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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Trim24 targets endogenous p53 for degradation

Kendra Allton1, Abhinav K Jain, Hans-Martin Herz

  • 1Department of Biochemistry and Molecular Biology, Program in Genes and Development, Graduate School of Biomedical Sciences and Center for Stem Cell and Developmental Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 27, 2009
PubMed

Insights

Researchers identified Tripartite-motif protein 24 (Trim24) as a novel negative regulator of the tumor suppressor p53. Trim24 targets p53 for ubiquitylation, offering a potential therapeutic strategy for cancer.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • The tumor suppressor p53 is crucial for genomic stability, cell cycle arrest, and apoptosis, but is frequently mutated in human cancers.
  • Most p53 research uses cancer cell lines, which may have mutated or dysfunctional p53 regulatory pathways.
  • Understanding p53 regulation in normal cells is essential for cancer research.

Purpose of the Study:

  • To investigate the regulation of endogenous p53 in normal cells.
  • To identify novel p53-interacting proteins and regulatory mechanisms.
  • To explore the therapeutic potential of targeting p53 regulators.

Main Methods:

  • Created a knock-in mouse and stem cell model with a tandem-affinity-purification (TAP) epitope on endogenous Trp-53.
  • Utilized mass spectrometry to identify p53-interacting proteins from purified complexes.
  • Performed in vivo studies in Drosophila and human breast cancer cells to validate findings.

Main Results:

  • Identified Tripartite-motif protein 24 (Trim24) as a novel p53-binding partner.
  • Demonstrated that Trim24 negatively regulates p53 levels through ubiquitylation.
  • Showed that Trim24/bonus pathway negatively regulates p53 in Drosophila, and this link is conserved in human cells, where Trim24 depletion causes p53-dependent apoptosis.

Conclusions:

  • Trim24 is an evolutionarily conserved negative regulator of p53.
  • Trim24-mediated ubiquitylation of p53 impacts tumor suppression.
  • Targeting Trim24 may represent a novel therapeutic strategy to restore p53's tumor-suppressive functions.

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