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Cytochrome P450 Enzyme Design by Constraining the Catalytic Pocket in a Diffusion Model.

Qian Wang1,2,3, Xiaonan Liu1,2,3, Hejian Zhang1,3,4

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Researchers uncovered key residues driving functional innovation in cytochrome P450 enzymes. A new model explains how these biocatalysts evolve, enabling the creation of artificial P450s with enhanced catalytic capabilities.

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Area of Science:

  • Biochemistry
  • Enzyme Engineering
  • Molecular Evolution

Background:

  • Cytochrome P450 enzymes are crucial biocatalysts, yet the molecular mechanisms of their functional innovation remain poorly understood.
  • Understanding enzyme evolution is key to harnessing and engineering these versatile proteins for novel applications.

Purpose of the Study:

  • To elucidate the molecular mechanism behind functional innovation in cytochrome P450 enzymes.
  • To identify key residues and propose a model for P450 catalytic pocket evolution.
  • To develop a computational approach for designing artificial P450 enzymes with tailored functions.

Main Methods:

  • Ancestral sequence reconstruction
  • Reverse mutation assays
  • Progressive forward accumulation
  • De novo diffusion modeling (P450Diffusion)

Main Results:

  • Identified 5 critical founder residues in the flavone 6-hydroxylase (F6H) catalytic pocket.
  • Proposed a '3-point fixation' model for P450 functional innovation.
  • Generated 17 artificial P450s using P450Diffusion; 10 showed significant F6H activity.
  • Achieved a 1.3- to 3.5-fold increase in catalytic capacity in 6 engineered P450s compared to natural CYP706X1.

Conclusions:

  • The study reveals a design principle for P450 catalytic pockets based on key residue interactions.
  • The P450Diffusion model successfully generates artificial P450 enzymes with enhanced or novel functions.
  • This work provides insights into both natural P450 evolution and the rational design of biocatalysts.