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Related Experiment Videos

Sequence specificity of bacteriophage 434 repressor-operator complexation

T H Duong1, K Zakrzewska

  • 1Laboratoire de Biochimie Théorique, UPR 9080 CNRS Institut de Biologie Physico-Chimique, 13 rue Pierre et Marie Curie, Paris, 75005, France.

Journal of Molecular Biology
|July 7, 1998
PubMed
Summary
This summary is machine-generated.

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The bacteriophage 434 repressor favors specific DNA sequences due to electrostatic interactions, not flexibility. Cationic Arg43 side-chains in the repressor are key to this sequence specificity in DNA operator binding.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • The bacteriophage 434 repressor exhibits sequence-specific DNA binding.
  • Central base pairs of the DNA operator, not directly contacted by the repressor, significantly influence binding affinity.

Purpose of the Study:

  • To investigate the origin of sequence specificity in bacteriophage 434 repressor-operator binding.
  • To determine the roles of DNA flexibility and electrostatic interactions in this binding.

Main Methods:

  • Molecular modeling of five model DNA operators with varying central base pairs (TA, AT, CG, GC, IC).
  • Analysis of DNA-oligomer complexes with the N-terminal binding domain of the 434 repressor.
  • Low-frequency normal mode analysis to assess nucleic acid flexibility.

Related Experiment Videos

  • Energetic analysis of operator-repressor complexes.

    • Main Results:

    • DNA operators with central TA and AT steps showed slightly higher twisting flexibility than those with CG, GC, or IC steps.
    • Flexibility differences were insufficient to explain the observed binding affinity strength.
    • Energetic analysis indicated that electrostatic interactions, specifically with cationic Arg43 side-chains of the repressor, drive the preference for AT and TA base pairs.
    • This finding was supported by studies with an R43A mutant repressor.

    Conclusions:

    • The sequence specificity of bacteriophage 434 repressor binding is primarily electrostatic, not due to DNA flexibility.
    • Cationic Arg43 side-chains play a crucial role in the repressor's preference for AT/TA base pairs in the DNA operator's minor groove.