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Related Experiment Videos

p53 Dynamically Directs TFIID Assembly on Target Gene Promoters.

R A Coleman1, Z Qiao2, S K Singh2

  • 1Gruss Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York, USA robert.coleman2@einstein.yu.edu.

Molecular and Cellular Biology
|April 19, 2017
PubMed
Summary

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This summary is machine-generated.

The tumor suppressor protein p53 (also known as TP53) helps recruit the transcription factor TFIID to DNA. This study reveals how p53 dynamically guides TFIID to target promoters, ensuring proper gene regulation.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Biochemistry

Background:

  • The p53 protein is a crucial regulator of cellular integrity, activating gene networks in response to various stimuli.
  • p53 facilitates transcription initiation, partly by assisting the recruitment of the transcription factor TFIID to gene promoters.
  • The dynamic mechanisms of p53-TFIID interaction during promoter assembly are not fully understood.

Purpose of the Study:

  • To elucidate the precise molecular mechanisms by which p53 dynamically interacts with TFIID to facilitate its assembly on target gene promoters.
  • To investigate the role of p53 in modulating TFIID's DNA binding properties and promoter engagement.

Main Methods:

  • Single-molecule fluorescence microscopy for real-time observation of molecular interactions.
Keywords:
TFIIDp53single-molecule microscopystructuretranscription

Related Experiment Videos

  • Single-particle cryo-electron microscopy for structural analysis of TFIID-DNA-p53 complexes.
  • Biochemical assays to characterize binding affinities and kinetics.

    • Main Results:

    • TFIID alone exhibits poor binding to native p53 target promoters.
    • p53 enhances TFIID's promoter binding by stabilizing interactions with both the core promoter and p53 response elements.
    • p53 regulates transient and prolonged DNA binding modes of TFIID, and structural data show p53 and DNA promote a rearranged TFIID conformation.
    • p53 dissociation upon TFIID-DNA interaction facilitates further recruitment of basal transcription factors.

    Conclusions:

    • p53 acts as a dynamic escort, actively loading TFIID onto its target promoters.
    • These findings provide a mechanistic understanding of how p53 controls the recruitment of the general transcription factor TFIID.
    • The dynamic interplay between p53, TFIID, and DNA is essential for efficient transcription initiation at p53 target genes.