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. 1978 Mar;61(3):671–677. doi: 10.1172/JCI108979

Excretion of Lipoteichoic Acid by Group A Streptococci

INFLUENCE OF PENICILLIN ON EXCRETION AND LOSS OF ABILITY TO ADHERE TO HUMAN ORAL MUCOSAL CELLS

Michael L Alkan 1,2, Edwin H Beachey 1,2
PMCID: PMC372580  PMID: 346604

Abstract

Group A streptococci were grown in the presence of [2-3H]glycerol. Concentrated suspensions of the labeled organisms were incubated with and without penicillin. [3H]Glycerol-labeled material accumulated in the supernates in increasing amounts with increasing concentrations of penicillin, ranging from 0 to 50 U/ml. The excretion of labeled material occurred in the absence of nucleic acid synthesis or bacteriolysis indicating that the phenomenon is independent of cell multiplication or decay. The accumulation of label was paralleled by an accumulation of erythrocyte-sensitizing material measured by passive hemagglutination tests for lipoteichoic acid antigen, indicating that a portion of the labeled material possessed the properties of lipoteichoic acid. Culture supernates were fractionated by column chromatography, and the materials obtained were analyzed by electrophoresis on sodium dodecyl sulfate polyacrylamide, thin-layer chromatography, and paper chromatography. The ability of the same materials to bind to human erythrocytes and epithelial cells was tested. The culture supernate contained lipoteichoic acid, deacylated lipoteichoic acid, glycerol phosphate, and free glycerol. Penicillin caused an increase in the amounts of each of the excreted materials. Streptococci that were stimulated with penicillin to lose their lipoteichoic acid (previously shown to mediate adherence of group A streptococci) lost their ability to adhere to buccal mucosal cells, suggesting that penicillin may influence bacterial ecology by mechanisms other than killing sensitive organisms.

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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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