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. 1973 Aug;8(2):190–198. doi: 10.1128/iai.8.2.190-198.1973

Extraction, Purification, and Chemical and Immunological Properties of the Streptococcus mutans Group “a” Polysaccharide Cell Wall Antigen

Hidehiko Mukasa 1, Hutton D Slade 1
PMCID: PMC422832  PMID: 4199154

Abstract

An antigen of Streptococcus mutans has been extracted from HS6 (group “a”) whole cells and repeatedly fractionated by Sephadex chromatography. The antigen is shown to be a polysaccharide and contains the S. mutans group “a” antigenic site and also a second antigenic site which is common to “a” strains and 2 of 3 group “d” strains. Immunological electrophoretic and chromatographic data indicate that the two sites exist in a single molecule. The polysaccharide has a molecular weight of 107,000 and is composed of glucose, galactose, glucosamine, and galactosamine. No significant quantities of lipid, phosphorus, glycerol, or ribitol are present. Immunological specificity of the group “a” polysaccharide site depends primarily on a d-glucose · d-glucose sequence, the “a-d” site on a terminal d-galactose. Water at 100 C and pepsin (pH 2.5) at room temperature are very effective in extracting the polysaccharide from lyophilized S. mutans cells. Trypsin and lysozyme are less effective. The antigen-antibody combining site appears to be located at the cell wall surface. A small quantity of enzyme-resistant protein (5%) is firmly linked to the antigen and is considered to be a remnant of a protein to which the polysaccharide is attached in the cell wall. The composition of the protein does not identify it as a part of the peptidoglycan. No reaction to the purified polysaccharide is obtained with antisera specific for teichoic acid glycerophosphate polymers from streptococci, staphylococci, or lactobacilli.

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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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