摘要
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 DAPKI-IRF7 and DAPKI-IRF3 interactions and overexpression of DAPK1 enhanced virus-induced activation of the interferon-stimulated response element （ISRE） and IFN-p promoters and the expression of the IFNB1 gene. Knockdown of DAPK1 attenuated the induction of IFNB1 and RIG.lexpression triggered by viral infection or I FN-p, and they were enhanced by viral replication. In addition, viral infection or IFN-p treatment induced the expression of DAPK1. IFN-p 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.
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 DAPKI-IRF7 and DAPKI-IRF3 interactions and overexpression of DAPK1 enhanced virus-induced activation of the interferon-stimulated response element （ISRE） and IFN-p promoters and the expression of the IFNB1 gene. Knockdown of DAPK1 attenuated the induction of IFNB1 and RIG.lexpression triggered by viral infection or I FN-p, and they were enhanced by viral replication. In addition, viral infection or IFN-p treatment induced the expression of DAPK1. IFN-p 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.
