Optineurin Negatively Regulates the Induction of IFNβ in Response to RNA Virus Infection

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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 IFNβ, which are pivotal for the initiation of an anti-viral state. Despite the essential role of IFNβ in the anti-viral response, there is an incomplete understanding of the negative regulation of IFNβ induction. Here we provide evidence that expression of the Nemo-related protein, optineurin (NRP/FIP2), has a role in the inhibition of virus-triggered IFNβ induction. Over-expression of optineurin inhibited Sendai-virus (SeV) and dsRNA triggered induction of IFNβ, whereas depletion of optineurin with siRNA promoted virus-induced IFNβ 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.

Vyšlo v časopise: Optineurin Negatively Regulates the Induction of IFNβ in Response to RNA Virus Infection. PLoS Pathog 6(2): e32767. doi:10.1371/journal.ppat.1000778
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1000778

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