Desulfonispora thiosulfatigenes gen. nov., sp. nov., a taurine-fermenting, thiosulfate-producing anaerobic bacterium

Abstract

Strain GKNTAUT has been described as a bacterium able to ferment the organosulfonate taurine (2-aminoethanesulfonate) quantitatively to acetate, ammonia and thiosulfate, an unusual metabolic product. This novel fermentation has now also been observed in four independent isolates from two continents. All five organisms were strictly anaerobic, Gram-positive, motile, spore-forming bacteria. Enrichments with isethionate (2-hydroxyethanesulfonate) and cysteate (2-amino-3-sulfopropionate), in contrast, yielded bacteria that disproportionated the sulfonate to sulfate and sulfide. The phylogenetic location of the taurine fermenters was analysed on the basis of 16S rDNA sequences. Strain GKNTAUT (= DSM 11270T = ATCC 700533T) is described as the type strain of a new genus and species, for which the name Desulfonispora thiosulfatigenes gen. nov., sp. nov. is proposed.