Uncharged tRNA and sensing of amino acid deficiency in mammalian piriform cortex

Shuzhen Hao, James W. Sharp, Catherine M. Ross-Inta, Brent J. McDaniel, Tracy G. Anthony, Ronald C. Wek, Douglas R. Cavener, Barbara C. McGrath, John B. Rudell, Thomas J. Koehnle, Dorothy W. Gietzen

Research output: Contribution to journalArticle

241 Scopus citations

Abstract

Recognizing a deficiency of indispensable amino acids (IAAs) for protein synthesis is vital for dietary selection in metazoans, including humans. Cells in the brain's anterior piriform cortex (APC) are sensitive to IAA deficiency, signaling diet rejection and foraging for complementary IAA sources, but the mechanism is unknown. Here we report that the mechanism for recognizing IAA-deficient foods follows the conserved general control (GC) system, wherein uncharged transfer RNA induces phosphorylation of eukaryotic initiation factor 2 (eIF2) via the GC nonderepressing 2 (GCN2) kinase. Thus, a basic mechanism of nutritional stress management functions in mammalian brain to guide food selection for survival.

Original languageEnglish (US)
Pages (from-to)1776-1778
Number of pages3
JournalScience
Volume307
Issue number5716
DOIs
StatePublished - Mar 18 2005

ASJC Scopus subject areas

  • General

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