ID 1.1.2.5 DE D-lactate dehydrogenase (cytochrome c-553). CA (R)-lactate + 2 Fe(III)-[cytochrome c553] = 2 Fe(II)-[cytochrome c553] + CA 2 H(+) + pyruvate. CC -!- The enzyme from the sulfate-reducing bacterium Desulfovibrio vulgaris CC can also act on (R)-2-hydroxybutanoate. //