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Related Experiment Videos

The Met repressor-operator complex: DNA recognition by beta-strands

W S Somers1, J B Rafferty, K Phillips

  • 1University of Leeds, United Kingdom.

Annals of the New York Academy of Sciences
|July 29, 1994
PubMed
Summary
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The crystal structure of E. coli met repressor bound to DNA reveals a novel beta-ribbon motif for sequence-specific binding. Cooperative binding and S-adenosyl methionine (SAM) activation occur via electrostatic interactions.

Area of Science:

  • Structural biology
  • Molecular biology
  • Biochemistry

Background:

  • The E. coli met repressor regulates methionine biosynthesis genes.
  • Understanding repressor-DNA interactions is crucial for gene regulation studies.

Purpose of the Study:

  • To elucidate the structural basis of E. coli met repressor binding to DNA.
  • To investigate the mechanism of cooperative binding and corepressor (SAM) activation.

Main Methods:

  • X-ray crystallography of the E. coli met repressor-DNA complex.
  • Analysis of DNA-protein interactions and structural features.
  • Computational electrostatic calculations.

Main Results:

  • Two dimeric repressor molecules bind adjacent met-box sites on DNA.

Related Experiment Videos

  • A novel beta-ribbon motif inserts into the DNA major groove for sequence-specific binding.
  • Antiparallel alpha-helix interactions between adjacent dimers mediate cooperative binding.
  • S-adenosyl methionine (SAM) binding does not induce major conformational changes.
  • Long-range electrostatic interactions likely enhance DNA binding upon SAM activation.

    • Conclusions:

    • The study reveals a novel DNA binding motif and mechanism for the E. coli met repressor.
    • Cooperative binding and SAM-induced activation are explained by structural and electrostatic interactions.