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1.21.3.6: aureusidin synthase

This is an abbreviated version!
For detailed information about aureusidin synthase, go to the full flat file.

Word Map on EC 1.21.3.6

Reaction

2',3,4,4',6'-pentahydroxychalcone 4'-O-beta-D-glucoside
+
1/2 O2
=
aureusidin 6-O-beta-D-glucoside
+
H2O

Synonyms

AmAS1, AS1, aureusidin synthase, aurone synthase, More, synthase, aureusidin

ECTree

     1 Oxidoreductases
         1.21 Catalysing the reaction X-H + Y-H = X-Y
             1.21.3 With oxygen as acceptor
                1.21.3.6 aureusidin synthase

Systematic Name

Systematic Name on EC 1.21.3.6 - aureusidin synthase

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SYSTEMATIC NAME
IUBMB Comments
2',4,4',6'-tetrahydroxychalcone 4'-O-beta-D-glucoside:oxygen oxidoreductase
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-beta-D-glucoside in vivo [4].