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Interferon (IFN) is required for protecting mice from viral pathogenesis; reciprocally, it mediates the deleterious septic shock response to bacterial infection. The critical transcription factor for IFN induction, in both cases, is IRF-3, which is activated by TLR3 or RIG-I signaling in response to virus infection and TLR4 signaling in response to bacterial infection. Here, we report that IRF-3's transcriptional activity required its coactivators, β-catenin and CBP, to be modified by HDAC6-mediated deacetylation and protein kinase C isozyme β (PKC-β)-mediated phosphorylation, respectively, so that activated nuclear IRF-3 could form a stable transcription initiation complex at the target gene promoters. β-Catenin bridges IRF-3 and CBP, and the modifications were required specifically for the interaction between β-catenin and CBP but not β-catenin and IRF-3. Consequently, like IRF-3(-/-) mice, HDAC6(-/-) mice were resistant to bacterial lipopolysaccharide-induced septic shock. Conversely, they were highly susceptible to pathogenesis caused by Sendai virus infection. Thus, HDAC6 is an essential component of the innate immune response to microbial infection.

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Inhibition of Viral Pathogenesis and Promotion of the Septic Shock Response to Bacterial Infection by IRF-3 Are Regulated by the Acetylation and Phosphorylation of Its Coactivators