Figure 4 Fe-O-Fe center in ribonucleotide reductase. The two iron atoms are in close juxtaposition to bind dioxygen as the peroxide-anion o2~. Side chains of aspartic and glutamic acid residues as well as two histidine residues assist in linking the center to the protein. The center assists in the formation of a free radical that forms on a neighboring tyrosine residue. (After Frausto da Silva JJR and Williams RJP (1991) The Biological Chemistry of the Elements. The Inorganic Chemistry of Life. Oxford: Oxford University Press.)

enzyme is cytochrome c oxidase, the terminal electron acceptor in the mitochondrial electron transport chain and the enzyme capable of splitting a molecule of oxygen to form water.

4 cytochrome c (Fe3+)+ 2H2O

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