TBK1 and IKKε prevent TNF-induced cell death by RIPK1 phosphorylation.

TBK1 and IKKε prevent TNF-induced cell death by RIPK1 phosphorylation.
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TBK1和IKKε预防TNF诱导的RIPK1磷酸化导致细胞死亡。

DOI:
10.1038/s41556-018-0229-6
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发表时间:
2018-12
影响因子:
21.3
通讯作者:
Walczak H
Walczak H
中科院分区:
生物学1区
文献类型:
--
作者:
Lafont E;Draber P;Rieser E;Reichert M;Kupka S;de Miguel D;Draberova H;von Mässenhausen A;Bhamra A;Henderson S;Wojdyla K;Chalk A;Surinova S;Linkermann A;Walczak H

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LUBAC通过多种免疫受体调节信号传导。在TNF信号传导中,线性(也称为M1)泛蛋白能够完全激活基因并防止细胞死亡。然而,细胞死亡预防的机制仍然不明确。我们发现,LUBAC活性使TBK 1和IKKε能够募集到TNFR 1信号复合物(TNFR 1-SC)并在TNFR 1信号复合物(TNFR 1-SC)处活化。虽然TBK 1/IKKε对TNF诱导的基因激活作用有限,但对于防止TNF诱导的细胞死亡至关重要。在机制上,TBK 1/IKKε磷酸化TNFR 1-SC中的RIPK 1,从而防止RIPK 1激酶活性依赖性细胞死亡。这种活性在体内是必需的,因为它防止TNF诱导的致死性休克。引人注目的是,NEMO/IKKγ主要但不完全通过M1-泛素与TNFR 1-SC结合,介导分别与TBK 1/IKKε和TBK 1组成性相关的衔接子TANK和NAP 1/AZI 2的募集。我们在这里发现了一个以前未被识别的TBK 1/IKKε介导的细胞死亡检查点,并通过招募和激活这些非经典IKK来防止TNF诱导的细胞死亡,揭示了NEMO的基本生存功能。
LUBAC modulates signalling by various immune receptors. In TNF signalling, linear (also known as M1) ubiquitin enables full gene-activation and prevents cell death. However, the mechanisms underlying cell-death prevention remain ill-defined. We show that LUBAC activity enables TBK1 and IKKε recruitment to and activation at the TNFR1-signalling complex (TNFR1-SC). Whilst exerting only limited effects on TNF-induced gene-activation, TBK1/IKKε are essential to prevent TNF-induced cell death. Mechanistically, TBK1/IKKε phosphorylate RIPK1 in the TNFR1-SC, thereby preventing RIPK1-kinase-activity-dependent cell death. This activity is essential in vivo, as it prevents TNF-induced lethal shock. Strikingly, NEMO/IKKγ, which mostly, but not exclusively, binds to the TNFR1-SC via M1-ubiquitin, mediates recruitment of the adaptors TANK and NAP1/AZI2 which are constitutively associated with TBK1/IKKε and TBK1, respectively. We here discover a previously unrecognised TBK1/IKKε-mediated cell-death checkpoint and uncover an essential survival function for NEMO by enabling recruitment and activation of these noncanonical IKKs to prevent TNF-induced cell death.
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