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Desulfonauticus submarinus gen. nov., sp. nov., a novel sulfate-reducing bacterium isolated from a deep-sea hydrothermal vent

IRD, UR 101 Extrêmophiles, IFR-BAIM, Universités de Provence et de la Méditerranée, ESIL, case 925, 163 avenue de la Méditerranée, 13288 Marseille cedex 09, France

Correspondence
Bernard Ollivier
ollivier{at}esil.univ-mrs.fr

A novel moderately thermophilic, hydrogenotrophic, sulfate-reducing bacterium, strain 6N^T (=DSM 15269^T=CIP 107713^T), was isolated from matrixes of Alvinella and Riftia originating from deep-sea hydrothermal-vent samples collected on the 13°N East-Pacific Rise at a depth of approximately 2600 m. It was a Gram-negative, non-sporulating, curved rod, motile with one polar flagellum, that did not possess desulfoviridin. It grew at temperatures ranging from 30 to 60 °C, with an optimum at 45 °C, in the presence of 0–5 % NaCl (optimum 2 %). Strain 6N^T utilized only H₂/CO₂ and formate as electron donors with acetate as carbon source. Sulfate, sulfite, thiosulfate and elemental sulfur were used as terminal electron acceptors during hydrogen oxidation. The G+C content of DNA was 34·4 mol%. Strain 6N^T grouped with members of the family Desulfohalobiaceae in the -subclass of the Proteobacteria. Its closest phylogenetic relative was Desulfonatronovibrio hydrogenovorans, with only 90 % similarity between the sequences of the genes encoding 16S rRNA. Because of significant phylogenetic differences from all sulfate-reducing bacteria described so far in the domain Bacteria, this novel thermophile is proposed to be assigned to a new genus and species, Desulfonauticus submarinus gen. nov., sp. nov.

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