ID 1.12.2.1 DE cytochrome-c3 hydrogenase. AN cytochrome c3 reductase. AN cytochrome hydrogenase. AN H2:ferricytochrome c3 oxidoreductase. CA 2 Fe(III)-[cytochrome c3] + H2 = 2 Fe(II)-[cytochrome c3] + 2 H(+). CC -!- Some forms of the enzyme contain nickel ([NiFe]-hydrogenases) and, CC of these, some contain selenocysteine ([NiFeSe]-hydrogenases). CC -!- Methylene blue and other acceptors can also be reduced. DR P80509, HC3L_ACIFR ; P80510, HC3S_ACIFR ; P21852, PHNL_DESVM ; DR P12944, PHNL_MEGGA ; P18188, PHNL_SOLFR ; Q06173, PHNS1_DESVH; DR P61429, PHNS2_DESVH; P13061, PHNS_DESDA ; P13062, PHNS_DESMU ; DR P21853, PHNS_DESVM ; P12943, PHNS_MEGGA ; P18187, PHNS_SOLFR ; //