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

Published on: August 4, 2019

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p32 is a negative regulator of p53 tetramerization and transactivation

Nikhil Baban Ghate1, Jinman Kim1, Yonghwan Shin1

  • 1Department of Biochemistry and Molecular Medicine, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA.

Molecular Oncology
|July 12, 2019
PubMed

Insights

The protein p32 negatively regulates the tumor suppressor p53 by blocking its DNA binding and promoting its degradation. This finding reveals p32 as a potential therapeutic target for cancer treatment.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Biochemistry

Background:

  • p53 is a crucial tumor suppressor that regulates cell cycle arrest and apoptosis.
  • Dysregulation of p53 activity is common in cancer.
  • p32 is a multifunctional protein known to interact with various viral and cellular proteins.

Purpose of the Study:

  • To investigate the effect of p32 on p53 transcriptional activity.
  • To elucidate the mechanism by which p32 influences p53 function.
  • To assess the potential of targeting p32 in cancer therapy.

Main Methods:

  • Assessing p53 transactivation in the presence of p32.
  • Analyzing p53 binding to target gene response elements.
  • Investigating the interaction between p32 and the p53 tetramerization domain.
  • Evaluating the impact of p32 on p53 nuclear export and degradation.

Main Results:

  • p32 attenuates p53-dependent transcription.
  • p32 impairs p53 binding to its response elements.
  • p32 interacts with the p53 tetramerization domain, blocking tetramerization.
  • p32 enhances p53 nuclear export and degradation, leading to reduced p53 transactivation.

Conclusions:

  • p32 acts as a negative regulator of p53 tumor-suppressive functions.
  • p32 inhibits p53 by disrupting its DNA binding and promoting its degradation.
  • Targeting p32 may offer a novel therapeutic strategy for cancer treatment.
Keywords:
nuclear export signalp32p53tetramerizationtranscription

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