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Immunogenicity of ribosomes from enzymatically lysed Streptococcus pyogenes
Infection and Immunity
|February 1, 1980
Summary
Streptococcus pyogenes ribosomes offer protection against infection. Physical cell disruption yields more effective ribosomal vaccines, potentially due to bound cell wall proteins, compared to enzymatic methods.
Area of Science:
- Microbiology
- Immunology
- Biochemistry
Background:
- Streptococcus pyogenes is a significant human pathogen.
- Ribosomes are potential vaccine candidates against bacterial infections.
- Cell wall disruption methods can influence vaccine efficacy.
Purpose of the Study:
- To compare the immunoprotective effects of Streptococcus pyogenes ribosomes isolated by physical versus enzymatic cell disruption.
- To investigate the composition and antigenic properties of ribosomes obtained through different isolation methods.
Main Methods:
- Isolation of Streptococcus pyogenes ribosomes using physical (e.g., grinding) and enzymatic (e.g., lysozyme) cell wall disruption.
- Challenging immunized mice with Streptococcus pyogenes to assess protection.
- Chemical analysis (protein:RNA ratio) and immunological assays (immunodiffusion, antisera) to characterize ribosomes.
Main Results:
- Ribosomes from physically disrupted cells provided protection against homologous and heterologous M types, while enzymatically isolated ribosomes only protected against homologous types.
- Both isolation methods resulted in ribosome contamination with cell surface proteins.
- Physically isolated ribosomes had a higher protein:RNA ratio and contained more antigenic determinants, including potential cell wall components.
Conclusions:
- Physical disruption of Streptococcus pyogenes cells yields ribosomes with superior immunoprotective properties against diverse M types compared to enzymatic lysis.
- Contaminating cell wall proteins, tightly bound to ribosomes from physical disruption, may contribute to broader protective immunity.