BIO 361 Lecture Notes - Lecture 27: Cytochrome C1, Rieske Protein, Cytochrome C
10 Jul 2016
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Document Summary
Complex iii accepts the reduced ubiquinone that was made by complexes i and ii, and will then transfer the electrons from that reduced ubiquinone to cytochrome c. Cytochrome c is a protein that binds to the outer face of the inner membrane, but it is not an integral membrane protein at all. Complex iii is a receptor for cytochrome c, and is a membrane bound receptor. Cytochrome c accepts electrons from ubiquinone, making use of complex iii. Complex iii contains not only a ubiquinone and a binding site for cytochrome c, but many membrane-bound cytochromes (b-type cytochromes), another cytochrome known as cytochrome c1, and an iron-sulfur complex called rieske complex. Complex iii makes use of internal b-type cyotchromes and rieske complex to move both electrons and protons. The proton moving machinery in complex iii is not mediated by conformational changes in protons, but is mediated by selective movements of ubiquinone itself.
