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PLoS One. 2008;3(12):e3965. doi: 10.1371/journal.pone.0003965. Epub 2008 Dec 30.

RIG-I and dsRNA-induced IFNbeta activation.

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  • 1Department of Microbiology and Molecular Medicine, University of Geneva Medical School, Geneva, Switzerland.

Abstract

Except for viruses that initiate RNA synthesis with a protein primer (e.g., picornaviruses), most RNA viruses initiate RNA synthesis with an NTP, and at least some of their viral (ppp)RNAs remain unblocked during the infection. Consistent with this, most viruses require RIG-I to mount an innate immune response, whereas picornaviruses require mda-5. We have examined a SeV infection whose ability to induce interferon depends on the generation of capped dsRNA (without free 5' tri-phosphate ends), and found that this infection as well requires RIG-I and not mda-5. We also provide evidence that RIG-I interacts with poly-I/C in vivo, and that heteropolymeric dsRNA and poly-I/C interact directly with RIG-I in vitro, but in different ways; i.e., poly-I/C has the unique ability to stimulate the helicase ATPase of RIG-I variants which lack the C-terminal regulatory domain.

PMID:
19115016
[PubMed - indexed for MEDLINE]
PMCID:
PMC2607022
Free PMC Article
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