ID 1.8.2.5 DE thiosulfate reductase (cytochrome). CA 2 Fe(III)-[cytochrome c3] + hydrogen sulfide + sulfite = 2 Fe(II)- CA [cytochrome c3] + thiosulfate. CC -!- The enzyme is found in sulfate-reducing bacteria. CC -!- The source of the electrons is molecular hydrogen, via EC 1.12.2.1. CC -!- The organisms utilize the sulfite that is produced for energy CC generation by EC 1.8.99.5. //