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The C-terminus of mutant p53 is necessary for its ability to interfere with growth arrest or apoptosis

A Sigal1, D Matas, N Almog

  • 1Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100, Israel.

Oncogene
|August 25, 2001
PubMed

Insights

Mutant p53 proteins can suppress apoptosis and G2 arrest, requiring an unmodified C-terminus. This suggests mutant p53 broadly increases resistance to genotoxic stress, offering potential therapeutic targets in cancer cells.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Cellular Stress Response

Background:

  • Mutant p53 proteins are implicated in oncogenesis, potentially through suppressing apoptosis.
  • The structural basis and specificity of mutant p53's stress response inhibition remain unclear.

Purpose of the Study:

  • To investigate the structural elements of mutant p53 required for apoptosis suppression.
  • To determine if mutant p53 inhibits only apoptosis or broadly affects cellular stress responses.

Main Methods:

  • Analysis of p53 mutant variants with modifications to the C-terminus.
  • Assessment of apoptosis and G2 arrest in response to genotoxic stress.

Main Results:

  • An unmodified C-terminus was essential for the p53 135(Ala to Val) mutant to suppress apoptosis.
  • The unmodified C-terminus was also required for suppressing G2 arrest, a key response to low genotoxic stress.
  • Mutant p53 activity appears to broadly increase the threshold for DNA damage response, not just apoptosis.

Conclusions:

  • Mutant p53's suppressive activity is not limited to apoptosis but affects the overall DNA damage response.
  • Targeting the reduced sensitivity of growth arrest in mutant p53 cells may offer a strategy for selective cancer therapy.

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