IUBMB Enzyme Nomenclature


Accepted name: inositol 3-α-galactosyltransferase

Reaction: UDP-α-D-galactose + myo-inositol = UDP + O-α-D-galactosyl-(1→3)-1D-myo-inositol

For diagram of reaction click here.

Glossary: galactinol = 3-O-α-D-galactosyl-1D-myo-inositol

Other name(s): UDP-D-galactose:inositol galactosyltransferase; UDP-galactose:myo-inositol 1-α-D-galactosyltransferase; UDPgalactose:myo-inositol 1-α-D-galactosyltransferase; galactinol synthase; inositol 1-α-galactosyltransferase; uridine diphosphogalactose-inositol galactosyltransferase; GolS; UDP-galactose:myo-inositol 3-α-D-galactosyltransferase

Systematic name: UDP-α-D-galactose:myo-inositol 3-α-D-galactosyltransferase

Comments: An enzyme from plants involved in the formation of raffinose and stachyose [cf. EC (galactinol—raffinose galactosyltransferase) and EC (galactinol—sucrose galactosyltransferase)].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 79955-89-8


1. Pharr, D.M., Sox, H.N., Locy, R.D. and Huber, S.C. Partial characterization of the galactinol forming enzyme from leaves of Cucumis sativus L. Plant Sci. Lett. 23 (1981) 25-33.

[EC created 1984, modified 2003]

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