Multiscale Simulations on the Catalytic Plasticity of CYP76AH1

Area of Science:

• Biochemistry
• Enzymology
• Natural Product Biosynthesis

Background:

• Cytochrome P450 enzymes (CYPs) exhibit catalytic promiscuity and fidelity in modifying terpenoid natural products.
• CYP76AH1 plays a crucial role in the biosynthesis of tanshinone, a medicinal norditerpenoid.

Purpose of the Study:

• To investigate the protein conformational dynamics, ligand binding, and catalytic mechanism of wild-type and mutant CYP76AH1.
• To elucidate the enzymatic mechanism responsible for the diverse product formation by mutant CYP76AH1.

Main Methods:

• Classical molecular dynamics simulations
• Metadynamics simulations
• Density Functional Theory (DFT) calculations

Main Results:

• Detailed analysis of protein conformational dynamics and ligand binding poses in CYP76AH1.
• Identification of a plausible enzymatic mechanism for mutant CYP76AH1, explaining the generation of various products.
• Insights into the structural and dynamic factors governing CYP76AH1's catalytic activity.

Conclusions:

• The study provides a mechanistic understanding of mutant CYP76AH1's activity.
• Findings offer valuable guidance for the rational protein engineering of CYP76 family enzymes.
• This work contributes to the broader understanding of P450 enzyme function in natural product biosynthesis.