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Group A streptococcal M proteins: virulence factors and protective antigens
1Dept of Immunology, Medical School, University of Newcastle upon Tyne, UK.
Abstract:
Rebecca Lancefield described group A streptococcal M proteins over 50 years ago, and they have remained at the forefront of investigations into streptococcal pathogenicity to the present day. As described in this review, they form cell surface fibrils with several functions, ranging from resisting phagocytosis and inducing host-crossreactive antibodies, to presenting the host immune system with an accessible protective antigen.
Insights
Group A streptococcal M proteins are key to understanding streptococcal pathogenicity. These cell surface proteins resist phagocytosis, induce antibodies, and present protective antigens to the immune system.
Area of Science:
- Microbiology
- Immunology
- Molecular Biology
Background:
- Group A streptococcal M proteins were first described by Rebecca Lancefield over 50 years ago.
- These proteins remain central to research on streptococcal pathogenicity.
Purpose of the Study:
- To review the functions and significance of group A streptococcal M proteins.
- To highlight their role in bacterial virulence and host immune interactions.
Main Methods:
- Review of existing literature on streptococcal M proteins.
- Analysis of their structural and functional properties.
Main Results:
- M proteins form cell surface fibrils on group A Streptococcus.
- These fibrils exhibit multiple functions, including resistance to phagocytosis.
- M proteins induce host-crossreactive antibodies and act as protective antigens.
Conclusions:
- Group A streptococcal M proteins are crucial virulence factors.
- Their diverse functions underscore their importance in host-pathogen interactions.
- Continued research on M proteins is vital for understanding and combating streptococcal infections.