IUBMB Enzyme Nomenclature


Accepted name: rhamnogalacturonan I rhamnosyltransferase

Reaction: UDP-β-L-rhamnose + α-D-galacturonosyl-[(1→2)-α-L-rhamnosyl-(1→4)-α-D-galacturonosyl]n = UDP + [(1→2)-α-L-rhamnosyl-(1→4)-α-D-galacturonosyl]n+1

Other name(s): RRT; RG I rhamnosyltransferase

Systematic name: UDP-β-L-rhamnose:rhamnogalacturonan I 4-rhamnosyltransferase (configuration-inverting)

Comments: The enzyme, characterized from Vigna angularis (azuki beans), participates in the biosynthesis of rhamnogalacturonan type I. It does not require any metal ions, and prefers substrates with a degree of polymerization larger than 7.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Uehara, Y., Tamura, S., Maki, Y., Yagyu, K., Mizoguchi, T., Tamiaki, H., Imai, T., Ishii, T., Ohashi, T., Fujiyama, K. and Ishimizu, T. Biochemical characterization of rhamnosyltransferase involved in biosynthesis of pectic rhamnogalacturonan I in plant cell wall. Biochem. Biophys. Res. Commun. 486 (2017) 130-136. [PMID: 28283389]

[EC created 2018]

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