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Further information on the Cytochrome b-c complex site.
The mobile head of the iron sulfur protein (ISP) (red spacefilling model) of the complex moves between docking interfaces on cytochrome b (light blue) and cytochrome c1 (green), while the anchor (dark blue) remains stationery. Electron transfer occurs from QH2 at the cytochrome b interface, and to heme c1 at the cytochrome c1 interface, and the ISP moves back and forth between these sites as the enzyme turns over. Reference.