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Title

Reciprocal Regulation of Target of Rapamycin Complex 1 and Potassium Accumulation
Authors
Primo, Cecilia
Ferri-Blázquez, Alba
Loewith, Robbie Joséph
Yenush, Lynne
Published in Journal of Biological Chemistry. 2017, vol. 292, no. 2, p. 563-574
Abstract The proper maintenance of potassium homeostasis is crucial for cell viability. Among the major determinants of potassium uptake in the model organism Saccharomyces cerevisiae are the Trk1 high affinity potassium transporter and the functionally redundant Hal4 (Sat4) and Hal5 protein kinases. These kinases are required for the plasma membrane accumulation of not only Trk1 but also several nutrient permeases. Here, we show that overexpression of the target of rapamycin complex 1 (TORC1) effector NPR1 improves hal4 hal5 growth defects by stabilizing nutrient permeases at the plasma membrane. We subsequently found that internal potassium levels and TORC1 activity are linked. Specifically, growth under limiting potassium alters the activities of Npr1 and another TORC1 effector kinase, Sch9; hal4 hal5 and trk1 trk2 mutants display hypersensitivity to rapamycin, and reciprocally, TORC1 inhibition reduces potassium accumulation. Our results demonstrate that in addition to carbon and nitrogen, TORC1 also responds to and regulates potassium fluxes.
Keywords Cation Transport Proteins/genetics/metabolism — Intracellular Signaling Peptides and Proteins/genetics/metabolism — Mechanistic Target of Rapamycin Complex 1 — Multiprotein Complexes/genetics/metabolism — Potassium/metabolism — Protein Kinases/genetics — Protein-Serine-Threonine Kinases/genetics/metabolism — Saccharomyces cerevisiae/genetics/metabolism — Saccharomyces cerevisiae Proteins/genetics/metabolism — TOR Serine-Threonine Kinases/genetics/metabolism
Identifiers
PMID: 27895122
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Article (Published version) (1 MB) - public document Free access
Other version: http://www.jbc.org/content/292/2/563
Structures
Faculté des sciences / Section de biologie / Département de biologie moléculaire
Centres et instituts / Institut de génétique et de génomique
Research group Groupe Loewith
Citation
(ISO format) 		PRIMO, Cecilia et al. Reciprocal Regulation of Target of Rapamycin Complex 1 and Potassium Accumulation. In: Journal of Biological Chemistry, 2017, vol. 292, n° 2, p. 563-574. doi: 10.1074/jbc.M116.746982 https://archive-ouverte.unige.ch/unige:103220

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Deposited on : 2018-03-27

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