Structure and Mechanism of Anthocyanidin Synthase from Arabidopsis Thaliana.Wilmouth, R.C., Turnbull, J.J., Welford, R.W.D., Clifton, I.J., Prescott, A.G., Schofield, C.J.
(2002) Structure 10: 93
- PubMed: 11796114
- Primary Citation of Related Structures:
- PubMed Abstract:
- Direct Evidence for Anthocyanidin Synthase as a 2-Oxoglutarate-Dependent Oxygenase: Molecular Cloning and Functional Expression of Cdna from a Red Forma of Perilla Frutescens
Saito, K.,Kobayashi, M.,Gong, Z.,Tanaka, Y.,Yamazaki, M.
(1999) Plant J. 17: 181
- Are Anthocyanidins the Immediate Products of Anthocyanidin Synthase?
Turnbull, J.J.,Sobey, W.J.,Aplin, R.T.,Hassan, A.,Firmin, J.L.,Schofield, C.J.,Prescott, A.G.
(2000) Chem. Commun. --: 2473
- Purification, Crystallization and Preliminary X-Ray Diffraction of Anthocyanidin Synthase from Arabidopsis Thaliana
Turnbull, J.J.,Prescott, A.G.,Schofield, C.J.,Wilmouth, R.C.
(2001) Acta Crystallogr.,Sect.D D57: 425
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 flavo ...
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.
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