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• W2106565152 abstract "mTOR (mammalian target of rapamycin) responds to the presence of nutrients, energy and growth factors to link cellular metabolism, growth and proliferation. The rapamycin-sensitive mTORC (mTOR complex) 1 activates the translational regulator S6K (S6 kinase), leading to increased protein synthesis in the presence of nutrients. On the other hand, the rapamycin-insensitive mTORC2 responds to the presence of growth factors such as insulin by phosphorylating Akt to promote its maturation and allosteric activation. We recently found that mTORC2 can also regulate insulin signalling at the level of IRS-1 (insulin receptor substrate-1). Whereas mTORC1 promotes IRS-1 serine phosphorylation that is linked to IRS-1 down-regulation, we uncovered that mTORC2 mediates its degradation. In mTORC2-disrupted cells, inactive IRS-1 accumulated despite undergoing phosphorylation at the mTORC1-mediated serine sites. Defective IRS-1 degradation was due to attenuated expression of the CUL7 (Cullin 7) ubiquitin ligase substrate-targeting sub-unit Fbw8. mTORC2 and Fbw8 co-localize at the membrane where mTORC2 phosphorylates Ser86 to stabilize Fbw8 and promotes its cytosolic localization upon insulin stimulation. Under conditions of chronic insulin exposure, inactive serine-phosphorylated IRS-1 and Fbw8 co-localize to the cytosol where the former becomes ubiquitylated via CUL7/Fbw8. Thus mTORC2 negatively feeds back to IRS-1 via control of Fbw8 stability and localization. Our findings reveal that, in addition to persistent mTORC1 signalling, increased mTORC2 signals can promote insulin resistance due to mTORC2-mediated degradation of IRS-1." @default.
• W2106565152 created "2016-06-24" @default.
• W2106565152 creator A5001363689 @default.
• W2106565152 creator A5036299765 @default.
• W2106565152 date "2013-07-18" @default.
• W2106565152 modified "2023-09-27" @default.
• W2106565152 title "Regulation of insulin receptor substrate-1 by mTORC2 (mammalian target of rapamycin complex 2)" @default.
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• W2106565152 doi "https://doi.org/10.1042/bst20130018" @default.
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