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Cold Spring Harb Perspect Biol. 2018 Jul 2;10(7). pii: a032870. doi: 10.1101/cshperspect.a032870.

Role of eIF2α Kinases in Translational Control and Adaptation to Cellular Stress.

Author information

1
Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202-5126.

Abstract

A central mechanism regulating translation initiation in response to environmental stress involves phosphorylation of the α subunit of eukaryotic initiation factor 2 (eIF2α). Phosphorylation of eIF2α causes inhibition of global translation, which conserves energy and facilitates reprogramming of gene expression and signaling pathways that help to restore protein homeostasis. Coincident with repression of protein synthesis, many gene transcripts involved in the stress response are not affected or are even preferentially translated in response to increased eIF2α phosphorylation by mechanisms involving upstream open reading frames (uORFs). This review highlights the mechanisms regulating eIF2α kinases, the role that uORFs play in translational control, and the impact that alteration of eIF2α phosphorylation by gene mutations or small molecule inhibitors can have on health and disease.

PMID:
29440070
DOI:
10.1101/cshperspect.a032870
[Indexed for MEDLINE]

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