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Mobile genetic elements spread via repressors, but a novel Staphylococcus aureus pathogenicity island (SaPI) system uses a unique tetrameric repressor. A phage protein derepresses this system, enabling SaPI transfer.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Mobile genetic elements (MGEs) like pathogenicity islands (SaPIs) spread through repressor regulation.
  • Understanding these regulatory mechanisms is crucial for controlling virulence factor dissemination.

Purpose of the Study:

  • To elucidate the novel repression-derepression mechanism governing Staphylococcus aureus pathogenicity island (SaPI) transfer.
  • To characterize the structure and function of the SaPI1 repressor, StlSaPI1.

Main Methods:

  • Structural analysis of the StlSaPI1 repressor.
  • Biochemical assays to study repressor-DNA interactions.
  • Investigating the interaction between StlSaPI1 and the phage-encoded protein Sri.

Main Results:

  • The SaPI1 repressor, StlSaPI1, exhibits an unprecedented tetrameric conformation, unlike classical dimeric repressors.
  • Two StlSaPI1 tetramers are required for effective repression of SaPI1.
  • The phage protein Sri induces a conformational change in StlSaPI1, disrupting its DNA binding and enabling SaPI1 transfer.
  • This repression-derepression system is conserved across various SaPIs, indicating widespread occurrence.

Conclusions:

  • A novel tetrameric repressor system controls SaPI transfer in Staphylococcus aureus.
  • This mechanism involves specific derepression by a phage-encoded protein, highlighting intricate inter-element regulation.
  • The findings reveal a widespread strategy for the dissemination of virulence factors encoded by MGEs.