Cytochrome b 6 f

Cytochrome b 6 f is a is part of the electron transport chain that transfers electrons from photosystem II to photosystem I. Cytochrome b 6 f is a complex of proteins that includes cytochromes f, b 6, and an iron sulfur protein. Cytochrome b 6f accepts electrons from plastoquinone QH 2 and passes them to plastocyanin (Figure 17.12). In addition to transferring electrons, the cytochrome b 6 f complex pumps protons into the thylakoid lumen, helping to build the proton gradient, which is used by the CF 0-CF 1 complex to make ATP.

See also: Photosystem II, Photosystem I, Photosystem Summary, Cyclic Electron Flow, Figure 17.16

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