Article ; Online: WNK1 is a chloride-stimulated scaffold that regulates mTORC2 activity and ion transport.
2022 Volume 135, Issue 23
Abstract: Mammalian (or mechanistic) target of rapamycin complex 2 (mTORC2) is a kinase complex that targets predominantly Akt family proteins, SGK1 and protein kinase C (PKC), and has well-characterized roles in mediating hormone and growth factor effects on a ... ...
Abstract | Mammalian (or mechanistic) target of rapamycin complex 2 (mTORC2) is a kinase complex that targets predominantly Akt family proteins, SGK1 and protein kinase C (PKC), and has well-characterized roles in mediating hormone and growth factor effects on a wide array of cellular processes. Recent evidence suggests that mTORC2 is also directly stimulated in renal tubule cells by increased extracellular K+ concentration, leading to activation of the Na+ channel, ENaC, and increasing the electrical driving force for K+ secretion. We identify here a signaling mechanism for this local effect of K+. We show that an increase in extracellular [K+] leads to a rise in intracellular chloride (Cl-), which stimulates a previously unknown scaffolding activity of the protein 'with no lysine-1' (WNK1) kinase. WNK1 interacts selectively with SGK1 and recruits it to mTORC2, resulting in enhanced SGK1 phosphorylation and SGK1-dependent activation of ENaC. This scaffolding effect of WNK1 is independent of its own kinase activity and does not cause a generalized stimulation of mTORC2 kinase activity. These findings establish a novel WNK1-dependent regulatory mechanism that harnesses mTORC2 kinase activity selectively toward SGK1 to control epithelial ion transport and electrolyte homeostasis. |
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MeSH term(s) | Animals ; Mechanistic Target of Rapamycin Complex 2/metabolism ; Immediate-Early Proteins/genetics ; Immediate-Early Proteins/metabolism ; Chlorides/metabolism ; Epithelial Sodium Channels/genetics ; Epithelial Sodium Channels/metabolism ; Protein Serine-Threonine Kinases ; TOR Serine-Threonine Kinases/metabolism ; Ion Transport ; Minor Histocompatibility Antigens/genetics ; Minor Histocompatibility Antigens/metabolism ; Mammals/metabolism |
Chemical Substances | Mechanistic Target of Rapamycin Complex 2 (EC 2.7.11.1) ; Immediate-Early Proteins ; Chlorides ; Epithelial Sodium Channels ; Protein Serine-Threonine Kinases (EC 2.7.11.1) ; TOR Serine-Threonine Kinases (EC 2.7.11.1) ; Minor Histocompatibility Antigens |
Language | English |
Publishing date | 2022-12-05 |
Publishing country | England |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2993-2 |
ISSN | 1477-9137 ; 0021-9533 |
ISSN (online) | 1477-9137 |
ISSN | 0021-9533 |
DOI | 10.1242/jcs.260313 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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