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Type: Journal article
Title: The crystal structures of 4-methoxybenzoate bound CYP199A2 and CYP199A4: structural changes on substrate binding and the identification of an anion binding site
Author: Bell, S.
Yang, W.
Tan, A.
Zhou, R.
Johnson, E.
Zhang, A.
Zhou, W.
Rao, Z.
Wong, L.
Citation: Dalton Transactions (Print Edition), 2012; 41(28):8703-8714
Publisher: Royal Soc Chemistry
Issue Date: 2012
ISSN: 1477-9226
Statement of
Stephen G. Bell, Wen Yang, Adrian B. H. Tan, Ruimin Zhou, Eachan O. D. Johnson, Aili Zhang, Weihong Zhou, Zihe Rao, and Luet-Lok Wong
Abstract: The crystal structures of the 4-methoxybenzoate bound forms of cytochrome P450 enzymes CYP199A2 and CYP199A4 from the Rhodopseudomonas palustris strains CGA009 and HaA2 have been solved. The structures of these two enzymes, which share 86% sequence identity, are very similar though some differences are found on the proximal surface. In these structures the enzymes have a closed conformation, in contrast to the substrate-free form of CYP199A2 where an obvious substrate access channel is observed. The switch from an open to a closed conformation arises from pronounced residue side-chain movements and alterations of ion pair and hydrogen bonding interactions at the entrance of the access channel. A chloride ion bound just inside the protein surface caps the entrance to the active site and protects the substrate and the heme from the external solvent. In both structures the substrate is held in place via hydrophobic and hydrogen bond interactions. The methoxy group is located over the heme iron, accounting for the high activity and selectivity of these enzymes for oxidative demethylation of the substrate. Mutagenesis studies on CYP199A4 highlight the involvement of hydrophobic (Phe185) and hydrophilic (Arg92, Ser95 and Arg243) amino acid residues in the binding of para-substituted benzoates by these enzymes.
Keywords: Rhodopseudomonas; Chlorides; Cytochrome P-450 Enzyme System; Bacterial Proteins; Crystallization; Binding Sites; Protein Conformation; Substrate Specificity; Hydroxybenzoates; Hydroxybenzoate Ethers
Rights: © The Royal Society of Chemistry 2012
RMID: 0020121221
DOI: 10.1039/C2DT30783A
Appears in Collections:Chemistry and Physics publications

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