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PRR5L degradation promotes mTORC2-mediated PKC-δ phosphorylation and cell migration downstream of Gα12

Mammalian target of rapamycin complex 2 (mTORC2) phosphorylates AGC protein kinases including protein kinase C (PKC) and regulates cellular functions such as cell migration. However, its regulation remains poorly understood. Here we show that lysophosphatidic acid (LPA) induces two phases of PKC-δ h...

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Hauptverfasser: Gan, Xiaoqing (VerfasserIn) , Offermanns, Stefan (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 20 May 2012
In: Nature cell biology
Year: 2012, Jahrgang: 14, Heft: 7, Pages: 686-696
ISSN:1476-4679
DOI:10.1038/ncb2507
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1038/ncb2507
Verlag, Volltext: https://www.nature.com/articles/ncb2507
Volltext
Verfasserangaben:Xiaoqing Gan, Jiyong Wang, Chen Wang, Eeva Sommer, Tohru Kozasa, Srinivasa Srinivasula, Dario Alessi, Stefan Offermanns, Melvin I. Simon and Dianqing Wu

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520 |a Mammalian target of rapamycin complex 2 (mTORC2) phosphorylates AGC protein kinases including protein kinase C (PKC) and regulates cellular functions such as cell migration. However, its regulation remains poorly understood. Here we show that lysophosphatidic acid (LPA) induces two phases of PKC-δ hydrophobic motif phosphorylation. The late phase is mediated by Gα12, which specifically activates ARAF, leading to upregulation of the RFFL E3 ubiquitin ligase and subsequent ubiquitylation and degradation of the PRR5L subunit of mTORC2. Destabilization of PRR5L, a suppressor of mTORC2-mediated hydrophobic motif phosphorylation of PKC-δ, but not AKT, results in PKC-δ hydrophobic motif phosphorylation and activation. This Gα12-mediated signalling pathway for mTORC2 regulation is critically important for fibroblast migration and pulmonary fibrosis development. 
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