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Tet repressor mutants with altered effector binding and allostery.

Eva-Maria Henssler1, Ralph Bertram, Stefanie Wisshak

  • 1Lehrstuhl für Mikrobiologie, Institut für Biologie, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.

The FEBS Journal
|September 1, 2005
PubMed
Summary

Mutations in the Tet repressor (TetR) DNA binding interface reveal a novel allosteric communication mode. This affects both DNA and effector binding, challenging existing models of TetR function.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • The Tet repressor (TetR) regulates gene expression by binding to DNA and responding to small molecule effectors.
  • Understanding the allosteric mechanisms governing TetR function is crucial for its application in synthetic biology and gene therapy.

Purpose of the Study:

  • To investigate the correlation between allostery and ligand binding in TetR.
  • To analyze the impact of mutations at the DNA reading head-core interface on the effector-specific TetR(i2) variant.

Main Methods:

  • Site-directed mutagenesis to introduce specific amino acid substitutions.
  • Analysis of DNA binding affinity and effector binding thermodynamics.
  • Characterization of TetR activity in response to effector molecules.

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Main Results:

  • Mutations at the DNA reading head-core interface differentially affected TetR activity, DNA binding, and effector binding.
  • The V99G mutation, which caused corepression in wild-type TetR, led to effector-dependent repression and reduced DNA binding in the TetR(i2) variant.
  • Thermodynamic analysis indicated decreased effector affinities and positive cooperativity, suggesting altered allosteric signaling.

Conclusions:

  • Mutations in the TetR DNA reading head-core interface can modulate both DNA and effector binding, even without direct contact with ligand binding sites.
  • This study reveals a novel mode of allosteric communication in TetR.
  • Allosteric regulation in TetR may involve mechanisms beyond those predicted by static crystal structures.