varying barometric pressure are available as supplementary material in IJSEM Online.

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