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1School of Microbiology and Immunology, The University of New South Wales, Sydney 2052, Australia
2Center for Environmental Biotechnology, University of Tennessee, 10515 research Drive, Suite 300, Knoxville, TN 37932, USA
3Tel: +61 2 9385 2601. Fax: +61 2 9385 1591. e-mail: c.holmstrom{at}unsw.edu.au
ABSTRACT
A dark-green-pigmented marine bacterium, previously designated D2, which produces components that are inhibitory to common marine fouling organisms has been characterized and assessed for taxonomic assignment. Based on direct double-stranded sequencing of the 16S rRNA gene, D2Twas found to show the highest similarity (93%) to members of the genus Pseudoalteromonas. The G+C content of D2Tis 42 mol%, and it is a facultatively anaerobic rod and oxidase-positive. D2Tis motile by a sheathed polar flagellum, exhibited non-fermentative metabolism and required sodium ions for growth. The strain was not capable of using citrate, fructose, sucrose, sorbitol and glycerol but it utilizes mannose and maltose and hydrolyses gelatin. The molecular evidence, together with phenotypic characteristics, showed that this bacterium which produces an antifouling agent constitutes a new species of the genus Pseudoalteromonas. The name Pseudoalteromon as tunicata is proposed for this bacterium, and the type strain is D2T(= CCUG 26757T).
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