The influenza virus PB2 protein evades antiviral innate immunity by inhibiting JAK1/STAT signalling.

The influenza virus PB2 protein evades antiviral innate immunity by inhibiting JAK1/STAT signalling.
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流感病毒PB2蛋白通过抑制JAK1/STAT信号传导逃避抗病毒先天免疫

DOI:
10.1038/s41467-022-33909-2
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发表时间:
2022-10-21
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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甲型流感病毒(IAV)聚合酶蛋白PB 2已显示通过阻断干扰素(IFN)的诱导而部分抑制宿主免疫应答。然而,调节IFN下游信号通路的IAV PB 2蛋白没有很好地表征。在这里,我们报告IAV PB 2蛋白降低细胞对IFN的敏感性,抑制STAT 1/STAT 2和ISGs的激活。此外,IAV PB 2蛋白靶向哺乳动物JAK 1的赖氨酸859和860处进行泛素化和降解。值得注意的是,在PB 2上具有I283 M/K526 R突变的高致病性禽流感病毒的H5亚型增加了降解哺乳动物JAK 1的能力,并在哺乳动物(但不是禽类)细胞和小鼠肺组织中表现出更高的复制效率,并在感染的小鼠中引起更高的死亡率。总之,这些数据描述了一个负调控机制,涉及PB 2-JAK 1,并提供了一个逃避策略,从宿主抗病毒免疫IAV采用的见解。流感病毒RNA聚合酶的PB 2亚基拮抗干扰素信号传导。在这里,作者从生物化学的角度研究了介导这种作用的分子相互作用,以及这种作用如何影响不同流感亚型背景下的病毒复制。
Influenza A virus (IAV) polymerase protein PB2 has been shown to partially inhibit the host immune response by blocking the induction of interferons (IFNs). However, the IAV PB2 protein that regulates the downstream signaling pathway of IFNs is not well characterized. Here, we report that IAV PB2 protein reduces cellular sensitivity to IFNs, suppressing the activation of STAT1/STAT2 and ISGs. Furthermore, IAV PB2 protein targets mammalian JAK1 at lysine 859 and 860 for ubiquitination and degradation. Notably, the H5 subtype of highly pathogenic avian influenza virus with I283M/K526R mutations on PB2 increases the ability to degrade mammalian JAK1 and exhibits higher replicate efficiency in mammalian (but not avian) cells and mouse lung tissues, and causes greater mortality in infected mice. Altogether, these data describe a negative regulatory mechanism involving PB2-JAK1 and provide insights into an evasion strategy from host antiviral immunity employed by IAV. The PB2 subunit of the RNA polymerase of influenza virus antagonizes interferon signalling. Here, the authors biochemically characterise the molecular interactions that mediate this, and how this impacts viral replication in the context of different influenza subtypes.
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