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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Cotranslation of activated mutant p53 with wild type drives the wild-type p53 protein into the mutant conformation

J Milner1, E A Medcalf

  • 1Department of Pathology, University of Cambridge, England.

Cell
|May 31, 1991
PubMed

Insights

Mutant p53 proteins can alter wild-type p53 conformation during translation, potentially blocking tumor suppression. This dominant-negative effect is linked to protein interactions and oligomerization, influenced by cell growth signals.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Protein Conformation

Background:

  • Activating mutations in the p53 gene are frequently observed in various cancers, promoting tumor progression.
  • Wild-type p53 functions as a crucial tumor suppressor, regulating cell growth and preventing cancer development.
  • Mutant p53 proteins often adopt a distinct conformation, losing their tumor-suppressive capabilities.

Purpose of the Study:

  • To investigate the mechanism by which mutant p53 influences wild-type p53 conformation.
  • To explore the role of cotranslational effects and protein interactions in p53 conformational changes.
  • To understand how cell growth stimulation impacts p53 conformation.

Main Methods:

  • Analysis of p53 protein conformation during translation.
  • Investigating interactions between nascent p53 polypeptides.
  • Studying the oligomerization of full-length p53 proteins.
  • Observing conformational changes induced by cell growth stimulation.

Main Results:

  • Mutant p53 can induce a conformational change in cotranslated wild-type p53, leading to a dominant-negative effect.
  • This cotranslational influence is dependent on nascent polypeptide interactions and p53 oligomerization.
  • p53 protein oligomers can undergo cooperative conformational changes.
  • Cell growth stimulation can induce similar conformational changes in p53, suggesting allosteric regulation.

Conclusions:

  • Mutant p53 actively disrupts wild-type p53 function through cotranslational conformational modulation.
  • Protein-protein interactions and oligomerization are key mediators of this dominant-negative effect.
  • Allosteric regulation likely plays a role in p53 conformational shifts in response to cellular signals.

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