EC |
2.4.1.82 |
Accepted name: |
galactinol—sucrose galactosyltransferase |
Reaction: |
α-D-galactosyl-(1→3)-1D-myo-inositol + sucrose = myo-inositol + raffinose |
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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): |
1-α-D-galactosyl-myo-inositol:sucrose 6-α-D-galactosyltransferase; α-D-galactosyl-(1→3)-myo-inositol:sucrose 6-α-D-galactosyltransferase; raffinose synthase; RafS |
Systematic name: |
α-D-galactosyl-(1→3)-1D-myo-inositol:sucrose 6-α-D-galactosyltransferase |
Comments: |
4-Nitrophenyl α-D-galactopyranoside can also act as donor. The enzyme also catalyses an exchange reaction between raffinose and sucrose (cf. EC 2.4.1.123, inositol 3-α-galactosyltransferase). |
Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 62213-45-0 |
References: |
1. |
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] |
2. |
Lehle, L., Tanner, W. and Kandler, O. Myo-inositol, a cofactor in the biosynthesis of raffinose. Hoppe-Seyler's Z. Physiol. Chem. 351 (1970) 1494–1498. [PMID: 5491608] |
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[EC 2.4.1.82 created 1976, modified 2003] |
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