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Related Experiment Videos

Signals for TBP/TATA box recognition.

A Bareket-Samish1, I Cohen, T E Haran

  • 1Department of Biology, Technion, Technion City, Haifa, 32000, Israel. bitali@tx.technion.ac.il

Journal of Molecular Biology
|June 14, 2000
PubMed
Summary
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TATA box-binding protein (TBP) recognizes DNA indirectly. Sequence changes within TATA boxes affect TBP complex stability, revealing key recognition signals. Flanking DNA alterations also influence stability for specific TATA sequences.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • TATA box-binding protein (TBP) is crucial for transcription initiation.
  • TBP recognizes DNA via indirect readout, sensing sequence through DNA conformation.
  • Understanding TBP-DNA interactions is key to gene regulation.

Purpose of the Study:

  • To elucidate the molecular mechanisms of TBP's indirect readout of TATA boxes.
  • To investigate how sequence variations within and flanking TATA boxes affect TBP binding kinetics and DNA bending.
  • To identify specific DNA sequence features critical for TBP recognition.

Main Methods:

  • Studied TBP binding to adenovirus major late promoter (AdMLP) sequence variants.
  • Measured dissociation kinetics of TBP-DNA complexes.

Related Experiment Videos

  • Utilized phase-sensitive assays to determine intrinsic and TBP-induced DNA bending.

    • Main Results:

    • Kinetic stability of TBP/TATA box complexes correlates with sequence changes within TATA elements.
    • Identified base-pair and larger DNA tract signals involved in TBP recognition.
    • DNA bending induced by TBP did not correlate with complex stability.
    • Alterations flanking TATA boxes significantly impacted kinetic stability for alternating TA sequences but not for A tracts.

    Conclusions:

    • TBP recognition involves specific sequence signals at single base-pair and larger tract levels.
    • DNA bending is not the primary determinant of TBP/TATA box complex stability.
    • The DNA region flanking the TATA box plays a role in kinetic stability, particularly for certain sequence contexts.