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Infection with a Brazilian isolate of Zika virus generates RIG‐I stimulatory RNA and the viral NS5 protein blocks type I IFN induction and signaling
European Journal of Immunology ( IF 4.5 ) Pub Date : 2018-04-06 , DOI: 10.1002/eji.201847483
Jonny Hertzog 1 , Antonio Gregorio Dias Junior 1 , Rachel E Rigby 1 , Claire L Donald 2 , Alice Mayer 1 , Erdinc Sezgin 1 , Chaojun Song 3 , Boquan Jin 3 , Philip Hublitz 4 , Christian Eggeling 1 , Alain Kohl 2 , Jan Rehwinkel 1
Affiliation  

Zika virus (ZIKV) is a major public health concern in the Americas. We report that ZIKV infection and RNA extracted from ZIKV infected cells potently activated the induction of type I interferons (IFNs). This effect was fully dependent on the mitochondrial antiviral signaling protein (MAVS), implicating RIG‐I‐like receptors (RLRs) as upstream sensors of viral RNA. Indeed, RIG‐I and the related RNA sensor MDA5 contributed to type I IFN induction in response to RNA from infected cells. We found that ZIKV NS5 from a recent Brazilian isolate blocked type I IFN induction downstream of RLRs and also inhibited type I IFN receptor (IFNAR) signaling. We defined the ZIKV NS5 nuclear localization signal and report that NS5 nuclear localization was not required for inhibition of signaling downstream of IFNAR. Mechanistically, NS5 blocked IFNAR signaling by both leading to reduced levels of STAT2 and by blocking phosphorylation of STAT1, two transcription factors activated by type I IFNs. Taken together, our observations suggest that ZIKV infection induces a type I IFN response via RLRs and that ZIKV interferes with this response by blocking signaling downstream of RLRs and IFNAR.

中文翻译:


感染巴西寨卡病毒分离株会产生 RIG-I 刺激性 RNA,病毒 NS5 蛋白会阻断 I 型 IFN 诱导和信号传导



寨卡病毒(ZIKV)是美洲的一个主要公共卫生问题。我们报告说,ZIKV 感染和从 ZIKV 感染细胞中提取的 RNA 有效激活了 I 型干扰素 (IFN) 的诱导。这种效应完全依赖于线粒体抗病毒信号蛋白(MAVS),表明 RIG-I 样受体(RLR)是病毒 RNA 的上游传感器。事实上,RIG-I 和相关的 RNA 传感器 MDA5 有助于响应感染细胞的 RNA 诱导 I 型 IFN。我们发现最近从巴西分离出来的 ZIKV NS5 阻断了 RLR 下游的 I 型 IFN 诱导,并抑制了 I 型 IFN 受体 (IFNAR) 信号传导。我们定义了 ZIKV NS5 核定位信号,并报告 NS5 核定位对于抑制 IFNAR 下游信号传导不是必需的。从机制上讲,NS5 通过降低 STAT2 水平和阻断 STAT1(两种由 I 型 IFN 激活的转录因子)磷酸化来阻断 IFNAR 信号传导。综上所述,我们的观察结果表明,ZIKV 感染通过RLR 诱导 I 型 IFN 反应,并且 ZIKV 通过阻断 RLR 和 IFNAR 下游信号传导来干扰这种反应。
更新日期:2018-04-06
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