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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 1217-1223, Copyright © 2002 by Society for General Microbiology

Sporanaerobacter acetigenes gen. nov., sp. nov., a novel acetogenic, facultatively sulfur-reducing bacterium

G. Hernandez-Eugenio, M. L. Fardeau, J. L. Cayol, BKC. Patel, P. Thomas, H. Macarie, J. L. Garcia and B. Ollivier
IRD, UR 101 Extremophiles, IFR-BAIM, Universites de Provence et de la Mediterranee, ESIL case 925, 163 avenue de Luminy, 13288 Marseille cedex 09, France

A strictly anaerobic, moderately thermophilic, sporulating rod, designated strain Lup 33(T), was isolated from an upflow anaerobic sludge blanket (UASB) reactor in Mexico. Strain Lup 33(T) possessed a few laterally inserted flagella, had a DNA G+C content of 32.2 mol% and grew optimally at pH 7.4 and 40 degrees C. Growth was observed at temperatures of up to 50 degrees C and was inhibited in the presence of 5% NaCl. Strain Lup 33(T) is heterotrophic and utilized some sugars, peptides and various single amino acids. Gelatin and casein were not used as energy sources. It performed the Stickland reaction and reduced elemental sulfur to sulfide. Acetate was the only fatty acid detected from glucose fermentation, whereas acetate together with isobutyrate and isovalerate were found as end products from peptone fermentation. Phylogenetically, strain Lup 33(T) branched with members of cluster XII of the order Clostridiales, with Clostridium hastiforme as the closest relative (similarity of 93%). On the basis of the phenotypic, genotypic and phylogenetic characteristics of the isolate, it is proposed as a novel species of a new genus, Sporanaerobacter acetigenes gen. nov., sp. nov. The type strain is strain Lup 33(T) (=DSM 13106(T)=CIP 106730(T)).


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