Figure 7.

Redox partner binding sites of plastocyanins. Space filling models of the structure were prepared using the coordinates from the PDB files of plastocyanins from a higher plant (Silene PDB code 1BYO), from a green alga (Ulva pertusa PDB code 1IUZ) and from a cyanobacteria (Synechococuss sp. PDB code 1BXU). The hydrophobic patch which is the site of interaction with cytochrome f and is present in all three is red. The acidic patch which also interacts with cytochrome f in the plastocyanins of plants and algae is purple. The additional acid patch found only in plastocyanin from plants is green. Copper is indicated as a blue sphere.