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Protein cooperativity in DNA binding can occur through DNA structure, not just protein interactions. This study reveals how the Fis protein uses DNA allostery to recruit Xis proteins for phage lambda excision.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Protein binding to DNA is crucial for regulating gene activity.
  • Cooperative binding enhances protein assembly on chromosomes.
  • Mechanisms include protein-protein interactions and DNA structure modulation.

Purpose of the Study:

  • To elucidate the mechanism of cooperative binding between Fis and Xis proteins at the attR site.
  • To investigate the role of DNA structure in mediating protein-DNA interactions during phage lambda excision.

Main Methods:

  • X-ray crystallography of DNA-protein complexes (Fis + Xis, Fis alone, Xis alone).
  • Mutant protein and DNA binding assays.
  • Structural comparisons and analysis of DNA allostery.

Main Results:

  • Fis and Xis proteins show minimal direct contact in the DNA complex.
  • Fis binding alters DNA minor groove shape, facilitating Xis β-hairpin insertion.
  • Fis binding also induces DNA bending, promoting Xis-DNA contacts in the major groove.
  • A specific pyrimidine-purine step in DNA is critical for the Fis-induced minor groove conformation.

Conclusions:

  • Cooperative binding of Fis and Xis is primarily mediated by DNA allostery.
  • Fis acts as a DNA architect, remodeling the DNA structure to recruit Xis.
  • This mechanism highlights the importance of DNA structure in facilitating protein assembly and function.