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1dxq

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[[Image:1dxq.gif|left|200px]]
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{{STRUCTURE_1dxq| PDB=1dxq | SCENE= }}
{{STRUCTURE_1dxq| PDB=1dxq | SCENE= }}
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'''CRYSTAL STRUCTURE OF MOUSE NAD[P]H-QUINONE OXIDOREDUCTASE'''
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===CRYSTAL STRUCTURE OF MOUSE NAD[P]H-QUINONE OXIDOREDUCTASE===
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==Overview==
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NAD(P)H/quinone acceptor oxidoreductase (QR1, NQO1, formerly DT-diaphorase; EC ) protects animal cells from the deleterious and carcinogenic effects of quinones and other electrophiles. In this paper we report the apoenzyme structures of human (at 1.7-A resolution) and mouse (2.8 A) QR1 and the complex of the human enzyme with the substrate duroquinone (2.5 A) (2,3,5, 6-tetramethyl-p-benzoquinone). In addition to providing a description and rationale of the structural and catalytic differences among several species, these structures reveal the changes that accompany substrate or cofactor (NAD) binding and release. Tyrosine-128 and the loop spanning residues 232-236 close the binding site, partially occupying the space left vacant by the departing molecule (substrate or cofactor). These changes highlight the exquisite control of access to the catalytic site that is required by the ping-pong mechanism in which, after reducing the flavin, NAD(P)(+) leaves the catalytic site and allows substrate to bind at the vacated position. In the human QR1-duroquinone structure one ring carbon is significantly closer to the flavin N5, suggesting a direct hydride transfer to this atom.
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{{ABSTRACT_PUBMED_10706635}}
==About this Structure==
==About this Structure==
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[[Category: Flavoprotein]]
[[Category: Flavoprotein]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 14:24:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:46:35 2008''

Revision as of 20:46, 30 June 2008

Image:1dxq.png

Template:STRUCTURE 1dxq

CRYSTAL STRUCTURE OF MOUSE NAD[P]H-QUINONE OXIDOREDUCTASE

Template:ABSTRACT PUBMED 10706635

About this Structure

1DXQ is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Structures of recombinant human and mouse NAD(P)H:quinone oxidoreductases: species comparison and structural changes with substrate binding and release., Faig M, Bianchet MA, Talalay P, Chen S, Winski S, Ross D, Amzel LM, Proc Natl Acad Sci U S A. 2000 Mar 28;97(7):3177-82. PMID:10706635

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