title: Purification of a fourth glucosyltransferase from Streptococcus sobrinus.
abstract: Recently, we found a novel primer-independent, water-soluble glucan synthase as a fourth glucosyltransferase (GTF) in a culture supernatant of strain AHT-k of Streptococcus sobrinus (Y. Yamashita, N. Hanada, and T. Takehara, Biochem. Biophys. Res. Commun. 150:687-693, 1988). In the present study, four kinds of purified GTFs, including the novel GTF, were prepared. They were composed of two primer-dependent GTFs and two primer-independent GTFs. Of the primer-dependent GTFs, one was a water-insoluble glucan synthase and the other was a water-soluble glucan synthase; both of the primer-independent GTFs were water-soluble glucan synthases (GTF-Sis). Using antisera against four purified GTFs, we concluded that the immunological properties of each were completely different from those of the others. Additionally, it was shown that the novel GTF-Si, which was previously shown to have a molecular weight of 137,000, was proteolytically degraded and could be isolated at a molecular weight of 152,000 and that Streptococcus cricetus secreted an enzyme that immunologically cross-reacted with GTF-Si. While the product of the novel GTF-Si was not an effective primer for both of the primer-dependent enzymes (water-soluble and -insoluble glucan synthases), the product of the enzyme affected the molecular size of the products of the other GTF-Sis.
authors.affiliation: Department of Preventive Dentistry, Kyushu Dental College, Kitakyushu, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yamashita
authors.forename: N
authors.initials: N
authors.lastname: Hanada
authors.forename: T
authors.initials: T
authors.lastname: Takehara
mesh_terms: D002846:Chromatography, Affinity; D002848:Chromatography, DEAE-Cellulose; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D005964:Glucosyltransferases / Q000302:isolation & purification* / Q000378:metabolism; D007106:Immune Sera; D005779:Immunodiffusion; D008970:Molecular Weight; D013291:Streptococcus / Q000201:enzymology*
chemical_list: D007106:Immune Sera; D005964:Glucosyltransferases