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Proteasome-mediated degradation of transcriptional activators correlates with activation domain potency in vivo

E Molinari1, M Gilman, S Natesan

  • 1ARIAD Gene Therapeutics Inc., 26 Landsdowne Street, Cambridge, MA 02139, USA.

The EMBO Journal
|November 24, 1999
PubMed

Insights

Transcriptional activator protein levels are controlled by proteasome degradation. Potent activators and those recruited to DNA are rapidly degraded, suggesting proteasomal control is key for gene regulation.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Protein Degradation

Background:

  • Transcriptional activators are crucial for gene expression.
  • Their intracellular levels must be tightly regulated.
  • The role of protein degradation in this regulation is not fully understood.

Purpose of the Study:

  • To investigate the role of the proteasome-mediated protein degradation pathway in regulating transcriptional activator protein concentration.
  • To determine the relationship between activator potency and degradation rate.
  • To elucidate the impact of mutations and recruitment on activator degradation.

Main Methods:

  • Studying proteasome-mediated degradation of transcriptional activators in vivo.
  • Assessing the correlation between activation domain potency and degradation rate.
  • Analyzing the effects of mutations in activation and DNA-binding domains on function and degradation.
  • Employing a rapamycin-regulated gene expression system to study activator recruitment.

Main Results:

  • Intracellular concentrations of transcriptional activators are regulated by proteasome-mediated degradation.
  • The degradation rate of activators correlates with activation domain potency.
  • Mutations affecting target protein interaction or DNA binding abolish function and confer resistance to degradation.
  • Recruiting activation domains to DNA-bound receptors significantly enhances degradation rates.

Conclusions:

  • Proteasome-mediated degradation is a key mechanism controlling transcriptional activator levels in mammalian cells.
  • Activation domain potency and recruitment to DNA influence degradation rates.
  • This pathway likely plays a significant role in the precise regulation of gene expression.

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