title: Purification and characterisation of the extracellular D-glucosyltransferase from serotype c Streptococcus mutans.
abstract: A simple method of purification for the extracellular D-glucosyltransferase (GTase) from a serotype c strain Streptococcus mutans was developed using chromatography on DEAE-Sephacel and CM-cellulose. The GTase had a molecular weight of 155,000 and an isoelectric point of 7.4. The enzyme converted sucrose, in the absence of dextran T-10, into a branched (1----6)-linked alpha-D-glucan having some alpha-(1----3)-linked D-glucosyl residues. The GTase was similar to GTases which have been isolated from other strains of serotype c S. mutans and which synthesise water-soluble glucans. In addition, the amino acid composition of the GTase protein was relatively similar to those of the GTases from serotype g S. mutans which synthesise water-soluble and water-insoluble glucans.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D005964:Glucosyltransferases / Q000302:isolation & purification* / Q000378:metabolism; D007700:Kinetics; D008970:Molecular Weight; D013295:Streptococcus mutans / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D000596:Amino Acids; D005964:Glucosyltransferases