fr
Article scientifique
Accès libre
Anglais

Target of Rapamycin Complex 2 Regulates Actin Polarization and Endocytosis via Multiple Pathways

Publié dansJournal of Biological Chemistry, vol. 290, no. 24, p. 14963-14978
Date de publication2015
Résumé

Target of rapamycin is a Ser/Thr kinase that operates in two conserved multiprotein complexes, TORC1 and TORC2. Unlike TORC1, TORC2 is insensitive to rapamycin, and its functional characterization is less advanced. Previous genetic studies demonstrated that TORC2 depletion leads to loss of actin polarization and loss of endocytosis. To determine how TORC2 regulates these readouts, we engineered a yeast strain in which TORC2 can be specifically and acutely inhibited by the imidazoquinoline NVP-BHS345. Kinetic analyses following inhibition of TORC2, supported with quantitative phosphoproteomics, revealed that TORC2 regulates these readouts via distinct pathways as follows: rapidly through direct protein phosphorylation cascades and slowly through indirect changes in the tensile properties of the plasma membrane. The rapid signaling events are mediated in large part through the phospholipid flippase kinases Fpk1 and Fpk2, whereas the slow signaling pathway involves increased plasma membrane tension resulting from a gradual depletion of sphingolipids. Additional hits in our phosphoproteomic screens highlight the intricate control TORC2 exerts over diverse aspects of eukaryote cell physiology.

Mots-clés
  • Actins/metabolism
  • Endocytosis
  • Fungal Proteins/metabolism
  • Mechanistic Target of Rapamycin Complex 2
  • Multiprotein Complexes/physiology
  • Phosphorylation
  • Principal Component Analysis
  • Protein Kinases/metabolism
  • Proteomics
  • Saccharomyces cerevisiae/metabolism
  • Saccharomyces cerevisiae Proteins/metabolism
  • Signal Transduction
  • TOR Serine-Threonine Kinases/physiology
Groupe de recherche
Citation (format ISO)
RISPAL, Delphine et al. Target of Rapamycin Complex 2 Regulates Actin Polarization and Endocytosis via Multiple Pathways. In: Journal of Biological Chemistry, 2015, vol. 290, n° 24, p. 14963–14978. doi: 10.1074/jbc.M114.627794
Fichiers principaux (1)
Article (Published version)
accessLevelPublic
Identifiants
ISSN du journal0021-9258
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Création26/03/2018 11:35:00
Première validation26/03/2018 11:35:00
Heure de mise à jour15/03/2023 08:01:38
Changement de statut15/03/2023 08:01:37
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