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Surface protein expression in group B streptococcal invasive isolates

P Ferrieri1, A E Flores

  • 1Department of Laboratory Medicine, University of Minnesota Medical School, Minneapolis, USA.

Advances in Experimental Medicine and Biology
|January 1, 1997
PubMed
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Group B Streptococcus (GBS) serotypes Ia, III, and V are common in early-onset disease, with specific protein expression patterns. Combining polysaccharide and protein markers offers a robust method for GBS strain characterization.

Area of Science:

  • Microbiology
  • Immunology
  • Molecular Biology

Background:

  • Group B Streptococcus (GBS) is a leading cause of early-onset neonatal infections.
  • Understanding GBS surface structure is crucial for developing effective diagnostic and prevention strategies.

Purpose of the Study:

  • To characterize GBS isolates from early-onset disease using both polysaccharide and surface protein markers.
  • To investigate the relationship between GBS serotypes and their predominant surface protein expression patterns.

Main Methods:

  • Characterization of 211 GBS isolates from early-onset disease.
  • Immuno-precipitation electrophoresis (IEP) to confirm R protein presence.
  • Polyacrylamide gel electrophoresis/Western blot (PAGE/WB) to analyze protein molecular weight forms.

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Main Results:

  • Serotypes Ia, III, and V comprised nearly 80% of isolates.
  • Distinct protein expression patterns were observed for each common serotype: alpha for Ia, R4 for III, and R1+R4 for V.
  • Alpha protein expression was mutually exclusive of R proteins.
  • Multiple molecular weight forms of R1 and strain-specific variations in R4 were confirmed.

Conclusions:

  • GBS exhibits significant cell surface complexity.
  • Utilizing both polysaccharide types and surface proteins provides an advantageous and comprehensive approach for GBS strain characterization.