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Shewanella affinis sp. nov., isolated from marine invertebrates

¹ Industrial Research Institute, Swinburne University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia
² Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Pr. 100 Let Vladivostoku 159, Russia
³ Laboratory of Microbiology, Graduate School of Fisheries Sciences, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041-8611, Japan
⁴ Institute of Marine Biology of the Far-Eastern Branch of the Russian Academy of Sciences, Palchevskogo Str. 17, 690041 Vladivostok, Russia
⁵ School of Agricultural Science, University of Tasmania, Private Bag 54, Hobart 7001, Tasmania, Australia

Correspondence
Elena P. Ivanova
eivanova{at}swin.edu.au

Four marine bacterial strains, designated KMM 3587^T, KMM 3586, KMM 3821 and KMM 3822, were isolated from the sipuncula Phascolosoma japonicum, a common inhabitant of Troitza Bay in the Gulf of Peter the Great (Sea of Japan region), and from an unidentified hydrocoral species collected in Makarov Bay (Iturup Islands), Kuril Islands, North-West Pacific Ocean. The strains were characterized to clarify their taxonomic position. 16S rRNA gene sequences of KMM 3587^T and KMM 3586 indicated 99 % similarity to Shewanella colwelliana. Despite such a high level of 16S rRNA gene sequence similarity, DNA–DNA hybridization experiments demonstrated only 45–52 % binding with DNA of S. colwelliana ATCC 39565^T. The DNA G+C contents of the novel strains were 45 mol% and the shared level of DNA hybridization was conspecific (81–97 %), indicating that they represent a single genospecies. The novel strains were mesophilic (able to grow at 10–34 °C), neutrophilic and haemolytic, and able to degrade gelatin, casein and Tween 20, 40 and 80, but not starch, agar, elastin, alginate or chitin. The major fatty acids were i13 : 0, i15 : 0, 16 : 0, 16 : 17 and 17 : 18 (68·9 % of total). The major isoprenoid quinones were Q7 (47–62 %) and Q8 (26–47 %). Eicosapentaenoic acid was produced in minor amounts. Based on these data, the strains are assigned to a novel species, Shewanella affinis sp. nov. (type strain KMM 3587^T=CIP 107703^T=ATCC BAA-642^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains KMM 3587^T and KMM 3586 are AY351983 and AF500080, respectively.

Tables showing the cellular fatty acid composition and isoprenoid quinone composition of Shewanella affinis are available in IJSEM Online.

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