KEGG Orthology (KO) [BR:ko00001]
09100 Metabolism
09110 Biosynthesis of other secondary metabolites
00941 Flavonoid biosynthesis
K05277 ANS; anthocyanidin synthase
Enzymes [BR:ko01000]
1. Oxidoreductases
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.20 With 2-oxoglutarate as one donor, and the other dehydrogenated
1.14.20.4 anthocyanidin synthase
K05277 ANS; anthocyanidin synthase
Saito K, Kobayashi M, Gong Z, Tanaka Y, Yamazaki M
Title
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.
anthocyanidin synthase;
leucocyanidin oxygenase;
leucocyanidin,2-oxoglutarate:oxygen oxidoreductase;
ANS (gene name)
Class
Oxidoreductases;
Acting on paired donors, with incorporation or reduction of molecular oxygen;
With 2-oxoglutarate as one donor, and the other dehydrogenated
The enzyme requires iron(II) and ascorbate. It is involved in the pathway by which many flowering plants make anthocyanin flower pigments (glycosylated anthocyandins). The enzyme hydroxylates the C-3 carbon, followed by a trans diaxial elimination, forming a C-2,C-3 enol. The product loses a second water molecule to form anthocyanidins. When assayed in vitro, non-enzymic epimerization of the product can lead to formation of dihydroflavanols. Thus when the substrate is leucocyanidin, a mixture of (+)-taxifolin and (+)-epitaxifolin are formed. The enzyme can also oxidize the formed (+)-taxifolin to quercetin (cf. EC 1.14.20.6, flavonol synthase) [2,3].
History
EC 1.14.20.4 created 2001 as EC 1.14.11.19, transferred 2018 to EC 1.14.20.4
Saito K, Kobayashi M, Gong Z, Tanaka Y, Yamazaki M
Title
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.
Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.20 With 2-oxoglutarate as one donor, and the other dehydrogenated
1.14.20.4
R05036 Cyanidin + Succinate + CO2 + 2 H2O <=> Leucocyanidin + 2-Oxoglutarate + Oxygen + H+
IUBMB reaction hierarchy [BR:br08202]
1. Oxidoreductase reactions
1.14.20.4
R11993 (2R,3S,4S)-Leucoanthocyanidin <=> Anthocyanidin with a 3-hydroxy group
R05036 Leucocyanidin <=> Cyanidin