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Related Experiment Videos

How Cro and lambda-repressor distinguish between operators: the structural basis underlying a genetic switch

R A Albright1, B W Matthews

  • 1Institute of Molecular Biology, Howard Hughes Medical Institute and Department of Physics, University of Oregon, Eugene, OR 97403, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 9, 1998
PubMed
Summary
This summary is machine-generated.

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Structural analysis of phage lambda proteins reveals distinct DNA binding modes. Lambda-Cro and lambda-repressor proteins utilize different binding alignments and DNA bending to discriminate operator sites, challenging simple recognition codes.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Phage lambda utilizes regulatory proteins, Cro and lambda-repressor, to control gene expression by binding to specific DNA operator sequences.
  • Understanding the three-dimensional structures of these protein-DNA complexes is crucial for deciphering the mechanisms of sequence recognition and discrimination.

Purpose of the Study:

  • To analyze and compare the three-dimensional structures of lambda-Cro and lambda-repressor bound to their respective DNA operators.
  • To elucidate how these proteins discriminate between different operator sequences in phage lambda.

Main Methods:

  • Analysis of existing three-dimensional structural data for lambda-Cro-DNA and lambda-repressor-DNA complexes.
  • Comparison of protein-DNA binding alignments, helix-turn-helix orientations, and DNA bending induced by each protein.

Related Experiment Videos

Main Results:

  • Lambda-Cro and lambda-repressor exhibit distinct binding alignments of their helix-turn-helix units.
  • Cro binding induces greater DNA bending compared to lambda-repressor binding.
  • Both proteins utilize similar interactions with invariant DNA base pairs (2 and 4) for general operator recognition, but differ in subtle van der Waals contacts and other interactions for specific operator discrimination.

Conclusions:

  • The discrimination between different operators by lambda-Cro and lambda-repressor is achieved through a combination of distinct binding geometries and subtle sequence-specific contacts.
  • These findings support the concept that DNA-protein recognition is complex and does not rely on a simple, universal code.