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Updated: Jul 12, 2026

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
Published on: January 3, 2012
Structural evidence for the evolution of pyrogenic toxin superantigens
D T Mitchell1, D G Levitt, P M Schlievert
1Department of Biochemistry, University of Minnesota Medical School, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
Pathogenic bacteria like Staphylococcus aureus and Streptococcus pyogenes produce pyrogenic toxin superantigens (PTSAgs). These toxins share structural similarities, suggesting an evolution through recombination of smaller motifs.
Area of Science:
- Microbiology
- Structural Biology
- Immunology
Background:
- Pathogenic bacteria utilize diverse toxins to infect hosts.
- Staphylococcus aureus and Streptococcus pyogenes produce pyrogenic toxin superantigens (PTSAgs).
- PTSAgs are linked to illnesses like toxic shock syndrome and immune disorders.
Purpose of the Study:
- To investigate the structural characteristics of pyrogenic toxin superantigens (PTSAgs).
- To understand the evolutionary origins of PTSAgs based on structural homology.
Main Methods:
- Comparative analysis of tertiary structures of PTSAg domains.
- Examination of structural similarities with known bacterial proteins.
Main Results:
- PTSAgs exhibit a conserved two-domain tertiary fold.
- Domain 1 shows similarity to immunoglobulin binding motifs (Streptococcal proteins G and L).
- Domain 2 resembles the oligosaccharide/oligonucleotide binding fold family.
Conclusions:
- The conserved structure of PTSAgs suggests functional importance.
- Structural homology implies PTSAgs evolved via recombination of smaller beta-strand motifs.
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