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IFN regulatory factor-3 is a transcription factor that is required for the rapid induction of type I IFNs in the innate antiviral response. Two noncanonical IkappaB kinase (IKK) family members, IKKepsilon and TRAF family-associated NF-kappaB activator-binding kinase-1, have been shown to phosphorylate IFN regulatory factor-3 and are critically involved in virus-triggered and TLR3-mediated signaling leading to induction of type I IFNs. In yeast two-hybrid screens for potential IKKepsilon-interacting proteins, we identified Ret finger protein (RFP) as an IKKepsilon-interacting protein. Coimmunoprecipitation experiments indicated that RFP interacted with IKKepsilon and TRAF family-associated NF-kappaB activator-binding kinase-1 as well as the two canonical IKK family members, IKKbeta and IKKalpha. RFP inhibited activation of the IFN-stimulated response element and/or NF-kappaB mediated by the IKK family members and triggered by TNF, IL-1, polyinosinic-polycytidylic acid (ligand for TLR3), and viral infection. Moreover, knockdown of RFP expression by RNA interference-enhanced activation of IFN-stimulated response element and/or NF-kappaB triggered by polyinosinic-polycytidylic acid, TNF, and IL-1. Taken together, our findings suggest that RFP negatively regulates signaling involved in the antiviral response and inflammation by targeting the IKKs.

The Ret Finger Protein Inhibits Signaling Mediated by the Noncanonical and Canonical IκB Kinase Family Members