Galactinol—raffinose galactosyltransferase

In enzymology, a galactinol-raffinose galactosyltransferase (EC 2.4.1.67) is an enzyme that catalyzes the chemical reaction

galactinol-raffinose galactosyltransferase
Identifiers
EC no.2.4.1.67
CAS no.37277-70-6
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins
alpha-D-galactosyl-(1→3)-1D-myo-inositol + raffinose myo-inositol + stachyose

Thus, the two substrates of this enzyme are α-D-galactosyl-(1→3)-1D-myo-inositol and raffinose, whereas its two products are myo-inositol and stachyose.

This enzyme participates in galactose metabolism.

Nomenclature

edit

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is alpha-D-galactosyl-(1→3)-myo-inositol:raffinose galactosyltransferase. Other names in common use include galactinol-raffinose galactosyltransferase, and stachyose synthetase.

References

edit
  • Tanner W (1967). "Die Biosynthese der Stachyose". Ber. Dtsch. Bot. Ges. 80: 111.
  • Tanner W, Kandler O (1968). "Myo-inositol, a cofactor in the biosynthesis of stachyose". Eur. J. Biochem. 4 (2): 233–9. doi:10.1111/j.1432-1033.1968.tb00199.x. PMID 5655499.
  • Lehle L, Tanner W (1973). "The function of myo-inositol in the biosynthesis of raffinose Purification and characterization of galactinol:sucrose 6-galactosyltransferase from Vicia faba seeds". Eur. J. Biochem. 38 (1): 103–10. doi:10.1111/j.1432-1033.1973.tb03039.x. PMID 4774118.
  • Preiss, J. (Ed.), The Biochemistry of Plants, vol. 3, Academic Press, New York, 1980, p. 221-270.