Nucleotide sequences and modifications that determine RIG-I/RNA binding and signaling activities
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Final Revised Submission PDF Uzri JV.pdf
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main article
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378.84 KB
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Author(s)
Urzi, Dina
Gehrke, Lee
Date Issued
February 2009
Journal
Journal of Virology
Publisher
American Society for Microbiology
Citation
Uzri, D., and L. Gehrke. “Nucleotide Sequences and Modifications That Determine RIG-I/RNA Binding and Signaling Activities.” Journal of Virology 83.9 (2009): 4174–4184.
Version
Author's final manuscript
Abstract
Cytoplasmic viral RNAs with 5′ triphosphates (5′ppp) are detected by the RNA helicase RIG-I, initiating downstream signaling and alpha/beta interferon (IFN-α/β) expression that establish an antiviral state. We demonstrate here that the hepatitis C virus (HCV) 3′ untranslated region (UTR) RNA has greater activity as an immune stimulator than several flavivirus UTR RNAs. We confirmed that the HCV 3′-UTR poly(U/UC) region is the determinant for robust activation of RIG-I-mediated innate immune signaling and that its antisense sequence, poly(AG/A), is an equivalent RIG-I activator. The poly(U/UC) region of the fulminant HCV JFH-1 strain was a relatively weak activator, while the antisense JFH-1 strain poly(AG/A) RNA was very potent. Poly(U/UC) activity does not require primary nucleotide sequence adjacency to the 5′ppp, suggesting that RIG-I recognizes two independent RNA domains. Whereas poly(U) 50-nt or poly(A) 50-nt sequences were minimally active, inserting a single C or G nucleotide, respectively, into these RNAs increased IFN-β expression. Poly(U/UC) RNAs transcribed in vitro using modified uridine 2′ fluoro or pseudouridine ribonucleotides lacked signaling activity while functioning as competitive inhibitors of RIG-I binding and IFN-β expression. Nucleotide base and ribose modifications that convert activator RNAs into competitive inhibitors of RIG-I signaling may be useful as modulators of RIG-I-mediated innate immune responses and as tools to dissect the RNA binding and conformational events associated with signaling.
MIT Department
Harvard University--MIT Division of Health Sciences and Technology
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DOI of Published Version
https://doi.org/10.1128/jvi.02449-08
