Optineurin negatively regulates the induction of IFNbeta in response to RNA virus infection.
| Autor: | Jamel Mankouri, Rennos Fragkoudis, Kathryn H Richards, Laura F Wetherill, Mark Harris, Alain Kohl, Richard M Elliott, Andrew Macdonald |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | PLoS Pathogens, Vol 6, Iss 2, p e1000778 (2010) |
| Druh dokumentu: | article |
| ISSN: | 1553-7366 1553-7374 |
| DOI: | 10.1371/journal.ppat.1000778 |
| Popis: | The innate immune response provides a critical defense against microbial infections, including viruses. These are recognised by pattern recognition receptors including Toll-like receptors (TLRs) and RIG-I like helicases (RLHs). Detection of virus triggers signalling cascades that induce transcription of type I interferons including IFNbeta, which are pivotal for the initiation of an anti-viral state. Despite the essential role of IFNbeta in the anti-viral response, there is an incomplete understanding of the negative regulation of IFNbeta induction. Here we provide evidence that expression of the Nemo-related protein, optineurin (NRP/FIP2), has a role in the inhibition of virus-triggered IFNbeta induction. Over-expression of optineurin inhibited Sendai-virus (SeV) and dsRNA triggered induction of IFNbeta, whereas depletion of optineurin with siRNA promoted virus-induced IFNbeta production and decreased RNA virus replication. Immunoprecipitation and immunofluorescence studies identified optineurin in a protein complex containing the antiviral protein kinase TBK1 and the ubiquitin ligase TRAF3. Furthermore, mutagenesis studies determined that binding of ubiquitin was essential for both the correct sub-cellular localisation and the inhibitory function of optineurin. This work identifies optineurin as a critical regulator of antiviral signalling and potential target for future antiviral therapy. |
| Databáze: | Directory of Open Access Journals |
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