Unanchored K48-linked polyubiquitin synthesized by the E3-ubiquitin ligase TRIM6 stimulates the interferon-IKKε kinase-mediated antiviral response.

Unanchored K48-linked polyubiquitin synthesized by the E3-ubiquitin ligase TRIM6 stimulates the interferon-IKKε kinase-mediated antiviral response.
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DOI:
10.1016/j.immuni.2014.04.018
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发表时间:
2014-06-19
期刊:
影响因子:
32.4
通讯作者:
Garcia-Sastre, Adolfo
Garcia-Sastre, Adolfo
中科院分区:
医学1区
文献类型:
--
作者:
Rajsbaum, Ricardo;Versteeg, Gijs A.;Schmid, Sonja;Maestre, Ana M.;Belicha-Villanueva, Alan;Martinez-Romero, Carles;Patel, Jenish R.;Morrison, Juliet;Pisanelli, Giuseppe;Miorin, Lisa;Laurent-Rolle, Maudry;Moulton, Hong M.;Stein, David A.;Fernandez-Sesma, Ana;tenOever, Benjamin R.;Garcia-Sastre, Adolfo

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I型干扰素(IFN-1)是微生物感染时产生的必需的抗病毒细胞因子。IFN-I通过上调数百个IFN-I刺激基因(ISG)来增强这种活性。ISG诱导的整个范围需要激活许多细胞因子,包括IκB激酶β(IKKε)。然而,IKKε激活IFN受体信号转导的机制仍然难以捉摸。在这里,我们表明TRIM 6,E3-泛素连接酶三联基序(TRIM)蛋白家族的成员,与IKKε相互作用,并促进诱导IKKε依赖性ISGs。TRIM 6和E2-泛素缀合酶UbE 2K在未锚定的K48连接的多聚泛素链的合成中合作,其激活IKKε以进行随后的STAT 1磷酸化。我们的工作归因于K48连接的未锚定的多聚泛素链在激酶活化中的先前未被识别的活化作用,并确定UbE 2K-TRIM 6-泛素轴对于IFN信号传导和抗病毒应答至关重要。
Type-I interferons (IFN-I) are essential antiviral cytokines produced upon microbial infection. IFN-I elicits this activity through the upregulation of hundreds of IFN-I stimulated genes (ISGs). The full breadth of ISG induction demands activation of a number of cellular factors including the IκB kinase epsilon (IKKε). However, the mechanism of IKKε activation upon IFN receptor signaling has remained elusive. Here we show that TRIM6, a member of the E3-ubiquitin ligase tripartite motif (TRIM) family of proteins, interacts with IKKε and promotes induction of IKKε-dependent ISGs. TRIM6 and the E2-ubiquitin conjugase UbE2K cooperate in the synthesis of unanchored K48-linked poly-ubiquitin chains, which activate IKKε for subsequent STAT1 phosphorylation. Our work attributes a previously unrecognized activating role of K48-linked unanchored poly-ubiquitin chains in kinase activation and identifies the UbE2K-TRIM6-ubiquitin axis as critical for IFN signaling and antiviral response.
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