The Enzyme Database

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EC 2.4.1.185     
Accepted name: flavanone 7-O-β-glucosyltransferase
Reaction: UDP-glucose + a flavanone = UDP + a flavanone 7-O-β-D-glucoside
For diagram of the biosynthesis of naringenin derivatives, click here
Other name(s): uridine diphosphoglucose-flavanone 7-O-glucosyltransferase; naringenin 7-O-glucosyltransferase; hesperetin 7-O-glucosyl-transferase
Systematic name: UDP-glucose:flavanone 7-O-β-D-glucosyltransferase
Comments: Naringenin and hesperetin can act as acceptors. No action on flavones or flavonols.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 125752-73-0
References:
1.  McIntosh, C.A., Latchinian, L. and Mansell, R.L. Flavanone-specific 7-O-glucosyltransferase activity in Citrus paradisi seedlings: purification and characterization. Arch. Biochem. Biophys. 282 (1990) 50–57. [DOI] [PMID: 2171434]
2.  McIntosh, C.A. and Mansell, R.L. Biosynthesis of naringin in Citrus paradisi - UDP-glucosyl-transferase activity in grapefruit seedlings. Phytochemistry 29 (1990) 1533–1538.
[EC 2.4.1.185 created 1992]
 
 
EC 2.4.1.236     
Accepted name: flavanone 7-O-glucoside 2′′-O-β-L-rhamnosyltransferase
Reaction: UDP-β-L-rhamnose + a flavanone 7-O-β-D-glucoside = UDP + a flavanone 7-O-[α-L-rhamnosyl-(1→2)-β-D-glucoside]
For diagram of apigenin derivatives biosynthesis, click here, for diagram of luteolin derivatives biosynthesis, click here and for diagram of naringenin derivatives biosynthesis, click here
Glossary: UDP-β-L-rhamnose = UDP-6-deoxy-β-L-mannose
Other name(s): UDP-rhamnose:flavanone-7-O-glucoside-2′′-O-rhamnosyltransferase; 1→2 UDP-rhamnosyltransferase; UDP-L-rhamnose:flavanone-7-O-glucoside 2′′-O-β-L-rhamnosyltransferase
Systematic name: UDP-β-L-rhamnose:flavanone-7-O-glucoside 2′′-O-α-L-rhamnosyltransferase
Comments: Acts on the 7-O-glucoside of naringenin and hesperetin, also the flavone 7-O-glucosides of luteolin and apigenin.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 125752-89-8
References:
1.  Bar-Peled, M., Lewinsohn, E., Fluhr, R. and Gressel, J. UDP-rhamnose:flavanone-7-O-glucoside-2′′-O-rhamnosyltransferase. Purification and characterization of an enzyme catalyzing the production of bitter compounds in citrus. J. Biol. Chem. 266 (1991) 20953–20959. [PMID: 1939145]
[EC 2.4.1.236 created 2004]
 
 
EC 3.2.1.168     
Accepted name: hesperidin 6-O-α-L-rhamnosyl-β-D-glucosidase
Reaction: hesperidin + H2O = hesperetin + rutinose
Glossary: hesperetin = 5,7,3′-trihydroxy-4′-methoxyflavanone
hesperidin = hesperetin 7-(6-O-α-L-rhamnopyranosyl-β-D-glucopyranoside)
rutinose = 6-O-α-L-rhamnopyranosyl-D-glucose
Systematic name: hesperetin 7-(6-O-α-L-rhamnopyranosyl-β-D-glucopyranoside) 6-O-α-rhamnopyranosyl-β-glucohydrolase
Comments: The enzyme exhibits high specificity towards 7-O-linked flavonoid β-rutinosides.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Mazzaferro, L., Piñuel, L., Minig, M. and Breccia, J.D. Extracellular monoenzyme deglycosylation system of 7-O-linked flavonoid β-rutinosides and its disaccharide transglycosylation activity from Stilbella fimetaria. Arch. Microbiol. 192 (2010) 383–393. [DOI] [PMID: 20358178]
2.  Mazzaferro, L., Piñuel, L., Minig, M. and Breccia, J.D. Erratum to: Extracellular monoenzyme deglycosylation system of 7-O-linked flavonoid β-rutinosides and its disaccharide transglycosylation activity from Stilbella fimetaria. Arch. Microbiol. 193 (2011) 461.
[EC 3.2.1.168 created 2011]
 
 


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