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1zgd

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{{STRUCTURE_1zgd| PDB=1zgd | SCENE= }}
{{STRUCTURE_1zgd| PDB=1zgd | SCENE= }}
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'''Chalcone Reductase Complexed With NADP+ at 1.7 Angstrom Resolution'''
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===Chalcone Reductase Complexed With NADP+ at 1.7 Angstrom Resolution===
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==Overview==
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4,2',4',6'-Tetrahydroxychalcone (chalcone) and 4,2',4'-trihydroxychalcone (deoxychalcone) serve as precursors of ecologically important flavonoids and isoflavonoids. Deoxychalcone formation depends on chalcone synthase and chalcone reductase; however, the identity of the chalcone reductase substrate out of the possible substrates formed during the multistep reaction catalyzed by chalcone synthase remains experimentally elusive. We report here the three-dimensional structure of alfalfa chalcone reductase bound to the NADP+ cofactor and propose the identity and binding mode of its substrate, namely the non-aromatized coumaryl-trione intermediate of the chalcone synthase-catalyzed cyclization of the fully extended coumaryl-tetraketide thioester intermediate. In the absence of a ternary complex, the quality of the refined NADP+-bound chalcone reductase structure serves as a template for computer-assisted docking to evaluate the likelihood of possible substrates. Interestingly, chalcone reductase adopts the three-dimensional structure of the aldo/keto reductase superfamily. The aldo/keto reductase fold is structurally distinct from all known ketoreductases of fatty acid biosynthesis, which instead belong to the short-chain dehydrogenase/reductase superfamily. The results presented here provide structural support for convergent functional evolution of these two ketoreductases that share similar roles in the biosynthesis of fatty acids/polyketides. In addition, the chalcone reductase structure represents the first protein structure of a member of the aldo/ketoreductase 4 family. Therefore, the chalcone reductase structure serves as a template for the homology modeling of other aldo/keto-reductase 4 family members, including the reductase involved in morphine biosynthesis, namely codeinone reductase.
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{{ABSTRACT_PUBMED_15970585}}
==About this Structure==
==About this Structure==
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[[Category: Isoflavonoid]]
[[Category: Isoflavonoid]]
[[Category: Polyketide]]
[[Category: Polyketide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:35:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 18:22:29 2008''

Revision as of 15:22, 27 July 2008

Image:1zgd.png

Template:STRUCTURE 1zgd

Chalcone Reductase Complexed With NADP+ at 1.7 Angstrom Resolution

Template:ABSTRACT PUBMED 15970585

About this Structure

1ZGD is a Single protein structure of sequence from Medicago sativa. Full crystallographic information is available from OCA.

Reference

Structural elucidation of chalcone reductase and implications for deoxychalcone biosynthesis., Bomati EK, Austin MB, Bowman ME, Dixon RA, Noel JP, J Biol Chem. 2005 Aug 26;280(34):30496-503. Epub 2005 Jun 21. PMID:15970585

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