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Related Experiment Videos

Convergent evolution as a mechanism for pathogenic adaptation.

Sergey Sikora1, Alex Strongin, Adam Godzik

  • 1The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.

Trends in Microbiology
|September 13, 2005
PubMed
Summary

Pathogens can survive by mimicking human proteins. This study found bacterial proteases that precisely copy human counterparts, suggesting a new mechanism for pathogen virulence.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Pathogen survival relies on manipulating host defense pathways.
  • Virulence factors were traditionally considered pathogen-specific.
  • Emerging evidence shows pathogens use human protein homologs.

Purpose of the Study:

  • To investigate pathogens utilizing human protein homologs as virulence factors.
  • To analyze the mechanisms of bacterial proteases mimicking human counterparts.
  • To highlight the significance of distant homology in pathogen virulence.

Main Methods:

  • Comparative analysis of pathogen-derived proteins and human regulatory proteins.
  • Focus on virulence proteases and their active/binding sites.
  • Utilized tools for distant homology recognition.

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Main Results:

  • Identified bacterial proteases that mimic human protease specificity.
  • Observed significant similarities in active and/or binding sites.
  • Demonstrated a strategy where pathogens exploit host machinery.

Conclusions:

  • Pathogens can employ molecular mimicry using homologs of human proteins.
  • Bacterial proteases represent a key example of this mimicry.
  • Further discovery of such mechanisms is expected with advanced homology detection.