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J Bacteriol. 1969 May; 98(2): 341-346
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Dextran-induced Agglutination of Streptococcus mutans, and Its Potential Role in the Formation of Microbial Dental Plaques

R. J. Gibbons1 and R. J. Fitzgerald2

1 Forsyth Dental Center, Boston, Massachusetts 02115
2 National Institute of Dental Research, Bethesda, Maryland 20014

ABSTRACT

Glucose-grown washed cells of streptococci similar to Streptococcus mutans, which contain cell-bound dextransucrase, have been observed to agglutinate upon the addition of high molecular weight dextran. Low molecular weight dextran or unrelated polysaccharides were ineffective. Agglutination also occurred upon addition of sucrose, which can be converted into dextran, but not with other mono- and disaccharides. Other bacteria, including species capable of synthesizing dextrans, were not observed to exhibit this phenomenon. Cells of S. mutans agglutinated upon addition of dextran over a wide pH range, but maximal sensitivity to dextran occurred at pH 8.5. At this pH, such cells can be used for a simple, specific, and exquisitely sensitive qualitative assay for high molecular weight dextran, for addition of 6 ng of dextran with a molecular weight of 2 x 106 (i.e., approximately three molecules per cell) caused detectable agglutination. High concentrations of glucose, levan, and dextran of molecular weight of 2 x 104 inhibited the reaction. Fluorescein-labeled cells of S. mutans were observed to adhere to dextran-containing plaques and dextran-treated teeth, suggesting that this phenomenon may be of importance in the formation of streptococcal dental plaques. The mechanism responsible for dextraninduced agglutination appears to involve the affinity of a receptor site, possibly dextransucrase, on the surface of several cells for common dextran molecules.

J Bacteriol. 1969 May; 98(2): 341-346
Copyright © 1969 American Society for Microbiology. All Rights Reserved.



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