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Related Experiment Videos

The phage 434 Cro/OR1 complex at 2.5 A resolution.

A Mondragón1, S C Harrison

  • 1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.

Journal of Molecular Biology
|May 20, 1991
PubMed
Summary

The crystal structure of phage 434 Cro protein bound to OR1 operator DNA reveals a bent DNA conformation. Extensive protein-DNA interactions, including hydrogen bonds and van der Waals forces, are crucial for binding and recognition.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Bacteriophage 434 Cro protein regulates viral gene expression by binding to operator DNA sequences.
  • Understanding the structural basis of Cro protein-DNA interactions is essential for deciphering gene regulation mechanisms.

Purpose of the Study:

  • To determine the high-resolution crystal structure of phage 434 Cro protein complexed with the OR1 operator DNA.
  • To elucidate the structural features of DNA binding and the molecular interactions involved.

Main Methods:

  • X-ray crystallography was employed to determine the structure at 2.5 A resolution.
  • The DNA fragment used was a 20 base-pair sequence corresponding to the OR1 operator site.

Main Results:

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  • The crystal structure revealed a bent conformation of the OR1 DNA fragment, with central base-pairs showing significant deviations from planarity.
  • Two Cro protein molecules formed an extensive interface with the DNA, mediated by hydrogen bonds and van der Waals interactions.

Conclusions:

  • The observed DNA bending and specific protein-DNA contacts are critical for sequence recognition and stable binding of Cro protein to the operator.
  • These findings provide detailed insights into the molecular mechanisms of transcriptional repression by phage 434 Cro protein.