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. 1982 Jul;37(1):209–215. doi: 10.1128/iai.37.1.209-215.1982

Immunochemical analysis of streptococcal group A, B, and C carbohydrates, with emphasis on group A.

J C Fung, K Wicher, M McCarty
PMCID: PMC347514  PMID: 7049950

Abstract

Streptococcal group A, B, and C carbohydrates were analyzed by counterimmunoelectrophoresis, immunoelectrophoresis, and inhibition of immunoprecipitation. Extracts of streptococci group A or C were shown by counterimmunoelectrophoresis to contain both anodic and cathodic migrating components. In immunoelectrophoresis, group A and C substances formed a continuous precipitation line stretching from the anode to the cathode, suggesting a heterogeneous population of molecules with immunochemical identity. This identity was confirmed by inhibition of immunoprecipitation, in which both anodic and cathodic immunoprecipitates were inhibited by the same constituent sugars: group A-anti-A was inhibited by N-acetylglucosamine, and group C-anti-C was inhibited by N-acetylgalactosamine. Extracts of group B showed only anodic migration in counterimmunoelectrophoresis and a narrow, anodic arc in immunoelectrophoresis. The group B-anti-B reaction was inhibited by rhamnose. Carbohydrates of variant strains of group A streptococci were also analyzed by the same methods. The results suggest that the heterogeneity of group A carbohydrate may have resulted from attachment of various amounts of N-acetylglucosamine to the polyrhamnose backbone.

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Selected References

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