Desulfospira joergensenii, gen. nov., sp. nov., a new sulfate-reducing bacterium isolated from marine surface sediment
1997
Finster, K. | Liesack, W. | Tindall, B.J.
A new Gram-negative sulfur-reducing eubacterium was isolated from iron-rich oxidized marine surface sediment with elemental sulfur and butyrate. Elemental sulfur can be substituted by sulfate. In addition, thiosulfate and sulfite are used as electron acceptors. The strain, named B331, grows well in hydrogen sulfide free medium in the presence of high concentrations of amorphous iron hydroxide. The substrate spectrum is versatile and includes hydrogen, fatty acids, dicarboxylic acids, oxoacids, hydroxyacids, compatible solutes and yeast extract. A fermentative type of metabolism was not observed. The cells are vibrio-shaped and not motile. The G+C content of the genomic DNA is 49.3 mol%. Cytochromes are present, desulfoviridin is not. The major lipoquinones present are menaquinones including both MK-7 and MK-7. The fatty acid composition comprises mainly unbranched fatty acids . The major polar lipids are phosphatidyl glycerol and phosphatidyl ethanolamine. Comparative 16S rDNA sequence analysis placed strain B331 into the delta subgroup of proteobacteria originating in a common root with members of the genera Desulfobacter and Desulfobacula. Within this group it forms a distinct line of descent with Desulfobacula. Within this group it forms a distinct line of descent with Desulfobacula toluolica as the most closely related microorganism. Strain B331 is described as the type species and type strain, respectively, of a new taxon, Desulfospira joergensenii gen. nov., sp. nov.
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