RNF39 mediates K48-linked ubiquitination of DDX3X and inhibits RLR-dependent antiviral immunity.

RNF39 mediates K48-linked ubiquitination of DDX3X and inhibits RLR-dependent antiviral immunity.
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RNF39 介导 DDX3X 的 K48 连接泛素化并抑制 RLR 依赖性抗病毒免疫

DOI:
10.1126/sciadv.abe5877
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发表时间:
2021-03
期刊:
影响因子:
13.6
通讯作者:
Zhao W
Zhao W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang W;Jia M;Zhao C;Yu Z;Song H;Qin Y;Zhao W

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E3泛素连接酶控制DDX 3X泛素化和稳定性,因此抑制TLR依赖性抗病毒反应。视黄酸诱导基因-I(RIG-I)样受体(RLR)是主要的胞质RNA感受器,在启动抗病毒先天免疫中起关键作用。此外,RLR与多种自身免疫性疾病有关。因此,应严格控制RLR激活以避免有害影响。“X-连接的DEAD-box RNA解旋酶3”(DDX 3X)是RLR信号传导中的关键衔接子,但其调控机制尚不清楚。在这里,我们发现E3泛素连接酶RNF 39通过介导K48连接的泛素化和DDX 3X的蛋白酶体降解来抑制RLR途径。一致地,Rnf 39缺陷增强RNA病毒触发的先天免疫应答并减弱病毒复制。因此,我们的研究结果揭示了一个以前未知的机制,控制DDX 3X的活动,并建议RNF 39作为一个启动干预目标的异常RLR激活引起的疾病。
An E3 ubiquitin ligase controls DDX3X ubiquitination and stability and therefore suppresses RLR-dependent antiviral responses. Retinoic acid–inducible gene-I (RIG-I)–like receptors (RLRs) are major cytosolic RNA sensors and play crucial roles in initiating antiviral innate immunity. Furthermore, RLRs have been implicated in multiple autoimmune disorders. Thus, RLR activation should be tightly controlled to avoid detrimental effects. “DEAD-box RNA helicase 3, X-linked” (DDX3X) is a key adaptor in RLR signaling, but its regulatory mechanisms remain unknown. Here, we show that the E3 ubiquitin ligase RNF39 inhibits RLR pathways through mediating K48-linked ubiquitination and proteasomal degradation of DDX3X. Concordantly, Rnf39 deficiency enhances RNA virus–triggered innate immune responses and attenuates viral replication. Thus, our results uncover a previously unknown mechanism for the control of DDX3X activity and suggest RNF39 as a priming intervention target for diseases caused by aberrant RLR activation.
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