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Related Experiment Videos

How Trp repressor binds to its operator.

D Staacke1, B Walter, B Kisters-Woike

  • 1Institut für Genetik der Universität zu Köln, FRG.

The EMBO Journal
|June 1, 1990
PubMed
Summary
This summary is machine-generated.

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The established model of Trp repressor binding to the trp operator is incorrect. New findings show the repressor binds to a shifted sequence, challenging previous understanding of gene regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Trp repressor is a key regulator of the tryptophan operon in bacteria.
  • The accepted model posits a single Trp repressor dimer binding to the operator's center of symmetry.

Purpose of the Study:

  • To re-evaluate the binding site of the Trp repressor on the trp operator.
  • To identify the precise DNA sequence recognized by the Trp repressor.

Main Methods:

  • Electrophoretic mobility shift assays (EMSAs) were used to assess Trp repressor-DNA interactions.
  • Methylation protection experiments were conducted on natural and synthetic operator sequences.
  • Systematic base-pair variation in a synthetic operator determined optimal binding sequences.

Related Experiment Videos

Main Results:

  • The Trp repressor does not bind to the previously identified center of symmetry in the trp operator.
  • Binding occurs at a sequence shifted four base pairs from the presumed central axis.
  • A consensus sequence for optimal Trp repressor binding was identified through mutagenesis.

Conclusions:

  • The current model of Trp repressor-operator interaction requires revision.
  • The actual binding site is offset from the operator's axis of symmetry.
  • This finding impacts our understanding of bacterial gene regulation by tryptophan.