IUBMB Enzyme Nomenclature


Accepted name: UTP-monosaccharide-1-phosphate uridylyltransferase

Reaction: UTP + a monosaccharide 1-phosphate = diphosphate + UDP-monosaccharide

Glossary: UDP-Xyl = UDP-α-D-xylose
UDP-L-Ara = UDP-β-L-arabinopyranose

Other name(s): UDP-sugar pyrophosphorylase; PsUSP

Comments: Requires Mg2+ or Mn2+ for maximal activity. The reaction can occur in either direction and it has been postulated that MgUTP and Mg-diphosphate are the actual substrates [1,2]. The enzyme catalyses the formation of UDP-Glc, UDP-Gal, UDP-GlcA, UDP-L-Ara and UDP-Xyl, showing broad substrate specificity towards monosaccharide 1-phosphates. Mannose 1-phosphate, L-fucose 1-phosphate and glucose 6-phosphate are not substrates and UTP cannot be replaced by other nucleotide triphosphates [1].

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


1. Kotake, T., Yamaguchi, D., Ohzono, H., Hojo, S., Kaneko, S., Ishida, H.K. and Tsumuraya, Y. UDP-sugar pyrophosphorylase with broad substrate specificity toward various monosaccharide 1-phosphates from pea sprouts. J. Biol. Chem. 279 (2004) 45728-45736. [PMID: 15326166]

2. Rudick, V.L. and Weisman, R.A. Uridine diphosphate glucose pyrophosphorylase of Acanthamoeba castellanii. Purification, kinetic, and developmental studies. J. Biol. Chem. 249 (1974) 7832-7840. [PMID: 4430676]

[EC created 2006]

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