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Related Experiment Videos

Protein-DNA conformational changes in the crystal structure of a lambda Cro-operator complex.

R G Brennan1, S L Roderick, Y Takeda

  • 1Department of Physics, University of Oregon, Eugene 97403.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1990
PubMed
Summary

The bacteriophage lambda Cro protein undergoes significant conformational changes when binding to DNA, bending the operator DNA into a boomerang shape. This structural study reveals key insights into protein-DNA interactions.

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Area of Science:

  • Structural biology
  • Molecular biology
  • Biochemistry

Background:

  • Bacteriophage lambda Cro protein regulates gene expression.
  • Understanding protein-DNA interactions is crucial for molecular biology.
  • Previous models proposed Cro-DNA interaction mechanisms.

Purpose of the Study:

  • To determine the high-resolution structure of the bacteriophage lambda Cro protein-DNA complex.
  • To elucidate the conformational changes in Cro protein upon DNA binding.
  • To analyze the structural basis of Cro-DNA recognition.

Main Methods:

  • X-ray crystallography at 3.9-A resolution.
  • Use of site-specific iodinated DNA oligomers for isomorphous derivatives.
  • Analysis of three independent Cro-operator complexes.

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Main Results:

  • The Cro protein dimer undergoes a large conformational change, with monomers rotating ~40 degrees.
  • The DNA operator is bent ~40 degrees into a boomerang shape while maintaining B-form.
  • Observed DNA bending differs from other known protein-DNA complexes.

Conclusions:

  • The determined structure confirms and refines the proposed model for Cro-DNA interaction.
  • The study highlights significant protein conformational flexibility and DNA plasticity.
  • Provides a detailed atomic-level understanding of a key regulatory protein-DNA complex.