In enzymology, a sucrose-1,6-alpha-glucan 3(6)-alpha-glucosyltransferase ( EC 2.4.1.125) is an enzyme that catalyzes the chemical reaction

sucrose + (1,6-alpha-D-glucosyl)n ${\displaystyle \rightleftharpoons }$ D-fructose + (1,6-alpha-D-glucosyl)n⁺1

Thus, the two substrates of this enzyme are sucrose and (1,6-alpha-D-glucosyl)n, whereas its two products are D-fructose and (1,6-alpha-D-glucosyl)n+1.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is sucrose:1,6-alpha-D-glucan 3(6)-alpha-D-glucosyltransferase. Other names in common use include water-soluble-glucan synthase, GTF-S, sucrose-1,6-alpha-glucan 3(6)-alpha-glucosyltransferase, sucrose:1,6-alpha-D-glucan 3-alpha- and 6-alpha-glucosyltransferase, sucrose:1,6-, 1,3-alpha-D-glucan 3-alpha- and, and 6-alpha-D-glucosyltransferase.

References

• Mukasa H, Shimamura A, Tsumori H (1982). "Purification and characterization of basic glucosyltransferase from Streptococcus mutans serotype c". Biochim. Biophys. Acta. 719 (1): 81–9. doi: 10.1016/0304-4165(82)90310-5. PMID  6216919.
• Shimamura A, Tsumori H, Mukasa H (1982). "Purification and properties of Streptococcus mutans extracellular glucosyltransferase". Biochim. Biophys. Acta. 702 (1): 72–80. doi: 10.1016/0167-4838(82)90028-0. PMID  6461359.
• Tsumori H, Shimamura A, Mukasa H (1985). "Purification and properties of extracellular glucosyltransferase synthesizing 1,6-, 1,3-alpha-D-glucan from Streptococcus mutans serotype a". J. Gen. Microbiol. 131 (12): 3347–53. doi: 10.1099/00221287-131-12-3347. PMID  2937877.