2cix

chloroperoxidase complexed with cyclopentanedione

spinqualitylabelsall models 2cix, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2cix is a 1 chain structure with sequence from Caldariomyces fumago. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BMA, BR, CEJ, EDO, HEM, MAN, MN, NAG NonStd Res: PCA Related: 2civ, 2ciw, 2ciy, 2ciz, 2cj0, 2cj1, 2cj2, 1cpo, 2cpo Activity: Chloride peroxidase, with EC number 1.11.1.10 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PRXC_CALFU] Catalyzes peroxidative halogenations involved in the biosynthesis of clardariomycin (2,2-dichloro-1,3-cyclo-pentenedione). The enzyme also has potent catalase activity and in the absence of halide ion, acts as a peroxidase similar to plant peroxidases. 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 Chloroperoxidase (CPO) is a heme-thiolate enzyme that catalyzes hydrogen peroxide-dependent halogenation reactions. Structural data on substrate binding have not been available so far. CPO was therefore crystallized in the presence of iodide or bromide. One halide binding site was identified at the surface near a narrow channel that connects the surface with the heme. Two other halide binding sites were identified within and at the other end of this channel. Together, these sites suggest a pathway for access of halide anions to the active site. The structure of CPO complexed with its natural substrate cyclopentanedione was determined at a resolution of 1.8 A. This is the first example of a CPO structure with a bound organic substrate. In addition, structures of CPO bound with nitrate, acetate, and formate and of a ternary complex with dimethylsulfoxide (Me2SO) and cyanide were determined. These structures have implications for the mechanism of compound I formation. Before binding to the heme, the incoming hydrogen peroxide first interacts with Glu-183. The deprotonated Glu-183 abstracts a proton from hydrogen peroxide. The hydroperoxo-anion then binds at the heme, yielding compound 0. Glu-183 protonates the distal oxygen of compound 0, water is released, and compound I is formed. Crystal structures of chloroperoxidase with its bound substrates and complexed with formate, acetate, and nitrate.,Kuhnel K, Blankenfeldt W, Terner J, Schlichting I J Biol Chem. 2006 Aug 18;281(33):23990-8. Epub 2006 Jun 20. PMID:16790441 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Haloperoxidase

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