Journal
PLOS PATHOGENS
Volume 9, Issue 9, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.ppat.1003610
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Funding
- Estonian Ministry of Education and Research [SF0180175As08]
- European Regional Development Fund through the Center of Excellence in Chemical Biology
- European Social Grant [1.2.0401.09-0073]
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Type I interferons (IFN) are important for antiviral responses. Melanoma differentiation-associated gene 5 (MDA-5) and retinoic acid-induced gene I (RIG-I) proteins detect cytosolic double-stranded RNA (dsRNA) or 5'-triphosphate (5'-ppp) RNA and mediate IFN production. Cytosolic 5'-ppp RNA and dsRNA are generated during viral RNA replication and transcription by viral RNA replicases [RNA-dependent RNA polymerases (RdRp)]. Here, we show that the Semliki Forest virus (SFV) RNA replicase can induce IFN-beta independently of viral RNA replication and transcription. The SFV replicase converts host cell RNA into 5'-ppp dsRNA and induces IFN-beta through the RIG-I and MDA-5 pathways. Inactivation of the SFV replicase RdRp activity prevents IFN-beta induction. These IFN-inducing modified host cell RNAs are abundantly produced during both wild-type SFV and its non-pathogenic mutant infection. Furthermore, in contrast to the wild-type SFV replicase a non-pathogenic mutant replicase triggers increased IFN-beta production, which leads to a shutdown of virus replication. These results suggest that host cells can restrict RNA virus replication by detecting the products of unspecific viral replicase RdRp activity.
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