Linear ubiquitin assembly complex negatively regulates RIG-I- and TRIM25-mediated type I interferon induction.

Linear ubiquitin assembly complex negatively regulates RIG-I- and TRIM25-mediated type I interferon induction.
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DOI:
10.1016/j.molcel.2010.12.029
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发表时间:
2011-02-04
期刊:
影响因子:
16
通讯作者:
Jung JU
Jung JU
中科院分区:
生物学1区
文献类型:
--
作者:
Inn KS;Gack MU;Tokunaga F;Shi M;Wong LY;Iwai K;Jung JU

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在检测病毒RNA后,视黄酸诱导基因I(RIG-I)经历了TRIM25介导的LYS-63连接的泛素化,从而导致I型Interferon(IFN)产生。在这项研究中,我们证明了线性的泛素组装络合物(LUBAC),由两个含环(RBR)含有E3 Ligases HOIL-1L和HOIP组成IFN生产。 HOIL-1L和HOIP的RBR E3连接酶结构域结合并诱导TRIM25的蛋白体降解,而HOIL-1L的NZF结构域则与TRIM25竞争RIG-I结合。因此,HOIL-1L/HOIP LUBAC的两种作用都有效抑制了rig-i泛素化和抗病毒活性,但以机械上的分离方式抑制了。相反,HOIL-1L和HOIP的遗传缺失或耗竭可增强病毒诱导的I型IFN产生。综上所述,HOIL-1L/HOIP LUBAC特异性抑制了RIG-I泛素化和激活,通过诱导TRIM25降解并抑制TRIM25与RIG-I的相互作用,从而全面抑制了IFN介导的抗病毒信号通路。
Upon detection of viral RNA, retinoic acid inducible gene I (RIG-I) undergoes TRIM25-mediated Lys-63 linked ubiquitination, leading to type-I interferon (IFN) production. In this study, we demonstrate that the linear ubiquitin assembly complex (LUBAC), comprised of two RING-IBR-RING (RBR)-containing E3 ligases HOIL-1L and HOIP, independently targets TRIM25 and RIG-I to effectively suppress virus-induced IFN production. RBR E3 ligase domains of HOIL-1L and HOIP bind and induce proteosomal degradation of TRIM25, whereas the NZF domain of HOIL-1L competes with TRIM25 for RIG-I binding. Consequently, both actions by the HOIL-1L/HOIP LUBAC potently inhibit RIG-I ubiquitination and anti-viral activity, but in a mechanistically separate manner. Conversely, the genetic deletion or depletion of HOIL-1L and HOIP robustly enhances virus-induced type-I IFN production. Taken together, the HOIL-1L/HOIP LUBAC specifically suppresses RIG-I ubiquitination and activation by inducing TRIM25 degradation and inhibiting TRIM25 interaction with RIG-I, resulting in the comprehensive suppression of the IFN-mediated anti-viral signaling pathway.
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