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- W4311489370 abstract "The cytokine receptor-like factor 3 (Crlf3) belongs to the orphan class I cytokine receptors and is identified as a neuroprotective erythropoietin receptor. In previous studies of Crlf3, few focused on its role in innate immunity. Therefore, this study explored the regulatory role of Crlf3 in innate immunity. TANK-binding kinase 1 (TBK1) is a vital adaptor protein for the activation of the RLRs-MVAS-IRF3 antiviral signaling axis; thus, its expression and activity must be tightly regulated to maintain immune homeostasis and avoid undesirable effects. Here, we report that Crlf3 is a negative regulator of type I interferon production. The expression of Crlf3 is induced by poly(I·C) or Siniperca chuatsi rhabdovirus (SCRV) treatment. Silencing of Crlf3 enhanced poly(I·C)- and SCRV-induced type I interferon production, whereas overexpression of Crlf3 suppressed type I interferon production. Mechanistically, Crlf3 interacted with TBK1 via its N domain and then inhibited type I interferon production by promoting TBK1 proteasomal degradation through K48-linked polyubiquitination. Our study shows that Crlf3 is a key factor for viral escape from innate antiviral immunity in fish and provides a new perspective on mammalian resistance to viral invasion. IMPORTANCE The expression of Crlf3 was upregulated with SCRV invasion, which proved that Crlf3 was involved in the regulation of the antiviral immune response. In this study, we found that the existence of Crlf3 promoted the replication of SCRV. Therefore, it is reasonable to believe that SCRV evades innate immune attack with the assistance of Crlf3. In addition, we report that Crlf3 negatively regulates interferon (IFN) induction by promoting the degradation of TBK1 in fish. We showed that Crlf3 is evenly distributed in the cytoplasm and interacts with TBK1. Further studies showed that Crlf3 specifically mediates K48-linked ubiquitination of TBK1 and promotes TBK1 degradation, resulting in a marked inhibition of retinoic acid-inducible gene I (RIG-I) downstream signaling." @default.
- W4311489370 created "2022-12-26" @default.
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- W4311489370 date "2023-01-31" @default.
- W4311489370 modified "2023-10-14" @default.
- W4311489370 title "Cytokine Receptor-Like Factor 3 Negatively Regulates Antiviral Immunity by Promoting the Degradation of TBK1 in Teleost Fish" @default.
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- W4311489370 doi "https://doi.org/10.1128/jvi.01792-22" @default.
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