A new halophilic sulfate-reducing bacterium, strain GSL-But2, was isolated from surface sediment of the Southern arm of the Great Salt Lake, UT, USA. organism grew with a number of straight-chain fatty acids (C-C), 2-methylbutyrate, -alanine and pyruvate as electron donors. Butyrate was oxidized incompletely to acetate. Sulfate, but not sulfite or thiosulfate, serv as an electron acceptor. Growth was observed between 2 and 19% (w/v) NaCl with an optimum at 4-5% (w/v) NaCl. The optimal temperature and pH for growth were around 34°C and pH 6.5-7.3, respectively. The generation time under optimal conditions in defined medium was around 28 h, compared to 20 h in complex medium containing yeast extract. The G+C content was 35.0 mol%. 16S rRNA gene sequence analysis revealed that strain GSL-But2belongs to the family within the delta-subclass of the and suggested that strain GSL-But2represents a member of new genus. The name gen. nov., sp. nov. is proposed for this organism. The type strain of is strain GSL-But2(= DSM 117 = ATCC 700426).


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