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Journal Article
Research Support, N.I.H., Extramural
The TAR-RNA binding protein is required for immunoresponses triggered by Cardiovirus infection.
Biochemical and Biophysical Research Communications 2016 November 12
LGP2 and MDA5 cooperate to detect viral RNA in the cytoplasm of Picornavirus-infected cells and activate innate immune responses. To further define regulatory components of RNA recognition by LGP2/MDA5, a yeast two-hybrid screen was used to identify LGP2-interacting proteins. The screening has identified the TAR-RNA binding protein (TRBP), which is known to be an essential factor for RNA interference (RNAi). Immuno-precipitation experiments demonstrated that TRBP interacted specifically with LGP2 but not with related RIG-I-like receptors, RIG-I or MDA5. siRNA knockdown experiments indicate that TRBP is important for Cardiovirus-triggered interferon responses, but TRBP is not involved in Sendai virus-triggered interferon response that is mediated mainly by RIG-I. To support functional interaction with LGP2, overexpressed TRBP increased Cardiovirus-triggered interferon promoter activity only when LGP2 and MDA5 are co-expressed but not MDA5 alone. Together, our findings illustrate a possible connection between an RNAi-regulatory factor and antiviral RNA recognition that is specifically required for a branch of the virus induced innate immune response.
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