Serveur d'exploration sur la rapamycine et les champignons

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A role for TOR complex 2 signaling in promoting autophagy.

Identifieur interne : 000F30 ( Main/Exploration ); précédent : 000F29; suivant : 000F31

A role for TOR complex 2 signaling in promoting autophagy.

Auteurs : Ariadne Vlahakis [États-Unis] ; Ted Powers

Source :

RBID : pubmed:25426890

Descripteurs français

English descriptors

Abstract

The conserved target of rapamycin (TOR) kinase is a central regulator of cell growth in response to nutrient availability. TOR forms 2 structurally and functionally distinct complexes, TORC1 and TORC2, and negatively regulates autophagy via TORC1. Here we demonstrate TOR also operates independently through the TORC2 signaling pathway to promote autophagy upon amino acid limitation. Under these conditions, TORC2, through its downstream target kinase Ypk1, inhibits the Ca(2+)- and Cmd1/calmodulin-dependent phosphatase, calcineurin, to enable the activation of the amino acid-sensing EIF2S1/eIF2α kinase, Gcn2, and promote autophagy. Thus TORC2 signaling regulates autophagy in a pathway distinct from TORC1 to provide a tunable response to the cellular metabolic state.

DOI: 10.4161/auto.36262
PubMed: 25426890
PubMed Central: PMC4502789


Affiliations:


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Le document en format XML

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<title xml:lang="en">A role for TOR complex 2 signaling in promoting autophagy.</title>
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<name sortKey="Vlahakis, Ariadne" sort="Vlahakis, Ariadne" uniqKey="Vlahakis A" first="Ariadne" last="Vlahakis">Ariadne Vlahakis</name>
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<nlm:affiliation>a Department of Molecular and Cellular Biology; College of Biological Sciences ; University of California, Davis ; Davis , CA USA.</nlm:affiliation>
<country>États-Unis</country>
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<wicri:cityArea>a Department of Molecular and Cellular Biology; College of Biological Sciences ; University of California, Davis ; Davis </wicri:cityArea>
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<name sortKey="Powers, Ted" sort="Powers, Ted" uniqKey="Powers T" first="Ted" last="Powers">Ted Powers</name>
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<term>Amino Acids (chemistry)</term>
<term>Autophagy (MeSH)</term>
<term>Calcineurin (metabolism)</term>
<term>Calcium (chemistry)</term>
<term>Calcium (metabolism)</term>
<term>Disease Progression (MeSH)</term>
<term>Glycogen Synthase Kinase 3 (metabolism)</term>
<term>Mechanistic Target of Rapamycin Complex 1 (MeSH)</term>
<term>Mechanistic Target of Rapamycin Complex 2 (MeSH)</term>
<term>Multiprotein Complexes (metabolism)</term>
<term>Nitrogen (chemistry)</term>
<term>Saccharomyces cerevisiae (metabolism)</term>
<term>Saccharomyces cerevisiae Proteins (metabolism)</term>
<term>Signal Transduction (MeSH)</term>
<term>TOR Serine-Threonine Kinases (metabolism)</term>
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<keywords scheme="KwdFr" xml:lang="fr">
<term>Acides aminés (composition chimique)</term>
<term>Autophagie (MeSH)</term>
<term>Azote (composition chimique)</term>
<term>Calcineurine (métabolisme)</term>
<term>Calcium (composition chimique)</term>
<term>Calcium (métabolisme)</term>
<term>Complexe-1 cible mécanistique de la rapamycine (MeSH)</term>
<term>Complexe-2 cible mécanistique de la rapamycine (MeSH)</term>
<term>Complexes multiprotéiques (métabolisme)</term>
<term>Glycogen Synthase Kinase 3 (métabolisme)</term>
<term>Protéines de Saccharomyces cerevisiae (métabolisme)</term>
<term>Saccharomyces cerevisiae (métabolisme)</term>
<term>Sérine-thréonine kinases TOR (métabolisme)</term>
<term>Transduction du signal (MeSH)</term>
<term>Évolution de la maladie (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en">
<term>Amino Acids</term>
<term>Calcium</term>
<term>Nitrogen</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Calcineurin</term>
<term>Calcium</term>
<term>Glycogen Synthase Kinase 3</term>
<term>Multiprotein Complexes</term>
<term>Saccharomyces cerevisiae Proteins</term>
<term>TOR Serine-Threonine Kinases</term>
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<term>Acides aminés</term>
<term>Azote</term>
<term>Calcium</term>
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<term>Saccharomyces cerevisiae</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Calcineurine</term>
<term>Calcium</term>
<term>Complexes multiprotéiques</term>
<term>Glycogen Synthase Kinase 3</term>
<term>Protéines de Saccharomyces cerevisiae</term>
<term>Saccharomyces cerevisiae</term>
<term>Sérine-thréonine kinases TOR</term>
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<term>Autophagy</term>
<term>Disease Progression</term>
<term>Mechanistic Target of Rapamycin Complex 1</term>
<term>Mechanistic Target of Rapamycin Complex 2</term>
<term>Signal Transduction</term>
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<term>Autophagie</term>
<term>Complexe-1 cible mécanistique de la rapamycine</term>
<term>Complexe-2 cible mécanistique de la rapamycine</term>
<term>Transduction du signal</term>
<term>Évolution de la maladie</term>
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<div type="abstract" xml:lang="en">The conserved target of rapamycin (TOR) kinase is a central regulator of cell growth in response to nutrient availability. TOR forms 2 structurally and functionally distinct complexes, TORC1 and TORC2, and negatively regulates autophagy via TORC1. Here we demonstrate TOR also operates independently through the TORC2 signaling pathway to promote autophagy upon amino acid limitation. Under these conditions, TORC2, through its downstream target kinase Ypk1, inhibits the Ca(2+)- and Cmd1/calmodulin-dependent phosphatase, calcineurin, to enable the activation of the amino acid-sensing EIF2S1/eIF2α kinase, Gcn2, and promote autophagy. Thus TORC2 signaling regulates autophagy in a pathway distinct from TORC1 to provide a tunable response to the cellular metabolic state. </div>
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<Title>Autophagy</Title>
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<Keyword MajorTopicYN="N">TOR</Keyword>
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<Keyword MajorTopicYN="N">TORC2</Keyword>
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