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Enhancing ferryl accumulation in H2O2-dependent cytochrome P450s.

Jose A Amaya1, Olivia M Manley2, Julia C Bian1

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, United States of America.

Journal of Inorganic Biochemistry
|December 23, 2023
PubMed
Summary

Researchers enhanced ferryl species accumulation in H2O2-dependent cytochrome P450s (CYPs) using a novel strategy. This method improves the efficiency of CYP decarboxylases like OleTSA, leading to near-stoichiometric yields.

Keywords:
CYP152Compound ICytochrome P450FerrylPeroxygenase

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Area of Science:

  • Biochemistry
  • Enzymology
  • Organic Chemistry

Background:

  • Cytochrome P450s (CYPs) are crucial enzymes involved in various biological processes.
  • The CYP152 family, dependent on hydrogen peroxide (H2O2), plays a role in oxidative catalysis.
  • Ferryl (iron(IV)-oxo) species are key intermediates in CYP enzymatic mechanisms.

Purpose of the Study:

  • To develop a facile strategy for enhancing ferryl species accumulation in H2O2-dependent CYPs.
  • To characterize a highly chemoselective CYP decarboxylase, OleTSA, from Staphylococcus aureus.
  • To investigate the relationship between resting spin-state equilibrium and Compound I (CpdI) accumulation.

Main Methods:

  • Characterization of Staphylococcus aureus CYP decarboxylase (OleTSA).
  • Examination of OleTSA Compound I (CpdI) accumulation with various fatty acid substrates.
  • Targeted mutagenesis of the proximal pocket to alter spin-state equilibrium.

Main Results:

  • OleTSA was found to be soluble at high concentrations.
  • Ferryl species accumulation demonstrated a dependence on resting spin-state equilibrium.
  • Mutagenesis favoring the high-spin form significantly enhanced CpdI accumulation to near-stoichiometric yields.

Conclusions:

  • A novel strategy effectively enhances ferryl species accumulation in H2O2-dependent CYPs.
  • Targeting spin-state equilibrium is a viable approach to optimize CYP catalytic intermediates.
  • This work provides insights into the mechanism and engineering of CYP decarboxylases for improved efficiency.