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Related Experiment Videos

How does trp repressor bind to its operator?

J Carey1, D E Lewis, T A Lavoie

  • 1Chemistry Department, Princeton University, New Jersey 08544.

The Journal of Biological Chemistry
|December 25, 1991
PubMed
Summary
This summary is machine-generated.

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The Escherichia coli trp repressor binds its operator DNA with high affinity and specificity. This study clarifies the repressor-DNA complex structure and binding mechanisms.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The co-crystal structure of Escherichia coli trp repressor with DNA revealed an unexpected buried water layer and absence of direct hydrogen bonds.
  • Existing models propose different explanations for this structural observation and its implications for DNA binding.

Purpose of the Study:

  • To investigate the physical and biochemical basis of the Escherichia coli trp repressor-DNA interaction.
  • To test the predictions of different models explaining the repressor-DNA complex structure.

Main Methods:

  • High-affinity DNA binding assays to determine specificity and stoichiometry.
  • Biochemical measurements to assess DNA structure in solution.
  • Analysis of repressor-DNA binding under various conditions.

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Main Results:

  • The specific operator DNA sequence binds the repressor with high affinity and 1:1 stoichiometry, confirming its role as the true target.
  • An alternative DNA sequence exhibited weaker binding and higher stoichiometry, suggesting a cooperative binding mode.
  • Operator DNA maintained a B-form helical structure in solution, irrespective of repressor presence.
  • Repressor-operator DNA affinity was modulated by conditions used during co-crystallization.

Conclusions:

  • The study provides experimental evidence supporting the high-affinity, specific binding of the Escherichia coli trp repressor to its operator DNA.
  • Findings clarify the structural and functional aspects of repressor-DNA recognition, highlighting the influence of solution conditions on binding affinity.