Activating Compound | Comment | Organism | Structure |
---|---|---|---|
H2O2 | absolutely required | Antirrhinum majus | |
H2O2 | activates oxidation of 2',4,4',6'-tetrahydroxychalcone | Antirrhinum majus | |
H2O2 | optimal at 5 mM | Antirrhinum majus |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
H2O2 | inhibits oxidation of 2',3,4,4',6'-pentahydroxychalcone | Antirrhinum majus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
2',3,4,4',6'-pentahydroxychalcone + 1/2 O2 | Antirrhinum majus | - |
aureusidin + bracteatin + H2O | - |
ir | |
2',4,4',6'-tetrahydroxychalcone + O2 | Antirrhinum majus | key intermediate in the general flonoid metabolism | aureusidin + H2O | - |
ir | |
additional information | Antirrhinum majus | enzyme plays a key role in the yellow coloration of flowers, enzyme is a homologue of plant polyphenol oxidase | ? | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Antirrhinum majus | - |
snapdragon | - |
Antirrhinum majus | - |
cv. Yellow Butterfly | - |
Purification (Comment) | Organism |
---|---|
to homogeneity | Antirrhinum majus |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
2',3,4,4',6'-pentahydroxychalcone 4'-O-beta-D-glucoside + 1/2 O2 = aureusidin 6-O-beta-D-glucoside + H2O | mechanism | Antirrhinum majus | |
2',4,4',6'-tetrahydroxychalcone 4'-O-beta-D-glucoside + O2 = aureusidin 6-O-beta-D-glucoside + H2O | mechanism | Antirrhinum majus |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
flower | - |
Antirrhinum majus | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
2',3,4,4',6'-pentahydroxychalcone + 1/2 O2 | - |
Antirrhinum majus | aureusidin + bracteatin + H2O | - |
ir | |
2',3,4,4',6'-pentahydroxychalcone + O2 | best substrate | Antirrhinum majus | aureusidin + bracteatin + H2O | products are formed in a 6:1 ratio | ir | |
2',3,4,4',6'-pentahydroxychalcone + O2 | 2-6fold higher activity than with 2',4,4',6'-tetrahydroxychalcone | Antirrhinum majus | aureusidin + bracteatin + H2O | products are formed in a 6:1 ratio | ir | |
2',3,4,4',6'-pentahydroxychalcone 4'-beta-D-glucopyranoside + O2 | - |
Antirrhinum majus | aureusidin 6-beta-D-glucopyranoside + bracteatin 6-beta-D-glucopyranoside + H2O | products provide the yellow colour of flowers | ir | |
2',4,4',6'-tetrahydroxychalcone + O2 | no formation of 2-(alpha-hydroxybenzyl)coumaranone intermediate | Antirrhinum majus | aureusidin + H2O | - |
ir | |
2',4,4',6'-tetrahydroxychalcone + O2 | key intermediate in the general flonoid metabolism | Antirrhinum majus | aureusidin + H2O | - |
ir | |
2',4,4',6'-tetrahydroxychalcone 4'-beta-D-glucopyranoside + O2 | - |
Antirrhinum majus | aureusidin 6-beta-D-glucopyranoside + H2O | - |
ir | |
additional information | enzyme plays a key role in the yellow coloration of flowers, enzyme is a homologue of plant polyphenol oxidase | Antirrhinum majus | ? | - |
? |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
30 | - |
assay at | Antirrhinum majus |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
additional information | - |
at pH values above pH 7.0, 2',4,4',6'-tetrahydroxychalcone undergoes a very rapid isomerization to the inactive naringenin | Antirrhinum majus |
5.4 | - |
3-hydroxylation and cyclization of 2',4,4',6'-tetrahydroxychalcone | Antirrhinum majus |