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The VP16 activation domain interacts with multiple transcriptional components as determined by protein-protein

Daniel B Hall1, Kevin Struhl

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.

The Journal of Biological Chemistry
|September 26, 2002
PubMed

Insights

This study identifies physiological protein interactions of transcriptional activators using formaldehyde cross-linking. Researchers found that the VP16 activation domain directly binds TATA-binding protein, TFIIB, and the SAGA complex in vivo.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transcriptional activator proteins are crucial for gene regulation, recruiting RNA polymerase II and chromatin modifiers to promoters.
  • Previous biochemical studies suggested numerous activator-protein interactions, but physiological relevance remains uncertain.
  • Identifying in vivo interactions is key to understanding gene transcription regulation.

Purpose of the Study:

  • To develop a formaldehyde-based cross-linking method for identifying physiologically relevant protein-protein interactions.
  • To investigate direct interactions of the VP16 activation domain in vivo.

Main Methods:

  • Development of a formaldehyde-based cross-linking procedure.
  • Application of the method to study interactions of the VP16 activation domain.
  • In vivo analysis of protein-protein interactions.

Main Results:

  • The formaldehyde cross-linking method successfully identified protein interactions under physiological conditions.
  • The VP16 activation domain was shown to directly interact with TATA-binding protein (TBP) in vivo.
  • Direct interactions were also observed between the VP16 activation domain and TFIIB, as well as the SAGA histone acetylase complex.

Conclusions:

  • Formaldehyde-based cross-linking is a viable method for identifying in vivo protein interactions relevant to transcriptional activation.
  • The VP16 activation domain engages directly with key components of the transcription machinery, including TBP, TFIIB, and SAGA, in a physiological context.

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