MAVS ubiquitination by the E3 ligase TRIM25 and degradation by the proteasome is involved in type I interferon production after activation of the antiviral RIG-I-like receptors

BMC Biology

Research Article

Dominique Garcin¹  Alain Portier²  Aimé Vazquez²  Céline Castanier²  Nicolas Bidère²  Damien Arnoult²  Naima Zemirli² 

[1] Department of Microbiology and Molecular Medicine, University of Geneva School of Medicine, 1 rue Michel-Servet, 1211, Geneva, Switzerland;INSERM UMR_S 1014, Hôpital Paul Brousse, Bâtiment Lavoisier, 14 avenue Paul Vaillant Couturier, 94807, Villejuif cedex, France;Université Paris-Sud P11, France;

关键词: MAVS;    RIG-I-like receptors;    TRIM25;    ubiquitination;   

DOI  :  10.1186/1741-7007-10-44

 received in 2012-03-23, accepted in 2012-05-24,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundDuring a viral infection, the intracellular RIG-I-like receptors (RLRs) sense viral RNA and signal through the mitochondrial antiviral signaling adaptor MAVS (also known as IPS-1, Cardif and VISA) whose activation triggers a rapid production of type I interferons (IFN) and of pro-inflammatory cytokines through the transcription factors IRF3/IRF7 and NF-κB, respectively. While MAVS is essential for this signaling and known to operate through the scaffold protein NEMO and the protein kinase TBK1 that phosphorylates IRF3, its mechanism of action and regulation remain unclear.ResultsWe report here that RLR activation triggers MAVS ubiquitination on lysine 7 and 10 by the E3 ubiquitin ligase TRIM25 and marks it for proteasomal degradation concomitantly with downstream signaling. Inhibition of this MAVS degradation with a proteasome inhibitor does not affect NF-κB signaling but it hampers IRF3 activation, and NEMO and TBK1, two essential mediators in type I IFN production, are retained at the mitochondria.ConclusionsThese results suggest that MAVS functions as a recruitment platform that assembles a signaling complex involving NEMO and TBK1, and that the proteasome-mediated MAVS degradation is required to release the signaling complex into the cytosol, allowing IRF3 phosphorylation by TBK1.

【 授权许可】

Unknown   
© Castanier et al; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.