Galactinol-raffinose galactosyltransferase () is an enzyme that catalyzes the chemical reaction
The two substrates of this enzyme are galactinol and raffinose. Its products are inositol (myo-inositol) and the tetrasaccharide, stachyose. The enzyme has been characterised from Vicia faba.
This enzyme participates in galactose metabolism.Preiss, J. (Ed.), The Biochemistry of Plants, vol. 3, Academic Press, New York, 1980, p. 221-270
Nomenclature 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.
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