Related Experiment Video

Updated: Jun 17, 2025

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
08:47

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

3.1K

PPM1G dephosphorylates eIF4E in control of mRNA translation and cell proliferation

Peng Wang1,2, Zixian Li3, Sung-Hoon Kim1

  • 1Department of Biochemistry and Goodman Cancer Institute, McGill University, Montreal, Canada.

Life Science Alliance
|August 7, 2024
PubMed

Insights

Protein phosphatase PPM1G dephosphorylates eukaryotic translation initiation factor 4E (eIF4E), inhibiting cell proliferation. This finding reveals PPM1G

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The eukaryotic translation initiation factor 4E (eIF4E) regulates mRNA translation, impacting health and disease.
  • Phosphorylation of eIF4E by MNK kinases enhances translation of mRNAs encoding pro-tumorigenic proteins.
  • The phosphatases targeting eIF4E have been largely uncharacterized.

Purpose of the Study:

  • To identify the phosphatase responsible for dephosphorylating eIF4E.
  • To elucidate the mechanism by which this phosphatase regulates eIF4E activity and impacts cell proliferation.

Main Methods:

  • Biochemical assays to identify eIF4E phosphatase activity.
  • Analysis of protein-protein interactions to define binding motifs.
  • Cell proliferation assays to assess functional consequences.

Main Results:

  • PPM1G was identified as the primary phosphatase that dephosphorylates eIF4E.
  • PPM1G contains an eIF4E-binding motif similar to 4E-binding proteins (4E-BPs).
  • PPM1G inhibits cell proliferation by targeting phospho-eIF4E-dependent mRNA translation.

Conclusions:

  • PPM1G acts as a critical regulator of eIF4E activity.
  • PPM1G's phosphatase activity and binding motif contribute to the inhibition of cell proliferation.
  • Targeting the PPM1G-eIF4E interaction may offer therapeutic strategies for cancer.

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