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Thiol-activated cytolysins: structure, function and role in pathogenesis.

S J Billington1, B H Jost, J G Songer

  • 1Department of Veterinary Science and Microbiology, 1117 East Lowell Street, The University of Arizona, Tucson, AZ 85721, USA. sbilling@u.arizona.edu

FEMS Microbiology Letters
|January 6, 2000
PubMed
Summary
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Thiol-activated cytolysins, important in Gram-positive pathogenesis, form pores through membrane binding, insertion, and oligomerization. Research reveals thiol activation is not a key property of these toxins.

Area of Science:

  • Microbiology
  • Immunology
  • Structural Biology

Background:

  • Thiol-activated cytolysins are virulence factors in Gram-positive bacterial infections.
  • These toxins can cause subtle pathogenic effects beyond cell lysis, including immune modulation.

Purpose of the Study:

  • To elucidate the mechanism of pore formation by thiol-activated cytolysins.
  • To investigate the role of thiol activation in cytolysin function.

Main Methods:

  • Crystal structure analysis
  • Electron microscopy
  • Site-directed mutagenesis
  • Antibody binding assays

Main Results:

  • A novel mechanism for cytolysin pore formation was modeled, involving sequential steps of membrane binding, insertion, and oligomerization.

Related Experiment Videos

  • Evidence suggests that thiol activation is not a critical feature for the function of this toxin family.

    • Conclusions:

    • The mechanism of pore formation is complex, involving multiple stages of interaction with the host cell membrane.
    • Rethinking the role of thiol activation is necessary for understanding these important bacterial toxins.