Strategies for Substrate-Regulated P450 Catalysis: From Substrate Engineering to Co-catalysis

Area of Science:

• Biocatalysis and Enzyme Engineering
• Synthetic Chemistry
• Oxidative Metabolism

Background:

• Cytochrome P450 enzymes (P450s) are crucial biocatalysts for oxidation reactions, particularly C-H bond functionalization.
• Practical applications of P450s are limited by poor stability, low turnover rates, cofactor dependency (NAD(P)H), and narrow substrate scope for non-native compounds.
• Protein engineering offers a route to improve P450 catalysts intrinsically.

Purpose of the Study:

• To review emerging strategies focused on substrate regulation to enhance P450-catalyzed oxidation of non-native substrates.
• To explore substrate engineering, decoy molecules, and dual-functional small-molecule co-catalysis as methods to overcome P450 limitations.
• To discuss current challenges and future directions in P450 biocatalysis.

Main Methods:

• Review of literature on substrate-centric strategies for P450 biocatalysis.
• Analysis of substrate engineering approaches using anchoring groups to improve acceptance and selectivity.
• Examination of decoy molecules and co-catalysis for altering P450 active sites and enabling new peroxygenation capabilities.

Main Results:

• Substrate engineering, decoy molecules, and co-catalysis have demonstrated effectiveness in expanding the utility of P450s for non-native substrates.
• These substrate-focused strategies, often combined with protein engineering, have addressed key limitations of P450 enzymes.
• The reviewed approaches offer unique roles in enhancing P450 catalytic efficiency and scope.

Conclusions:

• Substrate regulation strategies represent a powerful complementary approach to protein engineering for advancing P450 biocatalysis.
• Continued research into these methods holds promise for overcoming existing challenges and unlocking new synthetic applications of P450 enzymes.
• Future work should focus on refining these strategies and exploring novel solutions for broader P450 applicability.