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Related Experiment Videos

Protein-protein interactions in a higher-order structure direct lambda site-specific recombination.

J F Thompson1, L M de Vargas, S E Skinner

  • 1Division of Biology and Medicine, Brown University, Providence, RI 02912.

Journal of Molecular Biology
|June 5, 1987
PubMed
Summary
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Bacteriophage lambda recombination is regulated by protein binding to DNA sites. Cooperative and competitive interactions create a biological switch, controlled by DNA higher-order structures.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Site-specific recombination in bacteriophage lambda is a complex process.
  • Regulation involves multiple proteins binding to specific DNA sites (attP and attR).

Purpose of the Study:

  • To elucidate the regulatory mechanisms of bacteriophage lambda site-specific recombination.
  • To understand how protein binding stimulates or inhibits recombination through cooperative and competitive interactions.

Main Methods:

  • Nuclease protection assays to map protein-DNA interactions.
  • Recombination studies using wild-type and mutant DNA sequences.
  • Analysis of DNA higher-order structures influenced by protein binding.

Main Results:

Related Experiment Videos

  • Identified cooperative binding of three proteins to attP and attR DNA sites.
  • Demonstrated a competitive interaction acting as a 'biological switch'.
  • Showed that this switch depends on long-range interactions and higher-order DNA structures, not simple site occlusion.

Conclusions:

  • Bacteriophage lambda recombination is precisely controlled by intricate protein-DNA interactions.
  • Cooperative and competitive protein binding, mediated by DNA higher-order structures, governs recombination outcomes.
  • The protein-DNA complex functions as a sophisticated biological switch for genetic recombination.