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Vulcanithermus mediatlanticus gen. nov., sp. nov., a novel member of the family Thermaceae from a deep-sea hot vent

¹ Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, 117811 Moscow, Russia
² UMR 6539, Centre National de la Recherche Scientifique & Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, 29280 Plouzané, France
³ A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky Prospect 33, 119071 Moscow, Russia
⁴ DSMZ – German Collection of Microorganisms and Cell Cultures, Mascheroder Weg 1b, 38124 Braunschweig, Germany

Correspondence
M. L. Miroshnichenko
alfamirr{at}mail.ru

A novel thermophilic, microaerophilic, facultatively chemolithoheterotrophic bacterium designated strain TR^T was isolated from a sample of a deep-sea hydrothermal chimney collected at the Rainbow vent field on the Mid-Atlantic Ridge (36°14'N). Gram-negative, non-spore-forming, non-motile rods occurred singly or in pairs. The organism grew in the temperature range 37–80 °C with an optimum at 70 °C and at pH 5·5–8·4 with an optimum around 6·7. The NaCl range for growth was 10–50 g l^-1 with an optimum of 30 g l^-1. Strain TR^T grew chemoorganoheterotrophically with carbohydrates, proteinaceous substrates, organic acids and alcohols using oxygen or nitrate as electron acceptors. The isolate was able to grow at oxygen concentrations from 0·5 to 21 %. Oxygen concentrations that promoted fastest growth ranged from 4 to 8 % under agitation. The novel isolate was able to grow lithoheterotrophically with molecular hydrogen as the energy source. The G+C content of the genomic DNA was 68·4 mol%. Phylogenetic analysis of the 16S rDNA sequence placed strain TR^T within the phylum Deinococcus–Thermus of the Bacteria. On the basis of phenotypic and phylogenetic data, it is proposed that this isolate should be described as a member of a novel species of a new genus as Vulcanithermus mediatlanticus gen. nov., sp. nov. The type strain is TR^T (=DSM 14978^T =VKM B-2292^T =JCM 11956^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain TR^T is AJ507298.

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