1IDU image
Entry Detail
PDB ID:
1IDU
Keywords:
Title:
CRYSTAL STRUCTURE OF THE PEROXIDE FORM OF THE VANADIUM-CONTAINING CHLOROPEROXIDASE FROM CURVULARIA INAEQUALIS
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2001-04-05
Release Date:
2001-04-11
Method Details:
Experimental Method:
Resolution:
2.24 Å
R-Value Work:
0.17
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:VANADIUM CHLOROPEROXIDASE
Chain IDs:A
Chain Length:609
Number of Molecules:1
Biological Source:Curvularia inaequalis
Ligand Molecules
Primary Citation
Implications for the catalytic mechanism of the vanadium-containing enzyme chloroperoxidase from the fungus Curvularia inaequalis by X-ray structures of the native and peroxide form.
Biol.Chem. 378 309 315 (1997)
PMID: 9165086

Abstact

Implications for the catalytic mechanism of the vanadium-containing chloroperoxidase from the fungus Curvularia inaequalis have been obtained from the crystal structures of the native and peroxide forms of the enzyme. The X-ray structures have been solved by difference Fourier techniques using the atomic model of the azide chloroperoxidase complex. The 2.03 A crystal structure (R = 19.7%) of the native enzyme reveals the geometry of the intact catalytic vanadium center. The vanadium is coordinated by four non-protein oxygen atoms and one nitrogen (NE2) atom from histidine 496 in a trigonal bipyramidal fashion. Three oxygens are in the equatorial plane and the fourth oxygen and the nitrogen are at the apexes of the bipyramid. In the 2.24 A crystal structure (R = 17.7%) of the peroxide derivate the peroxide is bound to the vanadium in an eta2-fashion after the release of the apical oxygen ligand. The vanadium is coordinated also by 4 non-protein oxygen atoms and one nitrogen (NE2) from histidine 496. The coordination geometry around the vanadium is that of a distorted tetragonal pyramid with the two peroxide oxygens, one oxygen and the nitrogen in the basal plane and one oxygen in the apical position. A mechanism for the catalytic cycle has been proposed based on these X-ray structures and kinetic data.

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