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Related Experiment Videos

DNA sequence dependent and independent conformational changes in multipartite operator recognition by

S Deb1, S Bandyopadhyay, S Roy

  • 1Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII M, Calcutta 700 054, India.

Biochemistry
|March 22, 2000
PubMed
Summary
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Bacteriophage lambda repressor proteins exhibit complex binding to DNA operator sites, involving significant conformational changes in both the DNA and protein. The extent of these changes depends on the spacing and sequence of the binding sites, influencing cooperative binding.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Cooperative binding of regulatory proteins to DNA is crucial for gene regulation.
  • Bacteriophage lambda repressor-operator system serves as a model for studying multipartite DNA recognition.
  • Understanding protein-DNA interactions informs gene expression control.

Purpose of the Study:

  • To investigate the conformational changes in bacteriophage lambda repressor and DNA during multipartite operator recognition.
  • To determine how DNA binding site separation and sequence affect protein-protein interactions and binding cooperativity.
  • To elucidate the molecular mechanisms underlying complex DNA-binding protein recognition.

Main Methods:

  • Near-UV circular dichroism spectroscopy to assess DNA distortion.

Related Experiment Videos

  • Tryptophan fluorescence quenching assays to monitor repressor conformational changes.
  • Acrylamide quenching to quantify protein accessibility and conformational states.
  • Titration experiments with single and paired operator sites.

    • Main Results:

    • DNA distortion varies significantly between different operator pairs (O(R)1-O(R)2, O(R)2-O(R)3, O(L)2-O(L)3).
    • Lambda-repressor exhibits distinct conformational states when bound to single operator sites (O(R)1, O(R)2, O(R)3), indicated by differential fluorescence quenching.
    • Cooperative binding to paired operator sites induces further conformational changes in the repressor, distinct from single-site binding, as evidenced by altered Stern-Volmer constants.

    Conclusions:

    • Lambda-repressor recognition of multipartite operators is a complex process involving dynamic conformational adjustments in both protein and DNA.
    • The spacing and sequence of DNA binding sites critically influence the nature and extent of these conformational changes and cooperative binding.
    • This study reveals a nuanced mechanism of regulatory protein-DNA interaction, highlighting the adaptability of repressor proteins to varied operator configurations.