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J Cell Sci. 2012 Dec 15;125(Pt 24):5955-9. doi: 10.1242/jcs.105395. Epub 2012 Oct 29.

Fission yeast TORC1 prevents eIF2α phosphorylation in response to nitrogen and amino acids via Gcn2 kinase.

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1
Instituto de Biología Molecular y Celular del Cáncer, CSIC/University of Salamanca, 37007 Salamanca, Spain.

Abstract

Serine 51 phosphorylation of the eukaryotic initiation factor-2α (eIF2α) is an important mechanism involved in blocking general protein synthesis in response to diverse types of stress. In fission yeast, three kinases (Hri1, Hri2 and Gcn2) can phosphorylate eIF2α at serine 51. In this study, we show that Tor2, as part of the TORC1 complex, prevents the phosphorylation of eIF2α in cells growing in the presence of nitrogen and amino acids. Inhibition of TORC1, either by rapamycin treatment, mutation of Tor2 or nitrogen deprivation, induces Gcn2-dependent phosphorylation of eIF2α.

PMID:
23108671
DOI:
10.1242/jcs.105395
[Indexed for MEDLINE]
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