1ued

Crystal Structure of OxyC a Cytochrome P450 Implicated in an Oxidative C-C Coupling Reaction During Vancomycin Biosynthesis.

spinqualitylabelsall models 1ued, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ued is a 2 chain structure with sequence from Amycolatopsis orientalis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: HEM, PEG, PG4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function C5C4_AMYOR Involved in the coupling of aromatic side chains of the heptapeptide of vancomycin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Gene inactivation studies point to the involvement of OxyC in catalyzing the last oxidative phenol coupling reaction during glycopeptide antibiotic biosynthesis. Presently, the substrate and exact timing of the OxyC reaction are unknown. The substrate might be the bicyclic heptapeptide or a thioester derivative bound to a protein carrier domain. OxyC from the vancomycin producer Amycolatopsis orientalis was produced in Escherichia coli and crystallized, and its structure was determined to 1.9 A resolution. OxyC gave UV-visible spectra characteristic of a P450-like hemoprotein in the low spin ferric state. After reduction to the ferrous state by dithionite the CO-ligated form gave a 450-nm peak in a UV-difference spectrum. The addition of vancomycin aglycone to OxyC produced type I changes to the UV spectrum. OxyC exhibits the typical P450-fold, with the Cys ligand loop containing the signature sequence FGHGX-HXCLG and Cys-356 being the proximal axial thiolate ligand of the heme iron. The observation of a water molecule bound to the heme iron is consistent with the UV-visible spectra of OxyC indicating a low spin heme. A polyethylene glycol molecule occupying the active site might mimic the bicyclic heptapeptide substrate. Analysis of the structure of Oxy-proteins and other P450s indicates regions that might be involved in binding of the redox partner and possibly the protein carrier domain. Crystal structure of OxyC, a cytochrome P450 implicated in an oxidative C-C coupling reaction during vancomycin biosynthesis.,Pylypenko O, Vitali F, Zerbe K, Robinson JA, Schlichting I J Biol Chem. 2003 Nov 21;278(47):46727-33. Epub 2003 Jul 29. PMID:12888556 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome P450 3D structures

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