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Related Experiment Video

Updated: Jun 24, 2025

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
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eIF4E integrates into stress response.

Xincheng Wu1, Shu-Bing Qian1

  • 1Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA.

Molecular Cell
|June 7, 2024
PubMed
Summary

Depletion of eukaryotic initiation factor 4E (eIF4E) upregulates GCN4 translation independently of eIF2α phosphorylation. This reveals a novel mechanism for translational adaptation in cellular stress responses.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • The integrated stress response (ISR) is crucial for cellular adaptation to stress.
  • Translation regulation plays a key role in the ISR.
  • GCN4 is a central transcription factor in the ISR pathway.

Purpose of the Study:

  • To investigate the role of eukaryotic initiation factor 4E (eIF4E) in GCN4 translation.
  • To elucidate the mechanism of translational upregulation of GCN4.
  • To identify novel modes of translational adaptation.

Main Methods:

  • Investigating the effect of eIF4E depletion on GCN4 mRNA translation.
  • Analyzing the phosphorylation status of eIF2α under conditions of eIF4E depletion.
  • Utilizing molecular biology techniques to study protein synthesis and gene expression.

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Main Results:

  • Depletion of eIF4E leads to a significant translational upregulation of GCN4.
  • This upregulation occurs independently of eIF2α phosphorylation.
  • Suggests a novel pathway for controlling protein synthesis during stress.

Conclusions:

  • eIF4E plays a critical role in regulating GCN4 translation.
  • A new mode of translational adaptation exists that bypasses eIF2α phosphorylation.
  • Findings provide new insights into the integrated stress response.