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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

RNA-p53 interactions in vitro

Kasandra J-L Riley1, Marina Ramirez-Alvarado, L James Maher

  • 1Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.

Biochemistry
|February 10, 2007
PubMed

Insights

The tumor suppressor protein p53 binds RNA with its C-terminus, potentially regulating its DNA binding. Acetylation of p53

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Protein-RNA Interactions

Background:

  • The tumor suppressor protein p53 is frequently mutated in human cancers.
  • The intricate regulation of p53 function is not fully understood.
  • Previous studies have not extensively explored p53's interaction with RNA.

Purpose of the Study:

  • To investigate the specificity and functional implications of RNA binding by p53.
  • To determine the region of p53 responsible for RNA interaction.
  • To explore how post-translational modifications, like acetylation, affect RNA binding.

Main Methods:

  • Yeast three-hybrid system (Y3H) for initial detection of RNA binding.
  • Electrophoretic mobility shift assays (EMSA) to assess RNA binding affinity.
  • In vitro biochemical assays using p53 peptides.
  • Circular dichroism (CD) spectroscopy to analyze structural changes.

Main Results:

  • Full-length p53 binds RNA with low sequence specificity.
  • RNA binding by p53 inhibits its sequence-specific DNA binding activity.
  • The C-terminus of p53 is essential and sufficient for RNA interaction.
  • Acetylation of the p53 C-terminus prevents RNA binding.
  • RNA binding does not induce significant structural changes in p53 peptides or RNA.

Conclusions:

  • p53 directly binds RNA, and this interaction can modulate its DNA-binding function.
  • The C-terminal region of p53 mediates RNA interaction, which is sensitive to acetylation.
  • These findings suggest a novel regulatory mechanism for p53 involving RNA binding and post-translational modifications.

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