aureusidin synthase EC#: 1.21.3.6; ChemWhat Code: 1376083
| Product Name | aureusidin synthase |
| Example Structure |  |
| Synonyms | AmAS1, AS1, aureusidin synthase, aurone synthase, More, synthase, aureusidin |
| EC Number | 1.21.3.6 |
| CAS Registry Number | 320784-48-3 |
| Comments | A copper-containing glycoprotein that plays a key role in the yellow coloration of flowers such as Antirrhinum majus (snapdragon). The enzyme is a homologue of plant polyphenol oxidase [1] and catalyses two separate chemical transformations, i.e. 3-hydroxylation and oxidative cyclization (2′,-dehydrogenation). H2O2 activates reaction (1) but inhibits reaction (2). Originally considered to act on the phenol but now thought to mainly act on the 4′-O-¦Â-glucoside in vivo [4]. |
| Cofactor | Cu cation |
| History | |
| Reactions | (1) 2′,4,4′,6′-tetrahydroxychalcone 4′-O-beta-glucoside + O(2) = aureusidin 6-O-beta-glucoside + H(2)O. (2) 2 2′,3,4,4′,6′-pentahydroxychalcone 4′-O-beta-glucoside + O(2) = 2 aureusidin 6-O-beta-glucoside + 2 H(2)O. (3) 2′,3,4,4′,6′-pentahydroxychalcone 4′-O-beta-glucoside + O(2) = bracteatin 6-O-beta-glucoside + H(2)O. |
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