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Related Experiment Videos

TFIIA induces conformational changes in TFIID via interactions with the basic repeat.

D K Lee1, J DeJong, S Hashimoto

  • 1Laboratory of Biochemistry and Molecular Biology, Rockefeller University, New York, New York 10021.

Molecular and Cellular Biology
|November 1, 1992
PubMed
Summary
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Transcription factor IIA (TFIIA) enhances transcription factor II D (TFIID) binding to DNA by overcoming inhibitory effects from TFIID's N terminus. This interaction may enable TFIID to recognize diverse promoter sequences.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transcription initiation in eukaryotes involves complex protein-DNA interactions.
  • TFIID (Transcription Factor II D) is a crucial initiator of transcription.
  • TFIIA (Transcription Factor II A) is known to interact with TFIID.

Purpose of the Study:

  • To elucidate the mechanism by which TFIIA influences TFIID's DNA binding.
  • To investigate the role of TFIID's N terminus in TFIIA-mediated regulation.
  • To determine if TFIIA affects TFIID's promoter specificity.

Main Methods:

  • Site-directed mutagenesis of Saccharomyces cerevisiae TFIID.
  • DNA-binding assays using purified TFIID and TFIIA.
  • Analysis of TFIID-DNA interactions with TATA-containing probes.

Related Experiment Videos

Main Results:

  • TFIIA interacts with TFIID's basic repeat region, inducing structural changes.
  • TFIIA compensates for TFIID mutations that impair DNA binding.
  • TFIIA binding to TFIID becomes temperature-independent, mimicking N-terminal truncation.
  • TFIIA reduces the influence of flanking DNA sequences on TFIID binding.

Conclusions:

  • TFIIA enhances TFIID DNA binding by negating inhibitory effects of TFIID's nonconserved N terminus.
  • TFIIA may broaden the range of promoters recognized by TFIID by reducing sensitivity to flanking sequences.