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A decrease in cellular energy status stimulates PERK-dependent eIF2alpha phosphorylation and regulates protein

Edith Gomez1, Mike L Powell, Alan Bevington

  • 1Department of Cell Physiology and Pharmacology, Faculty of Medicine and Biological Sciences, The Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 9HN, UK.

The Biochemical Journal
|December 7, 2007
PubMed
Summary
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Low glucose activates PERK in pancreatic beta-cells, regulating protein synthesis via eukaryotic initiation factor 2alpha phosphorylation. This mechanism, linked to cellular energy status, impacts protein production.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Endocrinology

Background:

  • Pancreatic beta-cells regulate glucose homeostasis.
  • Protein synthesis is crucial for beta-cell function.
  • Glucose levels modulate cellular processes, including translation.

Purpose of the Study:

  • To elucidate the mechanism of eIF2alpha phosphorylation in pancreatic beta-cells under low glucose conditions.
  • To identify the key kinase involved in glucose-sensing protein synthesis regulation.
  • To investigate the role of PERK in mediating the cellular response to glucose deprivation.

Main Methods:

  • Overexpression of dominant-negative PERK and GADD34 mutants.
  • Measurement of total protein synthesis rates.
  • Polysome analysis to assess mRNA translation.

Related Experiment Videos

Main Results:

  • PERK (PKR-like endoplasmic reticulum kinase) is the primary mediator of eIF2alpha phosphorylation in response to decreased glucose.
  • PERK activation is linked to cellular energy status, independent of IRE1 or ER stress.
  • Inhibiting eIF2alpha phosphorylation increased protein synthesis by 53% and mobilized untranslated mRNAs.

Conclusions:

  • PERK activation by low glucose, driven by reduced energy status, is a novel mechanism regulating protein synthesis in beta-cells.
  • This pathway is critical for adapting protein synthesis to nutrient availability.
  • eIF2alpha dephosphorylation mobilizes mRNAs, enhancing translational efficiency.