MetaCyc Enzyme: flavanone 7-O-glucoside 2''-O-β-L-rhamnosyltransferase

Species: Citrus maxima

The rhamnosyltransferase from young pummelo leaves catalyzed the transfer of rhamnose from UDP-rhamnose to the C-2 hydroxyl group of glucose of Flavonoid-7-O-glucosides. The enzyme could not use 5-O-glucosides or aglycones as substrates.

Molecular Weight of Polypeptide: 52.0 kD (experimental) [BarPeled91]

Gene-Reaction Schematic

Gene-Reaction Schematic

Created 14-Aug-2008 by Karthikeyan AS, TAIR

Enzymatic reaction of: flavanone 7-O-glucoside 2''-O-β-L-rhamnosyltransferase

Inferred from experiment

Synonyms: UDP-rhamnose:flavanone-7-O-glucoside-2''-O-rhamnosyltransferase

apigenin 7-O-β-D-glucoside + UDP-β-L-rhamnose → apigenin 7-O-neohesperidoside + UDP + H+

The direction shown, i.e. which substrates are on the left and right sides, is in accordance with the Enzyme Commission system.

The reaction is favored in the direction shown.

In Pathways: apigenin glycosides biosynthesis

Kinetic Parameters:
Substrate Km (μM)
UDP-β-L-rhamnose 1.3


BarPeled91: Bar-Peled M, Lewinsohn E, Fluhr R, Gressel J (1991). "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(31);20953-9. PMID: 1939145

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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