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Int J Syst Evol Microbiol 54 (2004), 1953-1957; DOI  10.1099/ijs.0.63069-0
© 2004 International Union of Microbiological Societies

Thermosipho atlanticus sp. nov., a novel member of the Thermotogales isolated from a Mid-Atlantic Ridge hydrothermal vent

Laurent Urios1, Valérie Cueff-Gauchard1, Patricia Pignet1, Anne Postec1, Marie-Laure Fardeau2, Bernard Ollivier2 and Georges Barbier1

1 Laboratoire de Microbiologie et de Biotechnologie des Extrêmophiles, IFREMER, Centre de Brest, BP 70, 29280 Plouzané, France
2 Laboratoire IRD de Microbiologie des Anaérobies, UR 101, Universités de Provence et de la Méditerranée, CESB-ESIL, case 925, 163 Avenue de Luminy, 13288 Marseille, France

Correspondence
Georges Barbier
Georges.Barbier{at}ifremer.fr
or
Georges.Barbier{at}univ-brest.fr

A novel anaerobic, thermophilic and heterotrophic bacterium, designated strain DV1140T, was isolated from a deep-sea hydrothermal vent sample from the Mid-Atlantic Ridge. The cells were non-motile straight rods, 1·8 µm long and 0·4 µm wide, surrounded by an outer sheath-like structure (toga). They grew at 45–80 °C (optimum 65 °C), pH 5·0–9·0 (optimum pH 6·0) and at sea salt concentrations of 20–60 g l–1 (optimum 30 g l–1). Strain DV1140T was able to ferment yeast extract, peptone, brain heart infusion, gelatin, starch, galactose, arabinose, glucose, trehalose and cellobiose. The fermentation products identified on glucose in the presence of yeast extract and peptone were acetate, isovalerate and hydrogen. The G+C content of the genomic DNA was 33 mol%. Phylogenetic analysis of the 16S rRNA gene sequence (GenBank accession number AJ577471) located the strain within the genus Thermosipho in the bacterial domain. On the basis of 16S rRNA gene sequence comparisons, and physiological and biochemical characteristics, the isolate represents a novel species, for which the name Thermosipho atlanticus sp. nov. is proposed. The type strain is DV1140T (=CIP 108053T=DSM 15807T).

Published online ahead of print on 7 May 2004 as DOI 10.1099/ijs.0.63069-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain DV1140T is AJ577471.






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