PRR5L degradation promotes mTORC2-mediated PKC-δ phosphorylation and cell migration downstream of Gα(12)

Xiaoqing Gan, Jiyong Wang, Chen Wang, Eeva Sommer, Tohru Kozasa, Srinivasa Srinivasula, Dario Alessi, Stefan Offermanns, Melvin I. Simon, Dianqing Wu

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    88 Citations (Scopus)

    Abstract

    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-d hydrophobic motif phosphorylation. The late phase is mediated by Ga(12), 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-d, but not AKT, results in PKC-d hydrophobic motif phosphorylation and activation. This Ga(12)-mediated signalling pathway for mTORC2 regulation is critically important for fibroblast migration and pulmonary fibrosis development.
    Original languageEnglish
    JournalNature Cell Biology
    Early online date20 May 2012
    DOIs
    Publication statusPublished - 2012

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    Gan, X., Wang, J., Wang, C., Sommer, E., Kozasa, T., Srinivasula, S., Alessi, D., Offermanns, S., Simon, M. I., & Wu, D. (2012). PRR5L degradation promotes mTORC2-mediated PKC-δ phosphorylation and cell migration downstream of Gα(12). Nature Cell Biology. https://doi.org/10.1038/ncb2507