1gp5
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Flavonoids are common colorants in plants and have long-established | + | Flavonoids are common colorants in plants and have long-established biomedicinal properties. Anthocyanidin synthase (ANS), a 2-oxoglutarate iron-dependent oxygenase, catalyzes the penultimate step in the biosynthesis of the anthocyanin class of flavonoids. The crystal structure of ANS reveals a multicomponent active site containing metal, cosubstrate, and two molecules of a substrate analog (dihydroquercetin). An additional structure obtained after 30 min exposure to dioxygen is consistent with the oxidation of the dihydroquercetin to quercetin and the concomitant decarboxylation of 2-oxoglutarate to succinate. Together with in vitro studies, the crystal structures suggest a mechanism for ANS-catalyzed anthocyanidin formation from the natural leucoanthocyanidin substrates involving stereoselective C-3 hydroxylation. The structure of ANS provides a template for the ubiquitous family of plant nonhaem oxygenases for future engineering and inhibition studies. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Arabidopsis thaliana]] | [[Category: Arabidopsis thaliana]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Clifton, I | + | [[Category: Clifton, I J.]] |
| - | [[Category: Prescott, A | + | [[Category: Prescott, A G.]] |
| - | [[Category: Schofield, C | + | [[Category: Schofield, C J.]] |
| - | [[Category: Turnbull, J | + | [[Category: Turnbull, J J.]] |
| - | [[Category: Welford, R | + | [[Category: Welford, R W.D.]] |
| - | [[Category: Wilmouth, R | + | [[Category: Wilmouth, R C.]] |
[[Category: AKG]] | [[Category: AKG]] | ||
[[Category: DH2]] | [[Category: DH2]] | ||
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[[Category: flavonoid biosynthesis]] | [[Category: flavonoid biosynthesis]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:52:28 2008'' |
Revision as of 10:52, 21 February 2008
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ANTHOCYANIDIN SYNTHASE FROM ARABIDOPSIS THALIANA COMPLEXED WITH TRANS-DIHYDROQUERCETIN
Overview
Flavonoids are common colorants in plants and have long-established biomedicinal properties. Anthocyanidin synthase (ANS), a 2-oxoglutarate iron-dependent oxygenase, catalyzes the penultimate step in the biosynthesis of the anthocyanin class of flavonoids. The crystal structure of ANS reveals a multicomponent active site containing metal, cosubstrate, and two molecules of a substrate analog (dihydroquercetin). An additional structure obtained after 30 min exposure to dioxygen is consistent with the oxidation of the dihydroquercetin to quercetin and the concomitant decarboxylation of 2-oxoglutarate to succinate. Together with in vitro studies, the crystal structures suggest a mechanism for ANS-catalyzed anthocyanidin formation from the natural leucoanthocyanidin substrates involving stereoselective C-3 hydroxylation. The structure of ANS provides a template for the ubiquitous family of plant nonhaem oxygenases for future engineering and inhibition studies.
About this Structure
1GP5 is a Single protein structure of sequence from Arabidopsis thaliana with , , , and as ligands. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Structure and mechanism of anthocyanidin synthase from Arabidopsis thaliana., Wilmouth RC, Turnbull JJ, Welford RW, Clifton IJ, Prescott AG, Schofield CJ, Structure. 2002 Jan;10(1):93-103. PMID:11796114
Page seeded by OCA on Thu Feb 21 12:52:28 2008
