Influenza virus adaptation PB2-627K modulates nucleocapsid inhibition by the pathogen sensor RIG-I.

Influenza virus adaptation PB2-627K modulates nucleocapsid inhibition by the pathogen sensor RIG-I.
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DOI:
10.1016/j.chom.2015.01.005
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发表时间:
2015-03-11
影响因子:
30.3
通讯作者:
Weber F
Weber F
中科院分区:
医学1区
文献类型:
--
作者:
Weber M;Sediri H;Felgenhauer U;Binzen I;Bänfer S;Jacob R;Brunotte L;García-Sastre A;Schmid-Burgk JL;Schmidt T;Hornung V;Kochs G;Schwemmle M;Klenk HD;Weber F

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细胞质RNA解旋酶RIG-I介导RNA病毒的先天感应。甲型流感病毒(FLUAV)的基因组被核蛋白包裹并与RNA聚合酶结合,对RIG-I传感造成潜在的障碍。我们表明,RIG-I识别FLUAV核衣壳上的5 '-三磷酸化dsRNA,但病毒聚合酶亚基PB 2的627位多态性调节RIG-I传感。相比于适应于大肠杆菌的PB 2 - 627 K,具有PB 2 - 627 E的禽类FLUAV核衣壳易于增加RIG-I识别,并且RIG-I缺陷部分恢复哺乳动物细胞的PB 2 - 627 E病毒感染。PB 2 - 627 E核衣壳的RIG-I感应增强与先前建立的含627 E的PB 2对核蛋白的较低亲和力相关,并且通过进一步的核衣壳不稳定性而增加。RIG-I对PB 2 - 627 E核衣壳的影响不依赖于抗病毒信号,这表明RIG-I-核衣壳单独结合可以抑制感染。这些结果表明,RIG-I是一种直接的禽流感病毒限制因子,并强调核衣壳破坏作为一种抗病毒策略。
The cytoplasmic RNA helicase RIG-I mediates innate sensing of RNA viruses. The genomes of influenza A virus (FLUAV) are encapsidated by the nucleoprotein and associated with RNA polymerase, posing potential barriers to RIG-I sensing. We show that RIG-I recognizes the 5’-triphosphorylated dsRNA on FLUAV nucleocapsids but that polymorphisms at position 627 of the viral polymerase subunit PB2 modulate RIG-I sensing. Compared to mammalian-adapted PB2-627K, avian FLUAV nucleocapsids possessing PB2-627E are prone to increased RIG-I recognition, and RIG-I-deficiency partially restores PB2-627E virus infection of mammalian cells. Heightened RIG-I sensing of PB2-627E nucleocapsids correlates with previously established lower affinity of 627E-containing PB2 for nucleoprotein and is increased by further nucleocapsid instability. The effect of RIG-I on PB2-627E nucleocapsids is independent of antiviral signaling, suggesting that RIG-I-nucleocapsid binding alone can inhibit infection. These results indicate that RIG-I is a direct avian FLUAV restriction factor and highlight nucleocapsid disruption as an antiviral strategy.
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