| EC |
2.4.1.67 |
| Accepted name: |
galactinol—raffinose galactosyltransferase |
| Reaction: |
α-D-galactosyl-(1→3)-1D-myo-inositol + raffinose = myo-inositol + stachyose |
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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 2.4.1.123, inositol 3-α-galactosyltransferase. See also EC 2.4.1.82, galactinol—sucrose galactosyltransferase. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 37277-70-6 |
| References: |
| 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. |
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| [EC 2.4.1.67 created 1972, modified 2003] |
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