P05427 glucosyltransferase-SI(gtfC) Streptococcus mutans UA159 catalytic activity:Sucrose + ((1->6)-alpha-D-glucosyl)(n) = D-fructose + ((1->6)-alpha-D-glucosyl)(n+1).,function:Production of extracellular glucans, that are thought to play a key role in the development of the dental plaque because of their ability to adhere to smooth surfaces and mediate the aggregation of bacterial cells and food debris.,miscellaneous:GTF-I synthesizes water-insoluble glucans (alpha 1,3-linked glucose and some 1,6 linkages), GTF-S synthesizes water-soluble glucans (alpha 1,6-glucose). GTF-SI synthesizes both forms of glucans.,similarity:Belongs to the glycosyl hydrolase 70 family.,similarity:Contains 11 cell wall-binding repeats.,