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Refined 1.8 A crystal structure of the lambda repressor-operator complex.

L J Beamer1, C O Pabo

  • 1Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Journal of Molecular Biology
|September 5, 1992
PubMed
Summary
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The lambda repressor-operator complex

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The lambda repressor controls gene expression in bacteriophage lambda.
  • Understanding repressor-operator interactions is crucial for gene regulation.
  • Previous studies provided insights but lacked high-resolution structural detail.

Purpose of the Study:

  • To refine the crystal structure of the lambda repressor-operator complex.
  • To elucidate the detailed interactions between the repressor's N-terminal arm and the operator DNA.
  • To reveal new protein-DNA contacts and H-bonding networks.

Main Methods:

  • X-ray crystallography at 1.8 A resolution.
  • Low-temperature data collection.
  • Structural refinement and analysis.

Related Experiment Videos

Main Results:

  • High-resolution structure of the lambda repressor-operator complex.
  • Detailed visualization of the N-terminal arm interactions with DNA.
  • Significant differences in repressor binding to the two operator halves, especially at the center.
  • Identification of new protein-DNA contacts and extensive hydrogen-bonding networks.
  • New details on the helix-turn-helix (HTH) region and water molecule positions.

Conclusions:

  • The N-terminal arm plays a key role in the asymmetric binding of lambda repressor to its operator.
  • The findings suggest a revised model for aligning lambda operator sites.
  • The high-resolution structure provides a comprehensive view of repressor-operator recognition and gene regulation.