NATURE OF THE ACTIVE-SITES IN HEMOCYANIN AND IRON-NICKEL HYDROGENASES- THE BOND VALENCE SUM APPROACH

The available crystal structure data on deoxyhaemocyanin and the exten ded X-ray absorption fine structure data on oxygenated haemocyanin and various forms of iron nickel hydrogenases have been analysed by the b ond valence sum method to examine the nature of the co-ordination sphe res around the metals in these enzymes.