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Area of Science:

  • Microbiology
  • Molecular Biology
  • Dermatology

Background:

  • Staphylococcal exfoliative toxins (ETs) are serine proteases.
  • ETs cleave desmoglein 1 (Dsg1), causing skin blistering in staphylococcal infections.

Purpose of the Study:

  • To genetically and enzymatically characterize a novel exfoliative toxin gene (ete) identified in *S. aureus* O46.
  • To investigate the species-specific cleavage activity of the new toxin, ETE.

Main Methods:

  • Genome sequencing, assembly, and annotation of *S. aureus* O46.
  • Sequence identity comparison with known exfoliative toxins (ETA, ETB, ETD).
  • In vivo skin exfoliation assays in neonatal mice and in vitro Dsg1 cleavage assays across various species.

Main Results:

  • A new exfoliative toxin gene, named ete, was identified and characterized.
  • The recombinant ETE protein induced skin exfoliation in mice.
  • ETE degraded Dsg1 in murine, ovine, caprine, human, and swine epidermis but not in canine or bovine epidermis.
  • Molecular modeling suggested ETE's species-specificity is due to its docking orientation on Dsg1.

Conclusions:

  • ETE represents a novel staphylococcal exfoliative toxin with distinct species-specific activity.
  • ETE may contribute to bacterial colonization in stratified epithelia of ruminants with mastitis.
  • Understanding ETE's mechanism provides insights into staphylococcal pathogenesis and host-pathogen interactions.