title: Inhibition of Streptococcus mutans glucosyltransferase by M-GTFI, a new inhibitor.
abstract: Two hundred strains of soil microorganisms were screened for the production of inhibitors of the glucosyltransferase activity of Streptococcus mutans strain, K1-R. The strain producing the greatest amount of inhibitor was one recently isolated in our laboratory. It has now been identified as a strain of Micromonospora narashinoensis on the basis of morphological and physiological studies. The inhibitor, M-GTFI, affects the glucosyltransferase that produces the water-insoluble glucan rather than that which produces the water-soluble glucan. Fuchsin-sulphite staining of the inhibitor after its purification by polyacrylamide gel electrophoresis indicates that it is probably an acidic substance. It had Mr 5700 as was determined by gel filtration. From an examination of the effects of this inhibitor on representative strains of S. mutans other than K1-R, there is a suggestion of a similar selectivity for the water-insoluble glucan-forming activity in other strains.
authors.affiliation: Laboratory of Medicinal Microbiology, Faculty of Pharmaceutical Sciences, Kumamoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Uyeda
authors.forename: S
authors.initials: S
authors.lastname: Yamane
authors.forename: A
authors.initials: A
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Shibata
mesh_terms: D003731:Dental Caries / Q000382:microbiology; D004791:Enzyme Inhibitors; D005964:Glucosyltransferases / Q000037:antagonists & inhibitors* / Q000302:isolation & purification / Q000494:pharmacology; D006801:Humans; D007700:Kinetics; D009930:Organic Chemicals; D013295:Streptococcus mutans / Q000201:enzymology*
chemical_list: D004791:Enzyme Inhibitors; D009930:Organic Chemicals; C058961:micromonospora glucosyl transferase inhibitor; D005964:Glucosyltransferases