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Information on EC - sucrose-1,6-alpha-glucan 3(6)-alpha-glucosyltransferase

for references in articles please use BRENDA:EC2.4.1.125
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IUBMB Comments
The enzyme was characterized from the dental caries bacterium Streptococcus mutans. It transfers glucosyl residues from sucrose to either the 6- or the 3-positions of glucose residues in glucans, producing a highly-branched extracellular D-glucan polymers that promote attachment of the bacteria to teeth. Three types of the enzyme have been described; the insoluble polymers produced by GTF-I and GTF-SI contain 85% alpha(1->3) bonds and 15% alpha(1->6) bonds, while the soluble polymers produced by GTF-S contain only 30% of alpha(1->3) bonds and 70% alpha(1->6) bonds. cf. EC, dextransucrase .
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The expected taxonomic range for this enzyme is: Streptococcus
gtf-s, more
sucrose + [(1->6)-alpha-D-glucosyl]n = D-fructose + (1->3)-alpha-D-glucosyl-[(1->6)-alpha-D-glucosyl]n
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sucrose + [(1->6)-alpha-D-glucosyl]n = D-fructose + [(1->6)-alpha-D-glucosyl]n+1
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