Galactinol-raffinose galactosyltransferase

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

alpha-D-galactosyl-(1->3)-1D-myo-inositol + raffinose $\rightleftharpoons$ myo-inositol + stachyose

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

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. This enzyme participates in galactose metabolism.

[edit] References

IUBMB entry for 2.4.1.67
BRENDA references for 2.4.1.67 (Recommended.)
PubMed references for 2.4.1.67
PubMed Central references for 2.4.1.67
Google Scholar references for 2.4.1.67
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: 233–9. 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: 103–10. PMID 4774118.
Preiss, J. (Ed.), The Biochemistry of Plant, vol. 3, Academic Press, New York, 1980, p. 221-270.