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Ekaterina V Filippova1,2, Bozena Zemaitaitis3, Theint Aung4

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The RcsB regulator controls over 600 bacterial genes. Crystal structures reveal how RcsB binds DNA and forms unique structures, clarifying its role in bacterial transcription regulation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Structural Biology

Background:

  • RcsB is a conserved transcription regulator in the Rcs phosphorelay system, crucial for virulence and pathogenicity in human pathogens.
  • It regulates over 600 bacterial genes, including those involved in biofilm formation, capsule biosynthesis, and antibiotic resistance.
  • The precise molecular mechanisms by which RcsB controls such a large number of genes remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms of RcsB-mediated transcriptional regulation.
  • To determine the structural basis for RcsB's DNA recognition and oligomerization.
  • To provide insights into the Rcs phosphorelay system's function in Enterobacteriaceae.

Main Methods:

  • X-ray crystallography to determine the structures of unphosphorylated RcsB bound to DNA fragments (DNA22 and DNA18) from the *flhDC* operon.
  • In vitro binding assays to assess RcsB's DNA-binding capabilities and oligomeric states.

Main Results:

  • Crystal structures of RcsB complexed with DNA22 and DNA18 were determined at 3.15 Å and 3.37 Å resolution, respectively.
  • Structural analysis revealed how RcsB recognizes specific DNA sequences.
  • A unique oligomeric state of RcsB was identified, enabling homo- and heterodimer formation.

Conclusions:

  • The study provides structural and biochemical insights into RcsB's DNA recognition and regulatory mechanisms.
  • Understanding RcsB's structure and function is key to deciphering the complex transcriptional regulation in bacteria, particularly within the Enterobacteriaceae family.
  • This knowledge can inform strategies targeting RcsB in pathogenic bacteria.