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Viral targeting of the interferon-beta-inducing Traf family member-associated NF-kappaB activator (TANK)-binding kinase-1

Official URL:https://doi.org/10.1073/pnas.0502883102
PubMed:View item in PubMed
Creators Name:Unterstab, G. and Ludwig, S. and Anton, A. and Planz, O. and Dauber, B. and Krappmann, D. and Heins, G. and Ehrhardt, C. and Wolff, T.
Journal Title:Proceedings of the National Academy of Sciences of the United States of America
Journal Abbreviation:Proc Natl Acad Sci U S A
Page Range:13640-13645
Date:9 September 2005
Keywords:Borna disease virus, Innate immunity, Animals, Dogs
Abstract:Expression of the antiviral cytokines IFN-α/β is among the most potent innate defenses of higher vertebrates to virus infections, which is controlled by the inducible transcription factor IFN regulatory factor (IRF)3. Borna disease virus (BDV) establishes persistent noncytolytic infections in animals and tissue culture cells, indicating that it can circumvent this antiviral reaction by an unexplained activity. In this study, we identify the BDV P protein as microbial gene product that associates with and inhibits the principal regulatory kinase of IRF3, Traf family member-associated NF-κB activator (TANK)-binding kinase 1 (TBK-1). We demonstrate that the P protein counteracts TBK-1-dependent IFN-{beta} expression in cells and, hence, the establishment of an antiviral state. Furthermore, our data show that the BDV P protein itself is phosphorylated by TBK-1, suggesting that P functions as a viral decoy substrate that prevents activation of cellular target proteins of TBK-1. Thus, our findings provide evidence for a previously undescribed mechanism by which a viral protein interferes with the induction of the antiviral IFN cascade.
Publisher:National Academy of Sciences (U.S.A.)
Item Type:Article

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