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Related Experiment Videos

Lambda repressor recognizes the approximately 2-fold symmetric half-operator sequences asymmetrically.

A Sarai1, Y Takeda

  • 1Laboratory of Mathematical Biology, National Cancer Institute, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

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Lambda repressor dimer binds DNA operator asymmetrically. Specific base interactions, not a simple code, dictate this asymmetric protein-DNA recognition, confirmed by structural data.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The lambda repressor dimer is a key regulator of bacteriophage lambda DNA replication.
  • Understanding protein-DNA interactions is crucial for gene regulation studies.

Purpose of the Study:

  • To investigate the binding mechanism of the lambda repressor dimer to its operator DNA sequence.
  • To determine if the recognition is symmetric or asymmetric and elucidate the underlying molecular basis.

Main Methods:

  • Systematic base-substitution experiments were performed on the lambda operator DNA sequence.
  • Analysis of binding affinities and comparison with the crystal structure of the repressor-DNA complex.

Main Results:

Related Experiment Videos

  • Lambda repressor dimer recognizes the pseudo(2-fold)symmetric operator sequence asymmetrically.
  • Base substitutions in the consensus half of the operator significantly impact binding affinity more than in the nonconsensus half.
  • Structural data reveals slightly different positioning of repressor amino acids relative to DNA bases in each operator half.

    • Conclusions:

    • Lambda repressor subunits bind differently to the two operator halves, indicating asymmetric recognition.
    • Specific hydrogen bonds and hydrophobic contacts between repressor amino acids (alpha 3-helix, N-terminus arm) and DNA bases mediate sequence readout.
    • The findings challenge the notion of a simple, universal recognition code in protein-DNA interactions.