Plastocyanin

Plastocyanin is a single strand protein of the thylakoid membrane, (molecular weight 10,500), that plays an integral part in photosynthesis. This protein has a copper center, consisting of one copper atom surrounded by two nitrogen bonds and two sulfur bonds. This tetrahedral geometry is unusual for copper compounds in nature, but seems to minimize energies of oxidation and reduction for the copper atom at high pH. Plastocyanin is involved in photosystem I where it reacts with the P700+ complex losing one electron in the process.

 

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