Electron Transport Chain: Complex III and IV | Cell Bio | Video Textbooks - Preview

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The third complex of the electron transport chain, Q-cytochrome c oxidoreductase, is a dimeric protein that transfers electrons from Q to cytochrome c. Each monomer includes eleven subunits with three catalytic components- cytochrome b, cytochrome c1, and Rieske iron-sulfur protein.
Each cytochrome b is encoded by the mitochondrial genome and has two different b-type heme groups.