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This study demonstrates the ability ofDesulfitobacterium spp. to utilize aliphatic sulfonates as terminal electron acceptors (TEA) for growth. Isethionate (2-hydroxyethanesulfonate) reduction byDesulfitobacterium hafniense resulted in acetate as well as sulfide accumulation in accordance with the expectation that the carbon portion of isethionate was oxidized to acetate and the sulfur was reduced to sulfide. The presence of a polypeptide, approximately 97 kDa, was evident in isethionate-grown cells ofDesulfitobacterium hafniense ,Desulfitobacterium sp. strain PCE 1, and the two sulfate-reducing bacteria (SRB)—Desulfovibrio desulfuricans IC1 (T. J. Lie, J. R. Leadbetter, and E. R. Leadbetter, Geomicrobiol. J. 15:135–149, 1998) andDesulfomicrobium norvegicum ; this polypeptide was not detected when these bacteria were grown on TEA other than isethionate, suggesting involvement in its metabolism. The sulfate analogs molybdate and tungstate, effective in inhibiting sulfate reduction by SRB, were examined for their effects on sulfonate reduction. Molybdate effectively inhibited sulfonate reduction by strain IC1 and selectively inhibited isethionate (but not cysteate) reduction byDesulfitobacterium dehalogenans andDesulfitobacterium sp. strain PCE 1.Desulfitobacterium hafniense , however, grew with both isethionate and cysteate in the presence of molybdate. In contrast, tungstate only partially inhibited sulfonate reduction by both SRB andDesulfitobacterium spp. Similarly, another inhibitor of sulfate reduction, 1,8-dihydroxyanthraquinone, effectively inhibited sulfate reduction by SRB but only partially inhibited sulfonate reduction by both SRB andDesulfitobacterium hafniense .

applied and environmental microbiology

Sulfonates as Terminal Electron Acceptors for Growth of Sulfite-Reducing Bacteria (<i>Desulfitobacterium</i>spp.) and Sulfate-Reducing Bacteria: Effects of Inhibitors of Sulfidogenesis

Sulfonates as Terminal Electron Acceptors for Growth of Sulfite-Reducing Bacteria (Desulfitobacteriumspp.) and Sulfate-Reducing Bacteria: Effects of Inhibitors of Sulfidogenesis