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Your query returned 3 entries. 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 | ||||||||
References: |
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EC | 2.4.1.286 | ||||||||
Accepted name: | chalcone 4′-O-glucosyltransferase | ||||||||
Reaction: | (1) UDP-α-D-glucose + naringenin chalcone = UDP + 2′,4,4′,6′-tetrahydroxychalcone 4′-O-β-D-glucoside (2) UDP-α-D-glucose + 2′,3,4,4′,6′-pentahydroxychalcone = UDP + 2′,3,4,4′,6′-pentahydroxychalcone 4′-O-β-D-glucoside |
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For diagram of aureusidin biosynthesis, click here | |||||||||
Glossary: | naringenin chalcone = 2′,4,4′,6′-tetrahydroxychalcone = 3-(4-hydroxyphemyl)-1-(2,4,6-trihydroxyphenyl)prop-2-en-1-one |
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Other name(s): | 4′CGT | ||||||||
Systematic name: | UDP-α-D-glucose:2′,4,4′,6′-tetrahydroxychalcone 4′-O-β-D-glucosyltransferase | ||||||||
Comments: | Isolated from the plant Antirrhinum majus (snapdragon). Involved in the biosynthesis of aurones, plant flavonoids that provide yellow color to the flowers. | ||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||
References: |
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EC | 2.5.1.136 | ||||||||
Accepted name: | 2-acylphloroglucinol 4-prenyltransferase | ||||||||
Reaction: | prenyl diphosphate + a 2-acylphloroglucinol = diphosphate + a 2-acyl-4-prenylphloroglucinol | ||||||||
Glossary: | naringenin chalcone = 2′,4,4′,6′-tetrahydroxychalcone = 3-(4-hydroxyphenyl)-1-(2,4,6-trihydroxyphenyl)prop-2-en-1-one phlorisovalerophenone = 3-methyl-1-(2,4,6-trihydroxyphenyl)butan-1-one |
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Other name(s): | PT-1 (gene name); PT1L (gene name); aromatic prenyltransferase (ambiguous); dimethylallyl-diphosphate:2-acylphloroglucinol 4-dimethylallyltransferase | ||||||||
Systematic name: | prenyl-diphosphate:2-acylphloroglucinol 4-prenyltransferase | ||||||||
Comments: | The enzyme, characterized from hop (Humulus lupulus), acts on phlorisovalerophenone, phlormethylbutanophenone, and phlorisobutanophenone during the synthesis of bitter acids. It also acts with much lower activity on naringenin chalcone. Forms a complex with EC 2.5.1.137, 2-acyl-4-prenylphloroglucinol 6-prenyltransferase, which catalyses additional prenylation reactions. Requires Mg2+. | ||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||
References: |
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