Naslov
The Golgi apparatus acts as a platform for TBK1 activation after viral RNA sensing

Autori
Pourcelot, Marie ; Zemirli, Naima ; Silva Da Costa, Leandro ; Loyant, Roxane ; Garcin, Dominique ; Vitour, Damien ; Munitić, Ivana ; Vazquez, Aimé ; Arnoult, Damien

Izvornik
Bmc biology (1741-7007) 14 (2016); 69, 18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Golgi, viral infection, TBK1, optineurin

Sažetak
Background After viral infection and the stimulation of some pattern- recognition receptors, TANK-binding kinase I (TBK1) is activated by K63-linked polyubiquitination followed by trans- autophosphorylation. While the activated TBK1 induces type I interferon production by phosphorylating the transcription factor IRF3, the precise molecular mechanisms underlying TBK1 activation remain unclear. Results We report here the localization of the ubiquitinated and phosphorylated active form of TBK1 to the Golgi apparatus after the stimulation of RIG-I-like receptors (RLRs) or Toll-like receptor- 3 (TLR3), due to TBK1 K63-linked ubiquitination on lysine residues 30 and 401. The ubiquitin-binding protein optineurin (OPTN) recruits ubiquitinated TBK1 to the Golgi apparatus, leading to the formation of complexes in which TBK1 is activated by trans- autophosphorylation. Indeed, OPTN deficiency in various cell lines and primary cells impairs TBK1 targeting to the Golgi apparatus and its activation following RLR or TLR3 stimulation. Interestingly, the Bluetongue virus NS3 protein binds OPTN at the Golgi apparatus, neutralizing its activity and thereby decreasing TBK1 activation and downstream signaling. Conclusions Our results highlight an unexpected role of the Golgi apparatus in innate immunity as a key subcellular gateway for TBK1 activation after RNA virus infection.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA