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Your query returned 1 entry. 
Printable version
| EC | 1.21.3.6 | ||||||||
| Accepted name: | aureusidin synthase | ||||||||
| Reaction: | (1) 2′,4,4′,6′-tetrahydroxychalcone 4′-O-β-D-glucoside + O2 = aureusidin 6-O-β-D-glucoside + H2O (2) 2′,3,4,4′,6′-pentahydroxychalcone 4′-O-β-D-glucoside + ½ O2 = aureusidin 6-O-β-D-glucoside + H2O (3) 2′,3,4,4′,6′-pentahydroxychalcone 4′-O-β-D-glucoside + O2 = bracteatin 6-O-β-D-glucoside + H2O |
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| For diagram of aureusidin biosynthesis, click here | |||||||||
| Glossary: | 2′,4,4′,6′-tetrahydroxychalcone = 3-(4-hydroxyphenyl)-1-(2,4,6-trihydroxyphenyl)prop-2-en-1-one aureusidin = 4,6-dihydroxy-2-[(3,4-dihydroxyphenyl)methylidene]benzofuran-3(2H)-one bracteatin = 4,6-dihydroxy-2-[(3,4,5-trihydroxyphenyl)methylidene]benzofuran-3(2H)-one |
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| Other name(s): | AmAS1 | ||||||||
| Systematic name: | 2′,4,4′,6′-tetrahydroxychalcone 4′-O-β-D-glucoside:oxygen oxidoreductase | ||||||||
| 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 act mainly on the 4′-O-β-D-glucoside in vivo [4]. | ||||||||
| Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 320784-48-3 | ||||||||
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