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Space-filling representation of the FeMo-cofactor (Left) and [4Fe:4S] cluster of aconitase (Right) using chemically appropriate radii for their atoms, including the protein side-chain ligands and homocitric acid. Dinitrogen is included for size comparison. The radii used to generate this figure were as follows: C, 1.5 Å; O, 1.4 Å; interstitial ligand (N3−), 1.4 Å; N in N2, 1.6 Å; S, 1.7 Å; Fe, 0.7 Å; and Mo, 0.8 Å (56, 57).
