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• W2022131968 endingPage "4826" @default.
• W2022131968 startingPage "4815" @default.
• W2022131968 abstract "Serum- and glucocorticoid-inducible kinase 3 (SGK3) mediates a variety of cellular processes including membrane transport, cell proliferation, and survival, and it has been implicated in Akt-independent signaling downstream of oncogenic PIK3CA mutations (activating mutations in the α catalytic subunit of PI3K) in human cancers. However, the regulation of SGK3 is poorly understood. Here we report that SGK3 stability and kinase activation are regulated by the Hsp90-Cdc37 chaperone complex. Hsp90-Cdc37 associates with the kinase domain of SGK3 and acts in concert with a C-terminal hydrophobic motif of SGK3 to prevent Hsp70 association and ubiquitin ligase CHIP (C terminus of Hsc70-interacting protein)-mediated degradation. Phosphorylation of hydrophobic motif triggers release of Cdc37 and concomitant association of 3-phosphoinositide dependent kinase 1 (PDK1) to activate SGK3. Our study provides new insights into regulation of SGK3 stability and activation and the rationale for application of Hsp90 inhibitors in treating SGK3-dependent cancers. Serum- and glucocorticoid-inducible kinase 3 (SGK3) mediates a variety of cellular processes including membrane transport, cell proliferation, and survival, and it has been implicated in Akt-independent signaling downstream of oncogenic PIK3CA mutations (activating mutations in the α catalytic subunit of PI3K) in human cancers. However, the regulation of SGK3 is poorly understood. Here we report that SGK3 stability and kinase activation are regulated by the Hsp90-Cdc37 chaperone complex. Hsp90-Cdc37 associates with the kinase domain of SGK3 and acts in concert with a C-terminal hydrophobic motif of SGK3 to prevent Hsp70 association and ubiquitin ligase CHIP (C terminus of Hsc70-interacting protein)-mediated degradation. Phosphorylation of hydrophobic motif triggers release of Cdc37 and concomitant association of 3-phosphoinositide dependent kinase 1 (PDK1) to activate SGK3. Our study provides new insights into regulation of SGK3 stability and activation and the rationale for application of Hsp90 inhibitors in treating SGK3-dependent cancers." @default.
• W2022131968 created "2016-06-24" @default.
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• W2022131968 date "2014-02-01" @default.
• W2022131968 modified "2023-10-17" @default.
• W2022131968 title "Coordinated Regulation of Serum- and Glucocorticoid-inducible Kinase 3 by a C-terminal Hydrophobic Motif and Hsp90-Cdc37 Chaperone Complex" @default.
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• W2022131968 doi "https://doi.org/10.1074/jbc.m113.518480" @default.
• W2022131968 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3931044" @default.
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