4dnj | pdb_00004dnj

The crystal structures of 4-methoxybenzoate bound CYP199A2

spinqualitylabelsall models 4dnj, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4dnj is a 1 chain structure with sequence from Rhodopseudomonas palustris CGA009. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ANN, CL, HEM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CYPA2_RHOPA] The oxidative demethylation of 4-methoxybenzoate requires the participation of the monooxygenase CYP199A2, the ferredoxin-like protein ThcC/RPA1872 and a ferredoxin reductase to mediate the transfer of electrons from NADH to CYP199A2. It is also active with 4-ethylbenzoate. Publication Abstract from PubMed 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. The crystal structures of 4-methoxybenzoate bound CYP199A2 and CYP199A4: structural changes on substrate binding and the identification of an anion binding site.,Bell SG, Yang W, Tan AB, Zhou R, Johnson EO, Zhang A, Zhou W, Rao Z, Wong LL Dalton Trans. 2012 Jul 28;41(28):8703-14. Epub 2012 Jun 13. PMID:22695988 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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