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Information on EC - aureusidin synthase

for references in articles please use BRENDA:EC1.21.3.6
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EC Tree
     1 Oxidoreductases
         1.21 Catalysing the reaction X-H + Y-H = X-Y
             1.21.3 With oxygen as acceptor
       aureusidin synthase
IUBMB 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 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 .
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
aureusidin synthase, amas1, more
2',3,4,4',6'-pentahydroxychalcone 4'-O-beta-D-glucoside + 1/2 O2 = aureusidin 6-O-beta-D-glucoside + H2O
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2',3,4,4',6'-pentahydroxychalcone 4'-O-beta-D-glucoside + O2 = bracteatin 6-O-beta-D-glucoside + H2O
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2',4,4',6'-tetrahydroxychalcone 4'-O-beta-D-glucoside + O2 = aureusidin 6-O-beta-D-glucoside + H2O
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