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Oligomerization of p53 is necessary to inhibit its transcriptional transactivation property at high protein

A Kristjuhan1, V Jaks, I Rimm

  • 1Institute of Molecular and Cell Biology, Estonian Biocentre, Tartu University.

Oncogene
|June 10, 1998
PubMed

Insights

Tumor suppressor protein p53

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Protein Biochemistry

Background:

  • Tumor suppressor protein p53 plays a critical role in preventing cancer.
  • Previously, we observed that high concentrations of p53 inhibit its own function in vivo.
  • The structural basis for this concentration-dependent inhibition remained unclear.

Purpose of the Study:

  • To investigate the structural elements of p53 responsible for transactivation inhibition at high protein levels.
  • To determine the role of the p53 oligomerization domain in this phenomenon.

Main Methods:

  • Characterization of p53 mutants with altered oligomerization capabilities.
  • In vivo assessment of transactivation activity at varying protein concentrations.
  • Analysis of structural requirements for p53 function.

Main Results:

  • The oligomerization domain of p53 is crucial for the loss of transactivation at elevated protein concentrations.
  • p53 mutants incapable of oligomerization do not exhibit this suppressive effect.
  • The intrinsic transactivating properties of p53 remain unaffected in these mutants.

Conclusions:

  • p53 oligomerization is essential for the auto-inhibitory mechanism observed at high protein concentrations.
  • Targeting the oligomerization domain could offer new therapeutic strategies in cancer.
  • Understanding p53's structural dynamics is key to modulating its tumor-suppressive functions.

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