Abstract
Interferon regulatory factor (IRF) 7 has been demonstrated to be a master regulator of virus-induced type I interferon production (IFN), and it plays a central role in the innate immune response against viruses. Here, we identified death-associated protein kinase 1 (DAPK1) as an IRF7-interacting protein by tandem affinity purification (TAP). Viral infection induced DAPK1-IRF7 and DAPK1-IRF3 interactions and overexpression of DAPK1 enhanced virus-induced activation of the interferon-stimulated response element (ISRE) and IFN-β promoters and the expression of the IFNB1 gene. Knockdown of DAPK1 attenuated the induction of IFNB1 and RIG-I expression triggered by viral infection or IFN-β, and they were enhanced by viral replication. In addition, viral infection or IFN-β treatment induced the expression of DAPK1. IFN-β treatment also activated DAPK1 by decreasing its phosphorylation level at serine 308. Interestingly, the involvement of DAPK1 in virus-induced signaling was independent of its kinase activity. Therefore, our study identified DAPK1 as an important regulator of the cellular antiviral response.
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