Cited by 298PI3K/AKT/mTOR signaling in cancerRNA and protein synthesis mechanismsMetabolism, Diabetes, and Cancer

Regulation of eukaryotic initiation factor eIF2B: glycogen synthase kinase‐3 phosphorylates a conserved serine which undergoes dephosphorylation in response to insulin

Welsh, Gavin I, Miller, Christa M, Loughlin, A.Jane, Price, Nigel T·1998·FEBS Letters

Abstract

Eukaryotic initiation factor eIF2B catalyses a key regulatory step in mRNA translation. eIF2B and total protein synthesis are acutely activated by insulin, and this requires phosphatidylinositol 3‐kinase (PI 3‐kinase). The ϵ‐subunit of eIF2B is phosphorylated by glycogen synthase kinase‐3 (GSK‐3), which is inactivated by insulin in a PI 3‐kinase‐dependent manner. Here we identify the phosphorylation site in eIF2Bϵ as Ser 540 and show that treatment of eIF2B with GSK‐3 inhibits its activity. Ser 540 is phosphorylated in intact cells and undergoes dephosphorylation in response to insulin. This is blocked by PI 3‐kinase inhibitors. Insulin‐induced dephosphorylation of this inhibitory site in eIF2B seems likely to be important in the overall activation of translation by this hormone.

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Crossref · 10.1016/s0014-5793(97)01548-2

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39 of 39 references verified0 citation errors · 0 not checkable

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  • GSK-3β is a major regulator of protein synthesis through its actions on eIF2B.

    “It is also a major regulator of protein synthesis through its actions on eIF2B (568).”

    From Placental Origins of Chronic Disease (2016) · cites this paper as [568]

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Authors
Welsh, G. I., Miller, C. M., Loughlin, A. J., & Price, N. T.
Affiliations
  • University of Kent (GB)
  • University of Bristol (GB)
Venue
FEBS Letters
Publisher
Wiley
Published
1998-01-09
Volume
421
Issue
2
Pages
125-130
ISSN
  • 0014-5793 (ISSN-L)
  • 1873-3468
OpenAlex
W2057327606
Cited by
298
References
39
Citations by year
2026: 2 · 2025: 3 · 2024: 3 · 2023: 4 · 2022: 6 · 2021: 7 · 2020: 9 · 2019: 5 · 2018: 17 · 2017: 7 · 2016: 8 · 2015: 9 · 2014: 7 · 2013: 16 · 2012: 19
FWCI
5.23
Type
journal article
Language
en
Open access
closed
Locations
  • FEBS Letters (publishedVersion)
  • PubMed (publishedVersion)
  • Kent Academic Repository (University of Kent) (submittedVersion)
  • Open Research Online (The Open University) (submittedVersion)
Funders
Wellcome Trust
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
eIF2B, glycogen synthase kinase-3, dephosphorylation, insulin signaling, phosphatidylinositol 3-kinase, mRNA translation regulation, protein synthesis
MeSH terms
Amino Acid Sequence, Animals, Binding Sites, Cricetinae, Insulin, Molecular Sequence Data, Phosphorylation, Rabbits, Serine, Eukaryotic Initiation Factor-2, CHO Cells, Conserved Sequence, Calcium-Calmodulin-Dependent Protein Kinases, Glycogen Synthase Kinases, Glycogen Synthase Kinase 3

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