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eIF4E activity is regulated at multiple levels.

B Raught1, A C Gingras

  • 1Department of Biochemistry, McGill University, Montreal, Quebec, Canada.

The International Journal of Biochemistry & Cell Biology
|April 27, 1999
PubMed
Summary
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Translation initiation is regulated by eukaryotic translation initiation factor 4E (eIF4E). This review details how eIF4E activity is controlled through transcriptional regulation, phosphorylation, and interactions with repressor proteins, impacting global translation rates.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Translation initiation is a key regulatory step in gene expression, involving the recruitment of ribosomes to mRNA.
  • The 5' cap structure (m7GpppN) of most eukaryotic mRNAs is crucial for this process, interacting with the cap-binding protein, eukaryotic translation initiation factor 4E (eIF4E).
  • eIF4E is a rate-limiting factor in translation and plays critical roles in cell cycle progression, apoptosis, and cell transformation.

Purpose of the Study:

  • To review the diverse regulatory mechanisms controlling the activity of eIF4E.
  • To elucidate how these regulatory mechanisms influence global translation rates and cellular processes.

Main Methods:

  • Literature review of studies on eIF4E regulation.
  • Analysis of structural data for eIF4E-cap interactions.

Related Experiment Videos

  • Discussion of signaling pathways involved in eIF4E and 4E-BP phosphorylation.

    • Main Results:

    • eIF4E activity is regulated at multiple levels: transcriptionally (as a target of c-myc), through phosphorylation (by MNK1, downstream of ERK and p38 MAPKs), and via interactions with 4E-binding proteins (4E-BPs).
    • Structural studies reveal insights into eIF4E-cap binding, suggesting phosphorylation may enhance mRNA affinity.
    • Phosphorylation of 4E-BPs by PI3K-dependent pathways (involving Akt/PKB and mTOR) relieves translational repression.

    Conclusions:

    • eIF4E is a central regulator of cap-dependent translation, with its activity finely tuned by a complex network of signaling pathways.
    • Understanding eIF4E regulation is crucial for comprehending cellular processes like proliferation and survival.
    • Dysregulation of eIF4E activity has implications for diseases such as cancer.