DDX1, DDX21, and DHX36 helicases form a complex with the adaptor molecule TRIF to sense dsRNA in dendritic cells.

DDX1, DDX21, and DHX36 helicases form a complex with the adaptor molecule TRIF to sense dsRNA in dendritic cells.
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DOI:
10.1016/j.immuni.2011.03.027
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发表时间:
2011-06-24
期刊:
影响因子:
32.4
通讯作者:
Liu YJ
Liu YJ
中科院分区:
医学1区
文献类型:
--
作者:
Zhang Z;Kim T;Bao M;Facchinetti V;Jung SY;Ghaffari AA;Qin J;Cheng G;Liu YJ

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先天免疫系统主要通过感知病毒核酸来检测病毒感染。我们报道了通过分离和测序髓系树突状细胞(MDCS)中的聚I:C结合蛋白,鉴定了由RNA解旋酶DDX1、DDX21和DHX36以及适配分子TRIF组成的病毒传感器。每个解旋酶或TRIF被shRNA敲除后,MDCS对Poly I:C、A型流感病毒和呼肠孤病毒的I型干扰素和细胞因子反应的能力被阻断。虽然DDX1通过其解旋酶A结构域与PolyI:C结合,但DHX36和DDX21分别通过它们的HA2-DUF和PRK结构域与TRIF的TIR结构域结合。该传感器定位于胞浆内,与内小体无关。因此,DDX1-DDX21-DHX36复合体代表了一种dsRNA传感器,它使用TRIF途径激活MDCS胞浆中的I型干扰素反应。
The innate immune system detects viral infection predominantly by sensing viral nucleic acids. We report the identification of a viral sensor, consisting of RNA helicases DDX1, DDX21, and DHX36, and the adaptor molecule TRIF, by isolation and sequencing of poly I:C-binding proteins in myeloid dendritic cells (mDCs). Knockdown of each helicase or TRIF by shRNA blocked the ability of mDCs to mount type I interferon (IFN) and cytokine responses to poly I:C, influenza A virus, and reovirus. Although DDX1 bound poly I:C via its Helicase A domain, DHX36 and DDX21 bound the TIR domain of TRIF via their HA2-DUF and PRK domains, respectively. This sensor was localized within the cytosol, independent of the endosomes. Thus, the DDX1-DDX21-DHX36 complex represents a dsRNA sensor that uses the TRIF pathway to activate type I IFN responses in the cytosol of mDCs.
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