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Related Experiment Videos

Localization of surface immunogenic protein on group B streptococcus.

S Rioux1, D Martin, H W Ackermann

  • 1Unité de Recherche en Vaccinologie, Centre Hospitalier Universitaire de Québec et Université Laval, Ste-Foy, Québec, Canada G1V 4G2. Stephanie.Rioux@crchul.ulaval.ca

Infection and Immunity
|July 12, 2001
PubMed
Summary

Group B Streptococcus (GBS) surface immunogenic protein (Sip) is accessible on intact bacterial cells. Antibodies recognize Sip, which is localized to specific regions on the GBS surface.

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Area of Science:

  • Microbiology
  • Immunology
  • Cell Biology

Background:

  • Group B Streptococcus (GBS) is a significant human pathogen.
  • Understanding the surface localization of GBS proteins is crucial for vaccine development.
  • The surface immunogenic protein (Sip) is a potential target for GBS therapeutics.

Purpose of the Study:

  • To investigate the localization and accessibility of the GBS surface immunogenic protein (Sip).
  • To determine if native Sip is exposed on the surface of intact GBS cells.
  • To identify specific regions of Sip distribution on the GBS cell surface.

Main Methods:

  • Flow cytometry was used to assess Sip accessibility on intact GBS cells.
  • Immunogold electron microscopy was employed to visualize Sip localization.

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  • Antibodies generated against recombinant Sip were used for detection.

    • Main Results:

    • Antibodies against recombinant Sip effectively recognized native Sip on the surface of various GBS strains across all nine serotypes.
    • Immunogold electron microscopy confirmed Sip exposure on the intact GBS cell surface.
    • Sip distribution was found to be restricted to polar sites and the septal region of GBS cells.

    Conclusions:

    • The surface immunogenic protein (Sip) is exposed and accessible on the surface of intact Group B Streptococcus cells.
    • Sip exhibits a non-uniform distribution, preferentially localizing to specific cellular regions.
    • These findings support Sip as a potential target for immunodiagnostics and therapeutics against GBS infections.