( DEAD)-box RNA helicase 3 modulates NF-kappa B signal pathway by controlling the phosphorylation of PP2A-C subunit

文献类型： 外文期刊

第一作者： Wang, Xin

作者： Wang, Xin;Wang, Rui;Luo, Miao;Li, Chen;Wang, Hua-Xia;Huan, Chang-Chao;Mao, Xiang;Qu, Yu-Rong;Liao, Ying;Mao, Xiang

作者机构：

关键词： (DEAD)-box RNA helicase 3;PP2A;NF-kappa B

期刊名称：ONCOTARGET （ 影响因子：5.168； 五年影响因子：5.312 ）

ISSN： 1949-2553

年卷期： 2017 年 8 卷 20 期

页码：

收录情况： SCI

摘要： Asp-Glu-Ala-Asp (DEAD)-box RNA helicase 3 (DDX3), an ATP-dependent RNA helicase, is associated with RNA splicing, mRNA export, transcription, translation, and RNA decay. Recent studies revealed that DDX3 participates in innate immune response during virus infection by interacting with TBK1 and regulating the production of IFN-beta. In our studies, we demonstrated that DDX3 regulated NF-kappa B signal pathway. We found that DDX3 knockdown reduced the phosphorylation of p65 and IKK-beta and ultimately attenuated the production of inflammatory cytokines induced by poly(I:C) or TNF-alpha stimulation. The regulatory effect of DDX3 on NF-kappa B signal pathway was not affected by the loss of its ATPase or helicase activity. We further identified PP2A C subunit (PP2A-C) as an interaction partner of DDX3 by co-immunoprecipitation and mass spectrum analysis. We confirmed that DDX3 formed the complex with PP2A-C/IKK-beta and regulated the interaction between IKK-beta and PP2A-C. Furthermore, we demonstrated that DDX3 modulated the activity of PP2A by controlling the phosphorylation of PP2A-C, which might enable PP2A-C to regulate NF-kappa B signal pathway by dephosphorylating IKK-beta. All these findings suggested DDX3 plays multiple roles in modulating innate immune system.

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