Ubiquitination and degradation of NF90 by Tim-3 inhibits antiviral innate immunity

Ubiquitination and degradation of NF90 by Tim-3 inhibits antiviral innate immunity
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Tim-3 泛素化和降解 NF90 抑制抗病毒先天免疫

DOI:
10.1101/2021.01.13.426507
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发表时间:
2021-01
期刊:
影响因子:
7.7
通讯作者:
Gencheng Han
Gencheng Han
中科院分区:
生物学1区
文献类型:
--
作者:
Shuaijie Dou;Guoxian Li;Ge Li;Yang Zheng;Chunmei Hou;Rongliang Mo;Lili Tang;Yang Gao;Yuxiang Li;Beifen Shen;Renxi Wang;Jun Zhang;Gencheng Han

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核因子90(NF 90)是一种新型的病毒感受器,通过触发应激颗粒(SG)的形成来启动抗病毒天然免疫。然而,NF 90-SGs通路的调节在很大程度上仍不清楚。我们发现,Tim-3,一种免疫检查点抑制剂,促进NF 90的泛素化和降解,并抑制NF 90-SGs介导的抗病毒免疫。水泡性口炎病毒(VSV)感染诱导巨噬细胞中Tim-3的上调和活化,这反过来将E3泛素连接酶TRIM 47募集到NF 90的锌指结构域,并通过K48连接的Lys 297处的泛素化启动NF 90的蛋白酶体依赖性降解。Tim-3的靶向失活通过选择性增加PKR和eIF 2a的磷酸化、SGs标志物G3 BP 1和TIA-1的表达来增强NF 90下游SGs的形成,并保护小鼠免受致死性VSV攻击。这些发现为了解Tim-3与抗病毒天然免疫中其他受体之间的串扰及其相关的临床意义提供了见解。
Nuclear Factor 90 (NF90) is a novel virus sensor that serves to initiate antiviral innate immunity by triggering the stress granules (SGs) formation. However, the regulation of the NF90-SGs pathway remain largely unclear. We found that Tim-3, an immune checkpoint inhibitor, promotes the ubiquitination and degradation of NF90 and inhibits NF90-SGs mediated antiviral immunity. Vesicular Stomatitis Virus (VSV) infection induces the up-regulation and activation of Tim-3 in macrophages which in turn recruited the E3 ubiquitin ligase TRIM47 to the zinc finger domain of NF90 and initiated a proteasome-dependent degradation of the NF90 via K48-linked ubiquitination at Lys297. Targeted inactivation of the Tim-3 enhances the NF90 downstream SGs formation by selectively increasing the phosphorylation of PKR and eIF2a, the expression of SGs markers G3BP1 and TIA-1, and protected mice from lethal VSV challenge. These findings provide insights into the crosstalk between Tim-3 and other receptors in antiviral innate immunity and its related clinical significance.
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