Abstract

An enzyme which catalyzes the reduction of bisulfite to sulfide and thiosulfate was purified from extracts of the sulfate-reducing bacterium, Desulfovibrio vulgaris . Trithionate was not a product of this reaction nor was it or thiosulfate reduced by the enzyme. High substrate concentrations inhibited sulfide but not thiosulfate formation. The enzyme was named bisulfite reductase II to distinguish it from bisulfite reductase which reduces bisulfite to trithionate.

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