1idq
From Proteopedia
(New page: 200px<br /><applet load="1idq" size="450" color="white" frame="true" align="right" spinBox="true" caption="1idq, resolution 2.03Å" /> '''CRYSTAL STRUCTURE OF...) |
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| - | [[Image:1idq.gif|left|200px]]<br /><applet load="1idq" size=" | + | [[Image:1idq.gif|left|200px]]<br /><applet load="1idq" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1idq, resolution 2.03Å" /> | caption="1idq, resolution 2.03Å" /> | ||
'''CRYSTAL STRUCTURE OF NATIVE VANADIUM-CONTAINING CHLOROPEROXIDASE FROM CURVULARIA INAEQUALIS'''<br /> | '''CRYSTAL STRUCTURE OF NATIVE VANADIUM-CONTAINING CHLOROPEROXIDASE FROM CURVULARIA INAEQUALIS'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Implications for the catalytic mechanism of the vanadium-containing | + | 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. |
==About this Structure== | ==About this Structure== | ||
| - | 1IDQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Curvularia_inaequalis Curvularia inaequalis] with VO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Chloride_peroxidase Chloride peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.10 1.11.1.10] Full crystallographic information is available from [http:// | + | 1IDQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Curvularia_inaequalis Curvularia inaequalis] with <scene name='pdbligand=VO4:'>VO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Chloride_peroxidase Chloride peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.10 1.11.1.10] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IDQ OCA]. |
==Reference== | ==Reference== | ||
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[[Category: two four-helix bundles]] | [[Category: two four-helix bundles]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:10:48 2008'' |
Revision as of 11:10, 21 February 2008
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CRYSTAL STRUCTURE OF NATIVE VANADIUM-CONTAINING CHLOROPEROXIDASE FROM CURVULARIA INAEQUALIS
Overview
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.
About this Structure
1IDQ is a Single protein structure of sequence from Curvularia inaequalis with as ligand. Active as Chloride peroxidase, with EC number 1.11.1.10 Full crystallographic information is available from OCA.
Reference
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., Messerschmidt A, Prade L, Wever R, Biol Chem. 1997 Mar-Apr;378(3-4):309-15. PMID:9165086
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