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Related Experiment Videos

Adenovirus E1A activation domain binds the basic repeat in the TATA box transcription factor.

W S Lee1, C C Kao, G O Bryant

  • 1Department of Microbiology and Molecular Genetics, University of California, Los Angeles 90024-1570.

Cell
|October 18, 1991
PubMed
Summary

Adenovirus large E1A protein binds to TFIID, a key transcription factor. This interaction, involving E1A's activation domain, is crucial for E1A-mediated gene activation.

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Area of Science:

  • Molecular Biology
  • Virology
  • Gene Regulation

Background:

  • Adenovirus large E1A protein is a known potent activator of transcription.
  • Transcription initiation by RNA polymerase II requires general transcription factors, including TFIID.

Purpose of the Study:

  • To investigate the molecular mechanism by which adenovirus large E1A protein activates transcription.
  • To determine if E1A directly interacts with general transcription factors.

Main Methods:

  • Sedimentation velocity centrifugation to analyze protein-protein interactions.
  • Biochemical assays to map binding domains between E1A and TFIID.
  • Mutational analysis of E1A to assess the role of TFIID binding in transactivation.

Main Results:

Related Experiment Videos

  • Adenovirus large E1A protein specifically and stably binds to TATA box-binding factor (TFIID).
  • E1A and TFIID form a heterodimer in vitro.
  • The activation domain of E1A (conserved region 3) binds to a specific 51-residue region within the C-terminal domain of TFIID.

Conclusions:

  • TFIID is a direct binding partner of the adenovirus large E1A protein.
  • Binding of E1A to TFIID is a necessary, though not sufficient, step for E1A-mediated transactivation.
  • This interaction provides a molecular basis for E1A's role in regulating viral and cellular gene expression.