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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: J Steroid Biochem Mol Biol. 2015 Oct 22;161:13–23. doi: 10.1016/j.jsbmb.2015.10.005

Figure 1.

Figure 1

(A) A cartoon showing the cytochrome P450 heme active site (reduced or ferrous, Fe+2) bound to CO ligand. (B), (C), (D): Frontier molecular orbital interaction between the d orbitals of Fe and the p* antibonding molecular orbitals of CO (B and C), or sp-molecular orbital of CO and the dz2 orbital of Fe (D). gr1