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Related Experiment Videos

Tet repressor-tet operator contacts probed by operator DNA-modification interference studies.

C Heuer1, W Hillen

  • 1Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie und Biochemie der Friedrich-Alexander-Universität, Erlangen, F.R.G.

Journal of Molecular Biology
|August 5, 1988
PubMed
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Tet repressor protein binds tet operator DNA by making 12 contacts, with 8 being crucial for binding. These interactions, primarily on one side of the DNA, reveal the protein-DNA complex

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Tet repressor protein controls gene expression by binding to the tet operator DNA sequence.
  • Understanding these specific interactions is key to deciphering gene regulation mechanisms.

Purpose of the Study:

  • To precisely map the contact points between Tet repressor and tet operator DNA.
  • To elucidate the structural basis of Tet repressor-DNA recognition.

Main Methods:

  • Modification interference studies using ethylation, methylation, and carbethoxylation.
  • Polyacrylamide gel electrophoresis to separate DNA fragments based on affinity.
  • Analysis of interference patterns to identify critical contact sites.

Main Results:

Related Experiment Videos

  • Identified 12 phosphate contacts and specific guanine N-7 contacts, with 8 being critical for binding.
  • Demonstrated twofold dyad symmetry in the repressor-operator complex.
  • Localized sequence-specific contacts to the inner four base pairs of each operator half-site.

Conclusions:

  • Tet repressor binding involves specific contacts with DNA phosphates and guanine residues.
  • The identified contacts and symmetry are consistent with the known structure of the repressor-operator complex.
  • This study provides detailed insights into the molecular recognition of Tet repressor for its operator DNA.