Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: CoQH2 + 2 ferricytochrome c = CoQ + 2 ferrocytochrome c + 2 H+.
synonyms:
soluble cytochrome b562,
ubiquinone-cytochrome c reductase activity,
cytochrome a3/copper complex,
electron transporter, transferring electrons within cytochrome c oxidase complex activity,
cytochrome c1,
ubiquinol-cytochrome c2 reductase activity,
electron transporter, transferring electrons within CoQH2-cytochrome c reductase complex activity,