Plastocyanin
![Structure from PDB 3BQV.](/Images/godic/202501/01/Plastocyanin-from-3BQV-3D-cartoon-balls4448.png")
![The copper site in plastocyanin, with the four amino acids that bind the metal labelled](/Images/godic/202501/01/Plastocyanin_copper_binding4448.png")
Plastocyanin is a copper-containing protein involved in electron-transfer. The protein is a monomer, with a molecular weight around 10,500 Daltons, and 99 amino acids in most vascular plants. It is a member of the plastocyanin family of copper-binding proteins.