Format

Send to

Choose Destination
Nat Cell Biol. 2018 Dec;20(12):1389-1399. doi: 10.1038/s41556-018-0229-6. Epub 2018 Nov 12.

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

Author information

1
Centre for Cell Death, Cancer and Inflammation (CCCI), UCL Cancer Institute, University College London, London, UK.
2
Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.
3
Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technical University Dresden, Dresden, Germany.
4
Proteomics Research Core Facility, UCL Cancer Institute, University College London, London, UK.
5
Bill Lyons Informatics Centre (BLIC), UCL Cancer Institute, University College London, London, UK.
6
Centre for Cell Death, Cancer and Inflammation (CCCI), UCL Cancer Institute, University College London, London, UK. h.walczak@ucl.ac.uk.

Abstract

The linear-ubiquitin chain assembly complex (LUBAC) modulates signalling via various immune receptors. In tumour necrosis factor (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. Here, we show that LUBAC activity enables TBK1 and IKKε recruitment to and activation at the TNF receptor 1 signalling complex (TNFR1-SC). While exerting only limited effects on TNF-induced gene activation, TBK1 and IKKε are essential to prevent TNF-induced cell death. Mechanistically, TBK1 and IKKε phosphorylate the kinase RIPK1 in the TNFR1-SC, thereby preventing RIPK1-dependent cell death. This activity is essential in vivo, as it prevents TNF-induced lethal shock. Strikingly, NEMO (also known as IKKγ), which mostly, but not exclusively, binds the TNFR1-SC via M1 ubiquitin, mediates the recruitment of the adaptors TANK and NAP1 (also known as AZI2). TANK is constitutively associated with both TBK1 and IKKε, while NAP1 is associated with TBK1. We discovered a previously unrecognized cell death checkpoint that is mediated by TBK1 and IKKε, and uncovered an essential survival function for NEMO, whereby it enables the recruitment and activation of these non-canonical IKKs to prevent TNF-induced cell death.

Comment in

PMID:
30420664
PMCID:
PMC6268100
DOI:
10.1038/s41556-018-0229-6
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center