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Petrobacter succinatimandens gen. nov., sp. nov., a moderately thermophilic, nitrate-reducing bacterium isolated from an Australian oil well

¹ IRD, UR 101 Extrêmophiles, IFR-BAIM, Universités de Provence et de la Méditerranée, ESIL, Marseille, France
² School of Biomolecular and Biomedical Sciences, Griffith University, Brisbane, Australia

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

A novel Gram-negative, aerobic and moderately thermophilic bacterium, strain 4BON^T, was isolated from a non-water-flooded Australian terrestrial oil reservoir. Cells were non-spore-forming straight rods, which were motile by means of a polar flagellum. The optimum growth conditions were 55 °C, pH 6·9 and 0·5 % NaCl. Strain 4BON^T was oxidase- and catalase-positive; it grew on fumarate, pyruvate, succinate, formate, ethanol and yeast extract in the presence of oxygen or nitrate as terminal electron acceptor. Nitrate was reduced to nitrous oxide. The DNA G+C content of the strain was 58·6 mol%. The closest phylogenetic relative of strain 4BON^T was Hydrogenophilus thermoluteolus (similarity of 91·8 %), of the -Proteobacteria. As strain 4BON^T is physiologically and phylogenetically different from H. thermoluteolus, it is proposed that it be assigned to a novel species of a novel genus, Petrobacter succinatimandens gen. nov., sp. nov. The type strain is 4BON^T (=DSM 15512^T=CIP 107790^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Petrobacter succinatimandens 4BON^T is AY219713.

A transmission electron micrograph of strain 4BON^T and a graph showing the effect of temperature on the growth of strain 4BON^T cultivated on succinate are available from IJSEM Online.