part_of intracellular part membrane part respiratory chain complex III GO:0045275 GO:0045285 ubiquinol-cytochrome c oxidoreductase complex electron transport complex III ubiquinol-cytochrome-c reductase complex cellular_component GO:0032842 cytochrome bc1 complex A protein complex that transfers electrons from ubiquinol to cytochrome c and translocates two protons across a membrane. The complex contains a core structure of three catalytic subunits: cytochrome b, the Rieske iron sulfur protein (ISP), and cytochrome c1, which are arranged in an integral membrane-bound dimeric complex; additional subunits are present, and vary among different species. Wikipedia:Coenzyme_Q_-_cytochrome_c_reductase complex III cytochrome bc(1) complex respiratory chain transmembrane transporter complex oxidoreductase complex