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Int J Syst Evol Microbiol 54 (2004), 2169-2173; DOI  10.1099/ijs.0.02926-0
© 2004 International Union of Microbiological Societies

Mahella australiensis gen. nov., sp. nov., a moderately thermophilic anaerobic bacterium isolated from an Australian oil well

Monica Bonilla Salinas1, Marie-Laure Fardeau1, Pierre Thomas1, Jean-Luc Cayol1, Bharat K. C. Patel2 and Bernard Ollivier1

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-positive, anaerobic and moderately thermophilic bacterium, strain 50-1 BONT, was isolated from an Australian terrestrial oil reservoir. Cells were spore-forming straight rods, motile by peritrichous flagella. The optimum growth conditions were 50 °C, pH 7·5 and 0·1 % NaCl. Strain 50-1 BONT fermented arabinose, cellobiose, fructose, galactose, glucose, mannose, sucrose, xylose and yeast extract. Glucose was fermented mainly into lactate, formate, hydrogen and CO2. The major end product of pyruvate fermentation was acetate together with H2 and CO2. Thiosulfate, sulfate, elemental sulfur and nitrate were not used as terminal electron acceptors. The DNA G+C content was 55·5 mol%. The closest phylogenetic relative of strain 50-1 BONT was Thermoanaerobacterium thermosulfurigenes (16S rRNA gene sequence similarity of 85·7 %). As strain 50-1 BONT was physiologically and phylogenetically different from members of the order ‘Thermoanaerobacteriales’, it is proposed that strain 50-1 BONT (=DSM 15567T=CIP 107919T) be classified as the type strain of a novel species of a new genus, Mahella australiensis gen. nov., sp. nov.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 50-1 BONT is AY331143.






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