PPM1B negatively regulates antiviral response via dephosphorylating TBK1.

PPM1B negatively regulates antiviral response via dephosphorylating TBK1.
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DOI:
10.1016/j.cellsig.2012.06.017
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发表时间:
2012-11
影响因子:
4.8
通讯作者:
Yang J
Yang J
中科院分区:
生物学2区
文献类型:
--
作者:
Zhao Y;Liang L;Fan Y;Sun S;An L;Shi Z;Cheng J;Jia W;Sun W;Mori-Akiyama Y;Zhang H;Fu S;Yang J

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I型干扰素的产生必须严格调节,并且I型干扰素的异常产生对宿主有害甚至致命。TBK1丝氨酸172位磷酸化在TBK1介导的抗病毒反应中起着重要作用。然而,TBK1活性如何受到负调控仍然知之甚少。使用功能基因组学方法,我们已经确定PPM1B作为TBK1磷酸酶。PPM1B在体内和体外使TBK1去磷酸化。PPM1B野生型而不是其磷酸酶缺陷型R179G突变体抑制TBK1介导的抗病毒反应,并促进VSV在细胞中的复制。病毒感染诱导PPM1B与TBK1在细胞中以瞬时方式结合。相反,PPM1B表达的抑制增强病毒诱导的IRF3磷酸化和IFNβ产生。我们的研究确定了一个以前未被认识的作用,PPM1B在负调控抗病毒反应作为TBK1磷酸酶。
The production of type I interferon must be tightly regulated and aberrant production of type I interferon is harmful or even fatal to the host. TBK1 phosphorylation at Ser172 plays an essential role in TBK1-mediated antiviral response. However, how TBK1 activity is negatively regulated remains poorly understood. Using a functional genomics approach, we have identified PPM1B as a TBK1 phosphatase. PPM1B dephosphorylates TBK1 in vivo and in vitro. PPM1B wild-type but not its phosphatase-deficient R179G mutant inhibits TBK1-mediated antiviral response and facilitates VSV replication in the cells. Viral infection induces association of PPM1B with TBK1 in a transient fashion in the cells. Conversely, suppression of PPM1B expression enhances virus-induced IRF3 phosphorylation and IFNβ production. Our study identifies a previously unrecognized role for PPM1B in the negative regulation of antiviral response by acting as a TBK1 phosphatase.
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