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1 Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Pr. 100 Let Vladivostoku 159, Russia
2 Industrial Research Institute, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
3 Institute of Marine Biology of the Far-Eastern Branch of the Russian Academy of Sciences, 690038, Palchevskogo Str. 17, Vladivostok, Russia
4 UMR 6078 CNRS and Université Nice Sophia-Antipolis, Bat. J. Maetz, F06238 Villefranche sur mer cedex, France
Correspondence
Elena P. Ivanova
eivanova{at}swin.edu.au
Two marine bacterial strains, KMM 3823T and KMM 3836, isolated from a sipuncula (Phascolosoma japonicum), a common inhabitant of Troitsa Bay in the Gulf of Peter the Great (Sea of Japan), were studied. Comparative 16S rRNA gene sequence-based phylogenetic analysis placed these bacteria into a separate branch of the ‘Gammaproteobacteria’ within members of the genus Shewanella. KMM 3823T showed the highest similarity (96·6 %) with Shewanella fidelis. The DNA G+C contents of the two strains studied were 43·0 mol%. The level of DNA homology between these two strains was conspecific (93 %), indicating that they represent a single genospecies. These organisms were greenish-brown, Gram-negative, polarly flagellated, facultatively anaerobic, mesophilic (temperature range 4–30 °C), neutrophilic, haemolytic and were able to degrade elastin, gelatin and DNA. They were susceptible to ampicillin, carbenicillin, gentamicin and kanamycin. The predominant fatty acids were characteristic for shewanellas: 13 : 0-i, 15 : 0-i and 16 : 1(n-7); up to 6·7 % of eicosapentaenoic fatty acid, 20 : 5(n-3), was produced during growth at 28 °C. Phylogenetic evidence, confirmed by DNA hybridization and phenotypic characteristics revealed that the two bacteria studied constitute a new species, Shewanella waksmanii sp. nov., the type strain of which is KMM 3823T (=CIP 107701T=ATCC BAA-643T).
A full phylogenetic tree and a table showing the complete cellular fatty acid composition of Shewanella waksmanii is available as supplementary data in IJSEM Online.
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