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Cellular RNA interacts with MAVS to promote antiviral signaling

ABSTRACT: Immune signaling needs to be well-regulated to promote clearance of pathogens, while preventing aberrant inflammation. Interferons (IFNs) and antiviral genes are activated by the detection of viral RNA by RIG-I-like receptors (RLRs). Signal transduction downstream of RLRs proceeds through a multiprotein complex organized around the central adaptor protein MAVS. While protein-protein interactions and post-translational modifications are critical for the formation of the MAVS signalosome, whether RNA play a role in organizing these platforms is largely unknown. RNA can modulate protein complex function by allosteric regulation or by serving as a molecular guide or scaffold. We have found that MAVS directly interacts with the 3’ untranslated regions of cellular mRNAs through its central intrinsically disordered domain. Eliminating RNA by RNase treatment disrupts the MAVS signalosome and inhibits phosphorylation of the transcription factor IRF3. These findings support the hypothesis that RNA molecules scaffold the MAVS signaling platform to induce IFNs. Indeed, RNase treatment alters interactions between MAVS and newly identified regulators of RLR signaling. Together, this work uncovers a function for cellular RNA in promoting signaling through MAVS and highlights a generalizable principle of RNA regulatory control of cytoplasmic immune signaling complexes.

ORGANISM(S): Homo sapiens

PROVIDER: GSE244000 | GEO | 2025/03/19

REPOSITORIES: GEO

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