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Related Experiment Videos

Immunochemical studies on pneumococcal type 37 capsular polysaccharide.

P Z Allen1, W H Bowen

  • 1Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, NY 14642.

Molecular Immunology
|October 1, 1988
PubMed
Summary

Purified pneumococcal type 37 polysaccharide was analyzed for antibody binding. Specificity was determined to be against a sophorosyl unit, with a cross-reactive antigen found in Actinomyces species.

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Area of Science:

  • Immunochemistry
  • Microbiology
  • Carbohydrate Chemistry

Background:

  • Pneumococcal capsular polysaccharides are crucial for serotyping and vaccine development.
  • Understanding the specific antigenic determinants of Streptococcus pneumoniae serotypes is essential for accurate diagnostics and effective immunotherapies.
  • Previous characterization of type 37 polysaccharide structure and immunogenicity was limited.

Purpose of the Study:

  • To purify pneumococcal type 37 capsular polysaccharide free of contaminants.
  • To investigate the immunochemical reactivity of the purified polysaccharide with specific antibodies.
  • To determine the precise antigenic epitope recognized by anti-Pn37 antibodies.

Main Methods:

  • Affinity chromatography using various lectins and myeloma protein for polysaccharide purification.

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  • Quantitative precipitation assays to study antigen-antibody interactions.
  • Hapten inhibition studies with isomeric glucobioses to define antibody specificity.

    • Main Results:

    • Pneumococcal type 37 capsular polysaccharide was successfully purified using a multi-step affinity chromatography approach.
    • Quantitative precipitation and hapten inhibition studies identified the Glc beta(1----2)Glc (sophorosyl) unit as a key antigenic determinant for anti-Pn37 antibodies.
    • A high molecular weight, D-glucose-containing polysaccharide antigen cross-reactive with anti-Pn37 antibodies was identified in the culture medium of certain Actinomyces strains.

    Conclusions:

    • The anti-Pn37 antibody exhibits specificity towards the sophorosyl (Glc beta(1----2)Glc) moiety of the pneumococcal type 37 capsular polysaccharide.
    • The discovery of a cross-reactive antigen in Actinomyces suggests potential shared epitopes or structural similarities between bacterial polysaccharides.
    • Further investigation into the Actinomyces antigen could have implications for understanding microbial cross-reactivity and developing broader diagnostic tools.