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
中科院分区:
文献类型:
--
作者:
Kohlway, Andrew;Luo, Dahai;Rawling, David C.;Ding, Steve C.;Pyle, Anna Marie
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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