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The streptococcal M protein: a highly versatile molecule

Pierre R Smeesters1, David J McMillan, Kadaba S Sriprakash

  • 1Bacterial Pathogenesis Laboratory, Queensland Institute of Medical Research, Brisbane 4029, Queensland, Australia. psmeeste@ulb.ac.be

Trends in Microbiology
|March 30, 2010
PubMed

Insights

Group A Streptococcus M-protein interactions with host targets aid immune evasion. However, M-protein structure and function are less conserved than previously believed, requiring further research.

Area of Science:

  • Microbiology
  • Immunology
  • Structural Biology

Background:

  • Group A Streptococcus (GAS) utilizes M-protein to interact with host molecules, facilitating immune evasion.
  • Existing knowledge on M-protein structure and function is derived from a limited number of GAS types.
  • Epidemiological and clinical data suggest significant variability in M-protein structure and function across GAS strains.

Purpose of the Study:

  • To review known interactions between GAS M-proteins and host ligand proteins.
  • To highlight the fragmented understanding of M-protein structure-function relationships.
  • To emphasize the need for a more comprehensive view of M-protein diversity.

Main Methods:

  • Literature review of epidemiological, clinical, and biological reports.
  • Analysis of published data on M-protein-host ligand interactions.
  • Synthesis of information on M-protein diversity and function.

Main Results:

  • M-protein's diverse interactions with host proteins are crucial for GAS immune evasion.
  • Significant structural and functional heterogeneity exists within M-proteins across different GAS types.
  • Current understanding of M-protein is incomplete due to a focus on a narrow range of types.

Conclusions:

  • The M-protein, while extensively studied, exhibits less conserved structure and function than previously assumed.
  • A broader investigation into M-protein diversity is necessary for a complete understanding of GAS pathogenesis.
  • Future research should address the fragmented knowledge base regarding M-protein interactions and host immune evasion strategies.

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