Background: P450 BM3 is a high activity enzyme with biotechnological potential. Results: Mutations perturbing P450 BM3's conformational state and active site facilitate human P450-like oxidation of the drug omeprazole. Conclusion: Conformational destabilization enables P450 BM3 to explore novel conformations and accept diverse substrates. Significance: "Gatekeeper" mutations that decrease the energetic barrier for transition to the substrate-bound state can reconfigure P450 BM3 specificity and reactivity.
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