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4 Classes of copper in proteins


Different copper sites in proteins lead to different classes of copper proteins which are classified as: 1) type 1 or blue copper proteins; 2) type 2 or mono nuclear catalytic copper proteins, 3) antiferromagnetically coupled binuclear copper (II) proteins, 4) Cu A or binuclear copper (I) proteins

Jahn-Teller distortion in blue copper proteins


The blue copper ligand field effect on the oxidized site. (A) shows the energy level diagram of an ideal tetrahedral structure which is orbitally degenerated and (B) shows the orbitally degenerated C3v structure; both have Jahn Teller distortion. (C) represents the Cs structure with no Jahn Teller distortion and D shows the splitting of the 3dxy level and 3dx2-y2 level by 10 000 cm-1

Coordination properties in copper proteins