8WS4 image
Entry Detail
PDB ID:
8WS4
Keywords:
Title:
Crystal structure of the CYP199A4 mutant F182A in complex with 4-methoxybenzoic acid
Biological Source:
PDB Version:
Deposition Date:
2023-10-16
Release Date:
2024-10-16
Method Details:
Experimental Method:
Resolution:
1.53 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cytochrome P450
Chain IDs:A
Chain Length:420
Number of Molecules:1
Biological Source:Rhodopseudomonas palustris HaA2
Primary Citation
Crucial gating residues govern the enhancement of peroxygenase activity in an engineered cytochrome P450 O -demethylase.
Chem Sci 15 8062 8070 (2024)
PMID: 38817576 DOI: 10.1039/d4sc02418d

Abstact

P450-catalyzed O-demethylation reactions have recently attracted particular attention because of their potential applications in lignin bioconversion. We recently enabled the peroxygenase activity of CYP199A4, a NADH-dependent cytochrome P450 monooxygenase from Rhodopseudomonas palustris, by engineering a hydrogen peroxide (H2O2) tunnel. In this report, we reveal by crystallography and molecule dynamics simulations that key residues located at one of the water tunnels in CYP199A4 play a crucial gating role, which enhances the peroxygenase activity by regulating the inflow of H2O2. These results provide a more complete understanding of the mechanism by which monooxygenase is converted into peroxygenase activity through the H2O2 tunnel engineering (HTE) strategy. Furthermore, a library of engineered CYP199A4 peroxygenases was constructed to explore their application potentials for O-demethylation of various methoxy-substituted benzoic acid derivatives. The engineered CYP199A4 peroxygenases showed good functional group tolerance and preferential O-demethylation at the meta- or para-position, indicating potential O-demethylation of H- and G-type lignin monomers. This work reveals the feasibility of the HTE strategy in creating P450 peroxygenase from a mechanistic perspective, laying the foundation for developing an effective P450 O-demethylase applicable in lignin bioconversion.

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