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Updated: Sep 27, 2026

Inducible and Reversible Dominant-negative (DN) Protein Inhibition
08:35

Inducible and Reversible Dominant-negative (DN) Protein Inhibition

Published on: January 7, 2019

[Dominant-negative inactivation of p53: the effect of the proportion between trans-dominant inhibitor and its target]

A A Morgunkova1, V P Almazov, S M Strunina

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia. morgunkova@yandex.ru

Molekuliarnaia Biologiia
|March 11, 2003
PubMed

Insights

Dominant-negative mutations in the p53 tumor suppressor gene can inactivate p53 function. The inhibitor GSE22 demonstrated reversible p53 inactivation, dependent on its concentration relative to p53.

Area of Science:

  • Molecular biology
  • Cancer genetics
  • Tumor suppressor genes

Context:

  • The p53 tumor suppressor gene plays a critical role in preventing cancer.
  • Dominant-negative mutations and p53 oligomerization are implicated in p53 functional inactivation.
  • The in vivo relevance of dominant-negative p53 inactivation in heterozygous tumor cells remains unclear.

Purpose:

  • To investigate the dominant-negative effect of the inhibitor GSE22 on p53 activity.
  • To determine the conditions under which GSE22 can inactivate p53 function.

Summary:

  • Cultures coexpressing GSE22 and tetracycline-suppressible p53 were generated from p53-negative cell lines.
  • Transcriptional activity and p53 expression were found to be dependent on the ratio of p53 to GSE22.
  • A multifold excess of GSE22 over p53 was required for the dominant-negative effect.
  • GSE22 was effective in achieving complete and reversible p53 inactivation.

Impact:

  • This study elucidates the concentration-dependent dominant-negative activity of GSE22 on p53.
  • GSE22 shows potential as a tool for reversible p53 inactivation in experimental systems.
  • Findings contribute to understanding p53 regulation in cancer biology.

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