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PLoS Genet. 2014 Feb 6;10(2):e1004113. doi: 10.1371/journal.pgen.1004113. eCollection 2014 Feb.

Serine- and threonine/valine-dependent activation of PDK and Tor orthologs converge on Sch9 to promote aging.

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Dipartimento di Biotecnologie Mediche e Forensi (DiBiMeF) Università di Palermo, Palermo, Italy.
Laboratoire de Biologie Moléculaire de la Cellule, Centre National de la Recherche Scientifique, Ecole Normale Supérieure de Lyon, Université de Lyon, Lyon, France.
Longevity Institute and Dept. of Biological Sciences School of Gerontology, University of Southern California, Los Angeles, California, United States of America.


Dietary restriction extends longevity in organisms ranging from bacteria to mice and protects primates from a variety of diseases, but the contribution of each dietary component to aging is poorly understood. Here we demonstrate that glucose and specific amino acids promote stress sensitization and aging through the differential activation of the Ras/cAMP/PKA, PKH1/2 and Tor/S6K pathways. Whereas glucose sensitized cells through a Ras-dependent mechanism, threonine and valine promoted cellular sensitization and aging primarily by activating the Tor/S6K pathway and serine promoted sensitization via PDK1 orthologs Pkh1/2. Serine, threonine and valine activated a signaling network in which Sch9 integrates TORC1 and Pkh signaling via phosphorylation of threonines 570 and 737 and promoted intracellular relocalization and transcriptional inhibition of the stress resistance protein kinase Rim15. Because of the conserved pro-aging role of nutrient and growth signaling pathways in higher eukaryotes, these results raise the possibility that similar mechanisms contribute to aging in mammals.

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