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Spectroscopic studies on lambda cro protein-DNA interactions.

C Torigoe1, S Kidokoro, M Takimoto

  • 1Department of Physics, Faculty of Science, University of Tokyo, Japan.

Journal of Molecular Biology
|June 20, 1991
PubMed
Summary
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Lambda Cro protein binding to DNA causes specific overwinding and affects complex stability. Base substitutions alter DNA conformation and reduce Cro-DNA complex stability, impacting dissociation thermodynamics.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Lambda Cro protein is a key regulator of bacteriophage lambda.
  • Understanding Cro-DNA interactions is crucial for gene regulation studies.
  • DNA conformation changes significantly influence protein-DNA binding affinity.

Purpose of the Study:

  • To investigate the conformational changes of DNA upon lambda Cro binding.
  • To determine the thermodynamic parameters governing Cro-DNA complex dissociation.
  • To analyze the impact of operator base substitutions on Cro-DNA complex stability and conformation.

Main Methods:

  • Spectroscopic techniques including circular dichroism (CD) and fluorescence spectroscopy.
  • Thermodynamic studies employing salt titration experiments.

Related Experiment Videos

  • Site-directed mutagenesis to introduce base substitutions in the operator DNA sequence.

    • Main Results:

    • Specific Cro binding to consensus DNA sequences results in DNA overwinding, while non-specific binding leads to unwinding or no change.
    • Central base-pair substitutions or mismatches reduce DNA conformational changes and Cro-DNA complex stability.
    • Complex stability correlates positively with the degree of DNA conformational change during binding.
    • Cro-DNA complex dissociation exhibits distinct multi-state transitions (three states for specific binding, two for non-specific) dependent on salt concentration.
    • Approximately 7.7 ions are involved in the interaction between Cro and a 17 base-pair DNA sequence during NaCl titrations.
    • Predicted dissociation free energy aligns with experimental data when DNA overwinding occurs during specific binding.

    Conclusions:

    • DNA conformational changes, particularly overwinding, are integral to specific lambda Cro binding and complex stability.
    • Operator sequence integrity, even at non-contact positions, critically influences Cro-DNA complex thermodynamics.
    • The findings provide insights into the molecular mechanisms of sequence-specific protein-DNA recognition and regulation.