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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

PHF20 is an effector protein of p53 double lysine methylation that stabilizes and activates p53

Gaofeng Cui1, Sungman Park, Aimee I Badeaux

  • 1Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA.

Nature Structural & Molecular Biology
|August 7, 2012
PubMed

Insights

PHF20 directly regulates p53, a crucial tumor suppressor. This protein stabilizes and activates p53 by binding to its methylated sites, enhancing the cellular response to DNA damage.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • PHF20 is a component of a lysine acetyltransferase complex.
  • Its precise role in regulating protein function, particularly p53, remains largely undefined.

Purpose of the Study:

  • To elucidate the function of PHF20 in the context of p53 regulation.
  • To investigate the molecular mechanisms by which PHF20 interacts with and modulates p53 activity.

Main Methods:

  • Biochemical assays
  • Biophysical techniques
  • Cellular experiments

Main Results:

  • PHF20 directly binds to p53, specifically recognizing p53 dimethylated at Lys370 or Lys382 via its Tudor domain.
  • PHF20 binding stabilizes p53 by inhibiting Mdm2-mediated ubiquitylation and degradation.
  • PHF20 enhances p53 levels and activation in response to DNA damage, leading to characteristic cellular phenotypes.

Conclusions:

  • PHF20 acts as a direct effector of p53 methylation.
  • PHF20 stabilizes and activates p53, highlighting its importance in the p53 pathway and cellular response to genotoxic stress.

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