Defining the functional determinants for RNA surveillance by RIG-I.

Defining the functional determinants for RNA surveillance by RIG-I.
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DOI:
10.1038/embor.2013.108
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发表时间:
2013-09
期刊:
影响因子:
7.7
通讯作者:
Pyle, Anna Marie
Pyle, Anna Marie
中科院分区:
生物学2区
文献类型:
--
作者:
Kohlway, Andrew;Luo, Dahai;Rawling, David C.;Ding, Steve C.;Pyle, Anna Marie

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视黄酸诱导基因-I(RIG-I)是细胞内的RNA传感器,其响应于RNA病毒的感染而激活先天性免疫机制。在这里,我们报告了RIG-I:dsRNA复合物的不同构象的晶体结构,这表明HEL 2 i介导的扫描允许RIG-I感测RNA靶的长度。为了理解HEL 2 i扫描RIG-I的催化活性和信号传导的意义,我们检测了不同长度和5′组成的双链RNA刺激时其ATP酶活性。我们确定了一个最小的RNA双链体,结合一个RIG-I分子,刺激强大的ATP酶活性,并在细胞中激发RIG-I介导的干扰素反应。我们的研究结果表明,RIG-I:RNA复合物的最小功能单位是一个单体,结合在双链体RNA底物的末端。这种行为与RIG-I旁系同源黑色素瘤分化相关基因5(MDA 5)显着不同,后者形成合作细丝。
Retinoic acid-inducible gene-I (RIG-I) is an intracellular RNA sensor that activates the innate immune machinery in response to infection by RNA viruses. Here, we report the crystal structure of distinct conformations of a RIG-I:dsRNA complex, which shows that HEL2i-mediated scanning allows RIG-I to sense the length of RNA targets. To understand the implications of HEL2i scanning for catalytic activity and signalling by RIG-I, we examined its ATPase activity when stimulated by duplex RNAs of varying lengths and 5′ composition. We identified a minimal RNA duplex that binds one RIG-I molecule, stimulates robust ATPase activity, and elicits a RIG-I-mediated interferon response in cells. Our results reveal that the minimal functional unit of the RIG-I:RNA complex is a monomer that binds at the terminus of a duplex RNA substrate. This behaviour is markedly different from the RIG-I paralog melanoma differentiation-associated gene 5 (MDA5), which forms cooperative filaments.
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