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RIPK1 dephosphorylation and kinase activation by PPP1R3G/PP1γ promote apoptosis and necroptosis

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  • Jingchun Du

    (University of Texas Southwestern Medical Center
    Guangzhou Medical University)

  • Yougui Xiang

    (University of Texas Southwestern Medical Center
    Caris Life Sciences)

  • Hua Liu

    (University of Texas Southwestern Medical Center
    Jiangxi University of Chinese Medicine)

  • Shuzhen Liu

    (University of Texas Southwestern Medical Center)

  • Ashwani Kumar

    (University of Texas Southwestern Medical Center)

  • Chao Xing

    (University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center)

  • Zhigao Wang

    (University of Texas Southwestern Medical Center
    University of South Florida)

Abstract

Receptor-interacting protein kinase 1 (RIPK1) is a key regulator of inflammation and cell death. Many sites on RIPK1, including serine 25, are phosphorylated to inhibit its kinase activity and cell death. How these inhibitory phosphorylation sites are dephosphorylated is poorly understood. Using a sensitized CRISPR whole-genome knockout screen, we discover that protein phosphatase 1 regulatory subunit 3G (PPP1R3G) is required for RIPK1-dependent apoptosis and type I necroptosis. Mechanistically, PPP1R3G recruits its catalytic subunit protein phosphatase 1 gamma (PP1γ) to complex I to remove inhibitory phosphorylations of RIPK1. A PPP1R3G mutant which does not bind PP1γ fails to rescue RIPK1 activation and cell death. Furthermore, chemical prevention of RIPK1 inhibitory phosphorylations or mutation of serine 25 of RIPK1 to alanine largely restores cell death in PPP1R3G-knockout cells. Finally, Ppp1r3g−/− mice are protected from tumor necrosis factor-induced systemic inflammatory response syndrome, confirming the important role of PPP1R3G in regulating apoptosis and necroptosis in vivo.

Suggested Citation

  • Jingchun Du & Yougui Xiang & Hua Liu & Shuzhen Liu & Ashwani Kumar & Chao Xing & Zhigao Wang, 2021. "RIPK1 dephosphorylation and kinase activation by PPP1R3G/PP1γ promote apoptosis and necroptosis," Nature Communications, Nature, vol. 12(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27367-5
    DOI: 10.1038/s41467-021-27367-5
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