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Infect Immun. 1973 October; 8(4): 555-562
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Mechanism of Adherence of Streptococcus mutans to Smooth Surfaces I. Roles of Insoluble Dextran-Levan Synthetase Enzymes and Cell Wall Polysaccharide Antigen in Plaque Formation

Hidehiko Mukasa and Hutton D. Slade

1 Department of Microbiology, Northwestern University Medical and Dental Schools, Chicago, Illinois 60611

ABSTRACT

The mechanism of adherence of Streptococcus mutans to smooth glass surfaces has been studied. The results with both viable and heat-killed cells showed that the process required (i) the synthesis of a water-insoluble dextran-levan polymer by cell-bound enzymes and (ii) the participation of a binding site on the surface of the S. mutans cell. Synthesis of the polymer from sucrose in the presence of the cells was required for adherence, and indicates that an "active" form of the polymer was required. Polymer synthesized by cell-free S. mutans enzymes when added to S. mutans cells did not produce adherence. Purified antibody globulin, specific for the a-d site in the polysaccharide S. mutans group a antigen, completely inhibited adherence. Antibody to the second antigen present in the polysaccharide molecule, the a antigen, did not inhibit adherence. The evidence indicates that adherence did not require an antigenic binding site which might be common to all S. mutans strains. The orientation of the synthetase enzyme(s), antigenic binding site, and dextran-levan polymer on the cell surface is under study.

Infect Immun. 1973 October; 8(4): 555-562
Copyright © 1973 American Society for Microbiology. All Rights Reserved.



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