8g35

From Proteopedia

Crystal structure of F182L-CYP199A4 in complex with (S)-4-(2-hydroxy-3-oxobutan-2-yl)benzoic acid

Structural highlights

8g35 is a 1 chain structure with sequence from Rhodopseudomonas palustris HaA2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2Å
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

Q2IU02_RHOP2

Publication Abstract from PubMed

The cytochrome P450 (CYP) superfamily of heme monooxygenases has demonstrated ability to facilitate hydroxylation, desaturation, sulfoxidation, epoxidation, heteroatom dealkylation, and carbon-carbon bond formation and cleavage (lyase) reactions. Seeking to study the carbon-carbon cleavage reaction of alpha-hydroxy ketones in mechanistic detail using a microbial P450, we synthesized alpha-hydroxy ketone probes based on the physiological substrate for a well-characterized benzoic acid metabolizing P450, CYP199A4. After observing low activity with wild-type CYP199A4, subsequent assays with an F182L mutant demonstrated enzyme-dependent C-C bond cleavage toward one of the alpha-hydroxy ketones. This C-C cleavage reaction was subject to an inverse kinetic solvent isotope effect analogous to that observed in the lyase activity of the human P450 CYP17A1, suggesting the involvement of a species earlier than Compound I in the catalytic cycle. Co-crystallization of F182L-CYP199A4 with this alpha-hydroxy ketone showed that the substrate bound in the active site with a preference for the (S)-enantiomer in a position which could mimic the topology of the lyase reaction in CYP17A1. Molecular dynamics simulations with an oxy-ferrous model of CYP199A4 revealed a displacement of the substrate to allow for oxygen binding and the formation of the lyase transition state proposed for CYP17A1. This demonstration that a correctly positioned alpha-hydroxy ketone substrate can realize lyase activity with an unusual inverse solvent isotope effect in an engineered microbial system opens the door for further detailed biophysical and structural characterization of CYP catalytic intermediates.

Engineering C-C Bond Cleavage Activity into a P450 Monooxygenase Enzyme.,Miller JC, Lee JHZ, Mclean MA, Chao RR, Stone ISJ, Pukala TL, Bruning JB, De Voss JJ, Schuler MA, Sligar SG, Bell SG J Am Chem Soc. 2023 Apr 26;145(16):9207-9222. doi: 10.1021/jacs.3c01456. Epub , 2023 Apr 11. PMID:37042073^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Miller JC, Lee JHZ, Mclean MA, Chao RR, Stone ISJ, Pukala TL, Bruning JB, De Voss JJ, Schuler MA, Sligar SG, Bell SG. Engineering C-C Bond Cleavage Activity into a P450 Monooxygenase Enzyme. J Am Chem Soc. 2023 Apr 26;145(16):9207-9222. PMID:37042073 doi:10.1021/jacs.3c01456