SIKE of black carp is a substrate of TBK1 and suppresses TBK1-mediated antiviral signaling.


:RIG-I like receptor (RLR) signaling functions importantly in host innate immune response against RNA virus, which is tightly regulated by a number of mechanisms to prevent aberrant interferon production. The suppressor of IKKε (SIKE) has been identified as a suppressor of IKKε and TBK1, which are key components of RLR signaling. In this study, SIKE homologue (bcSIKE) of black carp (Mylopharyngodon piceus) has been cloned and characterized. The transcription of bcSIKE varied in host cells in response to the stimulation of LPS, poly (I:C) and viruses. bcSIKE migrated around 27 KDa in immunoblot assay and distributed in both cytoplasm and nucleus of host cell in immunofluorescent (IF) staining test. bcSIKE showed no IFN-inducing ability in reporter assay and EPC cells expressing bcSIKE showed no enhanced antiviral ability against either grass carp reovirus (GCRV) or spring viremia of carp virus (SVCV). However, bcSIKE obviously dampened the IFN-inducing ability of RLR signaling members in reporter assay when bcSIKE was co-expressed with these molecules in EPC cells. The association between bcSIKE and bcTBK1 has been identified through IF and co-immunoprecipitation (co-IP) assay. The plaque assay demonstrated clearly that bcTBK1-mediated antiviral activity in EPC cells against both GCRV and SVCV was down regulated by bcSIKE. All the data generated in this paper support the conclusion that bcSIKE interacts with bcTBK1 and inhibits bcTBK1-mediated antiviral signaling during host innate immune activation, which is reported in teleost for the first time.


Dev Comp Immunol


Li J,Yan C,Liu J,Yan J,Feng H




Has Abstract


2019-01-01 00:00:00












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