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. 1978 Dec;22(3):665–671. doi: 10.1128/iai.22.3.665-671.1978

Selective Binding of Blood Group-Reactive Salivary Mucins by Streptococcus mutans and Other Oral Organisms

R J Gibbons 1, J V Qureshi 1
PMCID: PMC422211  PMID: 310426

Abstract

Strains of Streptococcus mutans of four genetic groups and five serotypes, and strains of S. sanguis, S. mitis, S. salivarius, Actinomyces naeslundii, and A. viscosus, were found to bind blood group-reactive (BGR) mucin isolated from whole human saliva. The bacteria studied bound mucins with blood type A or B reactivity to a similar extent, suggesting that the carbohydrate moieties responsible for the A and B antigenic determinants were not involved. The organisms studied appeared to bind different fractions of BGR mucin molecules because preparations absorbed with cells of a given oral species no longer contained BGR molecules which bound to homologous organisms but still possessed BGR components which bound to varying degrees to other bacteria. Differences were even noted among S. mutans strains belonging to different genetic groups and serological types. Immunoglobulins could not be detected in the mucin preparations, and addition of anti-human immunoglobulin A (IgA), IgG, or IgM serum to reaction mixtures did not affect binding. Mucin pretreated with periodate or iodoacetate no longer bound to S. mutans H12 cells, suggesting that carbohydrate moieties and sulfhydryl groups played an essential role. Active cell metabolism was not required for BGR mucin binding; however, pretreatment of H12 cells with periodate or heat (100°C for 15 min) reduced binding. Mucin labeled with [14C]phenyl isothiocyanate appeared to bind to S. mutans H12 cells comparably to untreated mucin; the binding also appeared to be specific because less than 15% of the labeled material became bound when incubated with an excess of streptococci. Binding of [14C]phenyl isothiocyanate-labeled mucin was not affected by neutral sugars tested or by preparations of c antigen, glycerol teichoic acid, dextran, or crude glucosyltransferase. However, binding was inhibited by several amines. BGR salivary mucins are present in the acquired pellicle covering teeth; the ability of bacteria to selectively bind such components suggest that they may serve as receptor molecules involved in the attachment of bacteria to teeth.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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