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Pseudoalteromonas agarivorans sp. nov., a novel marine agarolytic bacterium

¹ Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch, Russian Academy of Sciences, 690022 Vladivostok, Prospekt 100 Let Vladivostoku, 159, Russia
² Institute of Marine Biology, Far-Eastern Branch, Russian Academy of Sciences, 690041 Vladivostok, Russia
³ GBF – Gesellschaft für Biotechnologische Forschung GmbH, D-38124 Braunschweig, Germany
⁴ Institute of Microbiology, Russian Academy of Sciences, 117811 Moscow, Russia
⁵ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Correspondence
Erko Stackebrandt
erko{at}dsmz.de

The phenotypic, genomic and phylogenetic characteristics of four aerobic, Gram-negative, non-fermentative, motile, non-pigmented, agarolytic Pseudoalteromonas-like bacteria, isolated from marine environments, have been investigated. These bacteria share DNA–DNA similarities above 86 %. Comparative 16S rDNA sequence analysis of strain KMM 255^T revealed its membership of the genus Pseudoalteromonas; it shares 99·9 % sequence similarity with Pseudoalteromonas distincta, Pseudoalteromonas elyakovii, Pseudoalteromonas atlantica and Pseudoalteromonas espejiana. DNA–DNA reassociation levels obtained for strain KMM 255^T and type strains of these four species and other Pseudoalteromonas species were below 45 %. The marine isolates differed from known species of the genus by the fact that the cells are motile by means of a single flagellum or two to four polar unsheathed flagella and by an inability to utilize most organic compounds. On the basis of phenotypic, DNA–DNA hybridization and phylogenetic data, it is concluded that the isolates represent a novel species within the genus Pseudoalteromonas, for which the name Pseudoalteromonas agarivorans sp. nov. is proposed. The type strain is strain KMM 255^T (=DSM 14585^T).

The GenBank accession number for the 16S rDNA sequence of strain KMM 255^T is AJ417594.

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