UTP—hexose-1-phosphate uridylyltransferase

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UTP:galactose-1-phosphate uridylyltransferase
UTP—galactose-1-phosphate uridylyltransferase homodimer, E.Coli
EC no.
CAS no.9016-11-9
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

In enzymology, an UTP—hexose-1-phosphate uridylyltransferase (EC is an enzyme that catalyzes the chemical reaction

UTP + alpha-D-galactose 1-phosphate diphosphate + UDP-galactose

Thus, the two substrates of this enzyme are UTP and alpha-D-galactose 1-phosphate, whereas its two products are diphosphate and UDP-galactose.

Enzyme family[edit]

This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases). The systematic name of this enzyme class is UTP:alpha-D-hexose-1-phosphate uridylyltransferase. Other names in common use include galactose-1-phosphate uridylyltransferase, galactose 1-phosphate uridylyltransferase, alpha-D-galactose 1-phosphate uridylyltransferase, galactose 1-phosphate uridyltransferase, UDPgalactose pyrophosphorylase, uridine diphosphate galactose pyrophosphorylase, and uridine diphosphogalactose pyrophosphorylase. This enzyme participates in galactose metabolism and nucleotide sugars metabolism.

Structural studies[edit]

As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 1GUP, 1GUQ, and 1HXP.


  • ISSELBACHER KJ (1958). "A mammalian uridinediphosphate galactose pyrophosphorylase". J. Biol. Chem. 232 (1): 429–44. PMID 13549431.
  • KALCKAR HM (1953). "The role of phosphoglycosyl compounds in the biosynthesis of nucleosides and nucleotides". Biochim. Biophys. Acta. 12 (1–2): 250–64. doi:10.1016/0006-3002(53)90144-9. PMID 13115434.
  • Lee L, Kimura A, Tochikura T (October 1979). "Purification and properties of UDP-glucose (UDP-galactose) pyrophosphorylase from Bifidobacterium bifidum". J. Biochem. Tokyo. 86 (4): 923–8. doi:10.1093/oxfordjournals.jbchem.a132624. PMID 500588.
  • Lobelle-Rich PA, Reeves RE (1983). "Separation and characterization of two UTP-utilizing hexose phosphate uridylyltransferases from Entamoeba histolytica". Mol. Biochem. Parasitol. 7 (2): 173–82. doi:10.1016/0166-6851(83)90043-9. PMID 6304512.