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]
See diagram for reaction with 7-O-glucosides of naringenin or apigenin or luteolin.
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]