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. 2003 May 27;100(12):6998–7002. doi: 10.1073/pnas.0732000100

Fig. 1.

Fig. 1.

Common catalytic cycle in most cytochromes P450. 1, Resting state with water coordinated to iron; 2, substrate binding displaces coordinated water and first electron-reduction results in O2 binding; 3, second electron reduction and distal oxygen protonation liberates a water molecule and the active compound I; 4, substrate (camphor in P450cam) hydroxylation and resting-state regeneration.