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Mechanistic Insight into Peptidyl-Cysteine Oxidation by the Copper-Dependent Formylglycine-Generating Enzyme.

Yao WuCong ZhaoYanzhuang SuSason S ShaikWenzhen Lai
Published in: Angewandte Chemie (International ed. in English) (2022)
The copper-dependent formylglycine-generating enzyme (FGE) catalyzes the oxygen-dependent oxidation of specific peptidyl-cysteine residues to formylglycine. Our QM/MM calculations provide a very likely mechanism for this transformation. The reaction starts with dioxygen binding to the tris-thiolate Cu I center to form a triplet Cu II -superoxide complex. The rate-determining hydrogen atom abstraction involves a triplet-singlet crossing to form a Cu II -OOH species that couples with the substrate radical, leading to a Cu I -alkylperoxo intermediate. This is accompanied by proton transfer from the hydroperoxide to the S atom of the substrate via a nearby water molecule. The subsequent O-O bond cleavage is coupled with the C-S bond breaking that generates the formylglycine and a Cu II -oxyl complex. Moreover, our results suggest that the aldehyde oxygen of the final product originates from O 2 , which will be useful for future experimental work.
Keyphrases
  • electron transfer
  • aqueous solution
  • molecular dynamics
  • hydrogen peroxide
  • metal organic framework
  • energy transfer
  • density functional theory
  • dna binding
  • molecular dynamics simulations
  • amino acid
  • genetic diversity