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Marinobacter excellens sp. nov., isolated from sediments of the Sea of Japan

¹ Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Scences, 690022 Vladivostok, Pr. 100 Let Vladivostoku 159, Russia
² Industrial Research Institute, Swinburne University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia
³ Pacific Oceanological Institute, Far-Eastern Branch of the Russian Academy of Sciences, Baltiiskaya Str. 43, 690017, Vladivostok, Russia
⁴ Institute of Marine Biology, Far-Eastern Branch of the Russian Academy of Sciences, 690038, Palchevskogo Str. 17, Vladivostok, Russia
⁵ UMR6543 CNRS, Université de Nice Sophia Antipolis, Centre de Biochimie, Parc Valrose, F06108 Nice cedex 2, France

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

Five strains of halophilic, Gram-negative marine bacteria (KMM 3809^T, KMM 3814, KMM 3815, KMM 3817 and KMM 3818) were isolated from sediments collected from Chazhma Bay, Sea of Japan. Phylogenetic 16S rRNA gene sequence-based analysis placed these bacteria in a clade within the genus Marinobacter in the -Proteobacteria. KMM 3809^T showed highest 16S rRNA gene sequence similarity of 97·3 % to Marinobacter litoralis and 96·9 % to Marinobacter hydrocarbonoclasticus and Marinobacter aquaeolei. DNA–DNA hybridization between the five isolates was at the conspecific level (94–96 %) and that among the closest phylogenetic neighbours ranged from 45·0 to 62·5 %. The new organisms were susceptible to polymyxin. Predominant fatty acids were C_{16 : 0}, C_{16 : 1}9c, C_{16 : 1}7c and C_{18 : 1}9c. Phylogenetic evidence, along with phenotypic and genotypic characteristics, showed that the bacteria constituted a novel species of the genus Marinobacter. The name Marinobacter excellens sp. nov. is proposed for this species, with the type strain KMM 3809^T (=CIP 107686^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain KMM 3809^T is AY180101.

A table showing cellular fatty acid composition of Marinobacter species and further AFM images of cells of M. excellens are available as supplementary material in IJSEM Online.

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