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Related Experiment Videos

The RofA binding site in Streptococcus pyogenes is utilized in multiple transcriptional pathways.

A B Granok1, D Parsonage, R P Ross

  • 1Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63130-1093, USA.

Journal of Bacteriology
|February 29, 2000
PubMed
Summary

Streptococcus pyogenes RofA protein binds to two DNA sites to regulate its own expression and the fibronectin-binding protein F (prtF) gene. The larger binding site is crucial for activating both genes, suggesting a common regulatory pathway.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Adhesin regulation is key to understanding pathogenic bacteria's host interactions.
  • In Streptococcus pyogenes, the RofA protein controls fibronectin-binding adhesin F (prtF) gene transcription under anaerobic conditions.
  • RofA autoregulates its own expression and binds to target DNA promoters.

Purpose of the Study:

  • To investigate the specific interactions of RofA with its target promoters using DNase I protection assays.
  • To elucidate the roles of distinct RofA binding sites in regulating rofA and prtF gene expression.
  • To explore the implications of these findings for Streptococcus pyogenes virulence gene regulation.

Main Methods:

  • DNase I protection assays were employed to map RofA binding sites on promoter DNA.

Related Experiment Videos

  • Reporter gene fusions (prtF-PhoZ) were constructed and analyzed to assess transcriptional control.
  • Comparative analysis was performed across different strains of Streptococcus pyogenes with varying prtF expression patterns.

    • Main Results:

    • RofA binds to two distinct sites between the rofA and prtF genes: a small 17 bp site and a large 40 bp site.
    • The small RofA binding site primarily influences rofA autoregulation, not prtF transcription.
    • The large RofA binding site is essential for activating both rofA and prtF in all tested strains, via RofA-dependent and -independent pathways.

    Conclusions:

    • A common DNA recognition sequence (large binding site) serves as a regulatory entry point for virulence gene expression in Streptococcus pyogenes.
    • The findings suggest a complex regulatory network involving RofA-like proteins and their binding sites.
    • This study provides insights into the intricate mechanisms governing Streptococcus pyogenes pathogenesis.