Journal
RNA BIOLOGY
Volume 5, Issue 3, Pages 140-144Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/rna.5.3.6839
Keywords
modified RNA; self and non-self RNA; PKR; RNA structure; translation inhibition
Categories
Funding
- NIGMS NIH HHS [R01 GM058709, R01 GM058709-10A1] Funding Source: Medline
- PHS HHS [R01-58709] Funding Source: Medline
Ask authors/readers for more resources
Interferon inducible protein kinase PKR is a component of innate immunity and mediates antiviral actions by recognizing pathogen associated molecular patterns (PAMPs). A well-known activator of PKR is long dsRNA, which can be produced during viral replication. Our recent results indicate that PKR can also be activated by short stem-loop RNA in a 5'-triphosphate-dependent fashion. A 5'-triphosphate is present primarily in foreign RNAs such as viral and bacterial transcripts, while a non-activating 5'-cap or 5'-monophosphate is present in most cellular RNAs. Additional studies indicate that internal RNA modifications and non-Watson-Crick motifs also repress PKR activation, and do so in an RNA structure-specific fashion. Interestingly, self-RNAs have more nucleoside modifications than non-self RNAs. Internal and 5'-end RNA modifications have repressive effects on other innate immune sensors as well, including TLR3, TLR7, TLR8, and RIG-L suggesting that nucleoside modifications suppress innate immunity on a wide scale.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available