Plastocyanin

Plastocyanin is an electron carrier in the system that operates between photosystem II and I (Figure 17.12). Plastocyanin accepts electrons from cytochrome f of the cytochrome b 6f complex and donates them to photosystem I. Plastocyanin contains a copper atom, which is reduced to Cu+ upon accepting an electron and Cu2+ upon losing the electron.

See also: Photosystem II, Photosystem I, Cyclic Electron Flow, Cytochrome b 6f