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Related Experiment Videos

Cellular localization and cell cycle regulation by a temperature-sensitive p53 protein.

J Martinez1, I Georgoff, J Martinez

  • 1Department of Molecular Biology, Princeton University, New Jersey 08544-1014.

Genes & Development
|February 1, 1991
PubMed
Summary

A temperature-sensitive p53 mutant protein

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The tumor suppressor protein p53 plays a critical role in cell cycle regulation and apoptosis.
  • Mutations in p53 are common in human cancers, often leading to loss of function.
  • Understanding the behavior of mutant p53 is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the temperature-dependent conformational changes and cellular localization of a specific p53 mutant (p53val135).
  • To determine the effect of this p53 mutant on cell cycle progression in rat embryo fibroblasts.
  • To explore the interaction of wild-type and mutant p53 with hsc70 during the cell cycle.

Main Methods:

  • Transformation of primary rat embryo fibroblasts with a p53val135 mutant and ras.
  • Utilizing a monoclonal antibody (PAb246) to detect p53 conformation at different temperatures (32.5°C, 37°C, 39.5°C).
  • Cell cycle analysis using flow cytometry to assess cell cycle arrest.

Main Results:

  • The p53val135 mutant exhibits temperature-sensitive conformational changes, affecting PAb246 antibody binding.
  • At 39.5°C, mutant p53 localizes to the cytoplasm; at 32.5°C, it enters the nucleus and inhibits cell growth.
  • Cells arrest at the G1/S border at 32.5°C, with 91% in G1 after 48 hours.

Conclusions:

  • The conformational state and localization of the p53val135 mutant are critically dependent on temperature.
  • The mutant p53 protein can induce cell cycle arrest at the G1/S border when in its wild-type conformation.
  • Wild-type p53 forms a complex with hsc70 in the cytoplasm during G1, translocating to the nucleus during S-phase.

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