DDX43 recruits TRIF or IPS-1 as an adaptor and activates the IFN-beta pathway in Nile tilapia (Oreochromis niloticus)

文献类型： 外文期刊

第一作者： Zhou, Xin

作者： Zhou, Xin;Gao, Fengying;Lu, Maixin;Liu, Zhigang;Wang, Miao;Cao, Jianmeng;Ke, Xiaoli;Yi, Mengmeng;Gao, Fengying;Lu, Maixin;Liu, Zhigang;Wang, Miao;Cao, Jianmeng;Ke, Xiaoli;Yi, Mengmeng;Zhou, Xin;Gao, Fengying;Lu, Maixin

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关键词： DDX43; Immune response; Nile tilapia (Oreochromis niloticus); Expression profile; IFN-beta activity

期刊名称：MOLECULAR IMMUNOLOGY （ 影响因子：4.174； 五年影响因子：4.24 ）

ISSN： 0161-5890

年卷期： 2022 年 143 卷

页码：

收录情况： SCI

摘要： DDX43 is one of the members of the DExD/H-box protein family, and emerging data suggest that it may play an important role in antiviral immunity across mammals. However, little is known about DDX43 in the fish immune response. In this study, we isolated the cDNA sequence of ddx43 in Nile tilapia (Oreochromis niloticus). The ddx43 gene was 2338 bp in length, contained an open reading frame (ORF) of 2064 bp and encoded a polypeptide of 687 amino acids. The predicted protein of OnDDX43 has three conserved domains, including the RNA binding domain KH, DEAD-like helicase superfamily DEXDc and C-terminal HELICc domain. In healthy Nile tilapia, the Onddx43 transcript was broadly expressed in all examined tissues, with the highest expression levels in the muscle and brain and the lowest in the liver. After challenge with Streptococcus agalactiae, lipopolysaccharides (LPS) and polyinosinic polycytidylic acid (Poly I:C), the expression level of Onddx43 mRNA was upregulated or downregulated in all of the tissues tested. Overexpression of OnDDX43 in 293 T cells showed that it has a positive regulatory effect on IFN-beta. The subcellular localization showed that OnDDX43 was expressed in the cytoplasm. We performed further pull-down assays and found that OnDDX43 interacted with both interferon-beta promoter stimulator1 (IPS-1) and TIR domain-containing adaptor inducing interferon-beta (TRIF).

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