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Photobacterium aplysiae sp. nov., a lipolytic marine bacterium isolated from eggs of the sea hare Aplysia kurodai

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

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

A bacterium, named GMD509^T, showing lipolytic activity was isolated from the eggs of the sea hare Aplysia kurodai collected at Mogiyeo (depth, 12 m), an uninhabited small island in the South Sea of Korea. The strain is Gram-negative, motile, facultatively anaerobic, mesophilic and weakly halophilic. Optimal growth of strain GMD509^T occurs in the presence of 3·0 % (w/v) NaCl and at pH 8 and 25 °C. The whole-cell fatty acid profile of the isolate includes C16 : 1, C16 : 0 and C18 : 1 as major fatty acids and its DNA G+C content is 45 mol%. Phylogenetic analyses of 16S rRNA gene sequences place this bacterium in the -Proteobacteria, within the genus Photobacterium. The 16S rRNA gene sequence of strain GMD509^T is most similar to those of Photobacterium frigidiphilum (97·8 %), Photobacterium profundum (97·5 %) and Photobacterium indicum (97·4 %). DNA–DNA relatedness levels between the isolate and its closest known phylogenetic relatives, P. frigidiphilum and P. indicum, are 25·3 and 13·7 %, respectively. Strain GMD509^T therefore represents a novel species, for which the name Photobacterium aplysiae sp. nov. is proposed, with the type strain GMD509^T (=KCTC 12383^T=JCM 12948^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain GMD509^T is AY781193.

A transmission electron micrograph of a negatively stained cell of strain GMD509^T is available as supplementary material in IJSEM Online.

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