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In enzymology, a galactinol-sucrose galactosyltransferase (EC 2.4.1.82) is an enzyme that catalyzes the chemical reaction

alpha-D-galactosyl-(1->3)-1D-myo-inositol + sucrose ${\displaystyle \rightleftharpoons }$ myo-inositol + raffinose

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

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:sucrose 6-alpha-D-galactosyltransferase. Other names in common use include 1-alpha-D-galactosyl-myo-inositol:sucrose, and 6-alpha-D-galactosyltransferase. This enzyme participates in galactose metabolism.

References

• 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.
• Lehle L, Tanner W, Kandler O (1970). "Myo-inositol, a cofactor in the biosynthesis of raffinose". Hoppe-Seyler's Z. Physiol. Chem. 351 (12): 1494–8. doi:10.1515/bchm2.1970.351.2.1494. PMID 5491608.

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