Vaccinia E5 is a major inhibitor of the DNA sensor cGAS.

Vaccinia E5 is a major inhibitor of the DNA sensor cGAS.
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DOI:
10.1038/s41467-023-38514-5
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发表时间:
2023-05-22
影响因子:
16.6
通讯作者:
Deng, Liang
Deng, Liang
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yang, Ning;Wang, Yi;Dai, Peihong;Li, Tuo;Zierhut, Christian;Tan, Adrian;Zhang, Tuo;Xiang, Jenny Zhaoying;Ordureau, Alban;Funabiki, Hironori;Chen, Zhijian;Deng, Liang

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DNA传感器环GMP-AMP合成酶(cGAS)在宿主抗病毒免疫中起关键作用。痘苗病毒(VACV)是一种大型细胞质DNA病毒,属于痘病毒科。痘苗病毒如何拮抗cgas介导的胞质dna感应途径尚不清楚。在这项研究中,我们筛选了80个痘苗基因,以鉴定干扰素基因刺激因子(STING)通路的潜在病毒抑制剂。我们发现牛痘E5是一种毒力因子和cGAS的主要抑制剂。在牛痘病毒(西部储备株)感染树突状细胞时,E5负责消除cGAMP的产生。E5定位于感染细胞的细胞质和细胞核。胞质E5通过与cGAS相互作用触发cGAS泛素化和蛋白酶体依赖性降解。从修饰痘苗病毒安卡拉(MVA)基因组中删除E5R基因可强烈诱导树突状细胞(DC)产生I型IFN,并促进DC成熟,从而改善抗原特异性T细胞反应。cGAS-STING信号通路在介导宿主抗病毒免疫中起关键作用。在这里,Yang等人筛选了痘苗病毒基因,通过介导cGAS泛素化和降解,鉴定并表征了病毒蛋白E5是cGAS的主要抑制剂。
The DNA sensor cyclic GMP-AMP synthase (cGAS) is critical in host antiviral immunity. Vaccinia virus (VACV) is a large cytoplasmic DNA virus that belongs to the poxvirus family. How vaccinia virus antagonizes the cGAS-mediated cytosolic DNA-sensing pathway is not well understood. In this study, we screened 80 vaccinia genes to identify potential viral inhibitors of the cGAS/Stimulator of interferon gene (STING) pathway. We discovered that vaccinia E5 is a virulence factor and a major inhibitor of cGAS. E5 is responsible for abolishing cGAMP production during vaccinia virus (Western Reserve strain) infection of dendritic cells. E5 localizes to the cytoplasm and nucleus of infected cells. Cytosolic E5 triggers ubiquitination of cGAS and proteasome-dependent degradation via interacting with cGAS. Deleting the E5R gene from the Modified vaccinia virus Ankara (MVA) genome strongly induces type I IFN production by dendritic cells (DCs) and promotes DC maturation, and thereby improves antigen-specific T cell responses. The cGAS-STING signalling pathway is critical in mediating host antiviral immunity. Here, Yang et al screen vaccinia viral genes to identify and then characterise that the viral protein E5 is a major inhibitor of cGAS by mediating cGAS ubiquitination and degradation.
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