Stockholms Universitet, Avdelningen för Biokemi, Arrheniuslaboratoriet, Fack, S. 104 05, Stockholm, Sweden
Abstract:
Purified Complex III from beef heart contains two b cytochromes: a high-potential (Em 7.2 = +93 mV) cytochrome b-562 which can be enzymatically reduced, and a low-potential (Em 7.2 = ?34 mV) cytochrome b-565 which is reduced only by dithionite. The two components each contribute approximately 50% to the total cytochrome b of Complex III. Cytochrome c1 of Complex III titrates with a half-reduction potential of +232 mV.