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p53 tetramerization: at the center of the dominant-negative effect of mutant p53

Jovanka Gencel-Augusto1,2, Guillermina Lozano1,2

  • 1Genetics and Epigenetics Graduate Program, The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas 77030, USA.

Genes & Development
|September 3, 2020
PubMed

Insights

Mutant p53 proteins can inactivate normal p53 function, a process influenced by upstream signals and posttranslational modifications. Understanding this dominant-negative effect is key to developing therapies that restore tumor suppression.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • The p53 tumor suppressor is a critical regulator of hundreds of genes, often in a tissue-specific manner.
  • Missense mutations in cancer frequently affect the p53 DNA-binding and tetramerization domains, highlighting their importance in tumor suppression.
  • Mutant p53 proteins with intact tetramerization domains can form mixed tetramers with wild-type p53, leading to dominant-negative effects (DNE).

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the dominant-negative effects (DNE) of mutant p53 on wild-type p53 activity.
  • To explore the role of upstream signals and posttranslational modifications in modulating p53 tetramerization and DNE.
  • To identify potential therapeutic targets for restoring wild-type p53 function in cancer.

Main Methods:

  • Analysis of p53 tetramerization domain function in cancer mutants.
  • Investigation of the impact of DNA damage and upstream signaling on p53 DNE.
  • Examination of posttranslational modifications and protein-protein interactions affecting p53 tetramerization.

Main Results:

  • p53 mutants with functional tetramerization domains can form mixed tetramers, exerting dominant-negative effects on wild-type p53.
  • DNA damage is a necessary but insufficient condition for DNE, suggesting involvement of upstream regulatory pathways.
  • Posttranslational modifications and protein interactions modulate p53 tetramerization, influencing its stability, localization, and transcriptional activity, thereby limiting DNE.

Conclusions:

  • Regulatory mechanisms involving posttranslational modifications and protein interactions act as a safeguard against the complete inactivation of wild-type p53 by mutants.
  • A comprehensive understanding of the molecular basis of p53 dominant-negative effects is crucial for developing novel therapeutic strategies.
  • Targeting these regulatory pathways could lead to drugs that release wild-type p53, restoring its tumor suppressive functions.
Keywords:
tetramerizationtranscription factortumor suppressor

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