2. Academic Validation
  3. LUBAC-Recruited CYLD and A20 Regulate Gene Activation and Cell Death by Exerting Opposing Effects on Linear Ubiquitin in Signaling Complexes

LUBAC-Recruited CYLD and A20 Regulate Gene Activation and Cell Death by Exerting Opposing Effects on Linear Ubiquitin in Signaling Complexes

  • Cell Rep. 2015 Dec 15;13(10):2258-72. doi: 10.1016/j.celrep.2015.11.009.
Peter Draber 1,  Sebastian Kupka 1,  Matthias Reichert 1,  Helena Draberova 1,  Elodie Lafont 1,  Diego de Miguel 1,  Lisanne Spilgies 1,  Silvia Surinova 1,  Lucia Taraborrelli 1,  Torsten Hartwig 1,  Eva Rieser 1,  Luigi Martino 2,  Katrin Rittinger 2,  Henning Walczak 3
Affiliations

Affiliations

  • 1 Centre for Cell Death, Cancer, and Inflammation (CCCI), UCL Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK.
  • 2 The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, London NW7 1AA, UK.
  • 3 Centre for Cell Death, Cancer, and Inflammation (CCCI), UCL Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK. Electronic address: [email protected].
PMID: 26670046 DOI: 10.1016/j.celrep.2015.11.009
Abstract

Ubiquitination and deubiquitination are crucial for assembly and disassembly of signaling complexes. LUBAC-generated linear (M1) ubiquitin is important for signaling via various immune receptors. We show here that the deubiquitinases CYLD and A20, but not OTULIN, are recruited to the TNFR1- and NOD2-associated signaling complexes (TNF-RSC and NOD2-SC), at which they cooperate to limit gene activation. Whereas CYLD recruitment depends on its interaction with LUBAC, but not on LUBAC's M1-chain-forming capacity, A20 recruitment requires this activity. Intriguingly, CYLD and A20 exert opposing effects on M1 chain stability in the TNF-RSC and NOD2-SC. While CYLD cleaves M1 chains, and thereby sensitizes cells to TNF-induced death, A20 binding to them prevents their removal and, consequently, inhibits cell death. Thus, CYLD and A20 cooperatively restrict gene activation and regulate cell death via their respective activities on M1 chains. Hence, the interplay between LUBAC, M1-ubiquitin, CYLD, and A20 is central for physiological signaling through innate immune receptors.

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