The Enzyme Database

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Accepted name: galactinol—raffinose galactosyltransferase
Reaction: α-D-galactosyl-(1→3)-1D-myo-inositol + raffinose = myo-inositol + stachyose
For diagram of stachyose biosynthesis, click here
Glossary: raffinose = β-D-fructofuranosyl α-D-galactopyranosyl-(1→6)-α-D-glucopyranoside
Other name(s): galactinol-raffinose galactosyltransferase; stachyose synthetase; α-D-galactosyl-(1→3)-myo-inositol:raffinose galactosyltransferase
Systematic name: α-D-galactosyl-(1→3)-1D-myo-inositol:raffinose galactosyltransferase
Comments: This enzyme also catalyses galactosyl transfer from stachyose to raffinose (shown by labelling) [4]. For synthesis of the substrate, see EC, inositol 3-α-galactosyltransferase. See also EC, galactinol—sucrose galactosyltransferase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 37277-70-6
1.  Tanner, W. Die Biosynthese der Stachyose. Ber. Dtsch. Bot. Ges. 80 (1967) 111.
2.  Tanner, W. and Kandler, O. Myo-inositol, a cofactor in the biosynthesis of stachyose. Eur. J. Biochem. 4 (1968) 233–239. [DOI] [PMID: 5655499]
3.  Lehle, L. and Tanner, W. 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 (1973) 103–110. [DOI] [PMID: 4774118]
4.  Kandler, O. and Hopf, H. Occurrence, metabolism and function of oligosaccharides. In: Preiss, J. (Ed.), The Biochemistry of Plant, vol. 3, Academic Press, New York, 1980, pp. 221–270.
[EC created 1972, modified 2003]

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