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Related Experiment Videos

DNA bends in TATA-binding protein-TATA complexes in solution are DNA sequence-dependent.

J Wu1, K M Parkhurst, R M Powell

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, USA.

The Journal of Biological Chemistry
|March 30, 2001
PubMed
Summary

The TATA-binding protein (TBP) bends DNA differently based on the TATA sequence, influencing transcription efficiency. This DNA bending in TBP-TATA complexes, not binding strength, dictates how efficiently transcription starts.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • TATA-binding protein (TBP) is crucial for initiating transcription at eukaryotic class II promoters.
  • TBP binds to and restructures TATA box DNA sequences, influencing gene expression.
  • Understanding the structural dynamics of TBP-TATA complexes is key to deciphering transcription regulation.

Purpose of the Study:

  • To investigate the sequence-dependent structural changes in TBP-TATA complexes in solution.
  • To correlate DNA bending angles with transcription activity and TBP-DNA binding affinities.
  • To elucidate the role of DNA structure in the TBP-TATA binary complex for preinitiation complex assembly.

Main Methods:

  • Utilized fluorescence resonance energy transfer (FRET) to measure distances in TBP-TATA complexes in solution.

Related Experiment Videos

  • Synthesized oligomers with the adenovirus major late promoter (AdMLP) sequence and single-site variants.
  • Compared solution structures with existing X-ray crystallography data.

    • Main Results:

    • Solution bend angles for TBP-AdMLP complexes varied significantly (30-76 degrees), contrasting with crystal structures (approx. 80 degrees).
    • Transcription activities strongly correlated with solution bend angles, but not TBP-DNA binding affinities.
    • Sequence-specific DNA bending in the TBP-TATA complex influences transcription efficiency.

    Conclusions:

    • Transcription efficiency is primarily determined by the sequence-dependent structure of the TBP-TATA binary complex.
    • The probability of adopting a severely bent DNA conformation dictates the formation of a functional preinitiation complex.
    • This structural flexibility allows for precise orientation of other transcription factors, regulating gene expression.