title: Inhibition of RIG-I and MDA5-dependent antiviral response by gC1qR at mitochondria.
abstract: gC1qR is one of the C1q receptors implicated in the regulation of innate and adaptive immunity. We found that gC1qR inhibits RIG-I and MDA5-dependent antiviral signaling. Double stranded RNA and virus trigger the translocation of gC1qR to the mitochondrial outer membrane leading to the interaction of gC1qR with the RIG-I and MDA5 adaptor, VISA/MAVS/IPS-1/Cardif. The interaction of gC1qR with VISA/MAVS/IPS-1/Cardif at mitochondria results in the disruption of RIG-I and MDA5 signaling and the promotion of virus replication. Knockdown of endogenous gC1qR enhances RIG-I-dependent antiviral signaling, and augments the inhibition of virus proliferation. Therefore, gC1qR is a physiological inhibitor of the RIG-I and MDA5-mediated antiviral signaling pathway. These data uncover a new viral mechanism used to negatively control antiviral signaling in host cells.
authors.affiliation: National Key Laboratory of Protein Engineering and Plant Gene Engineering, College of Life Sciences, Peking University, Beijing, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Xu
authors.forename: Nengming
authors.initials: N
authors.lastname: Xiao
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Hongwei
authors.initials: H
authors.lastname: Ren
authors.forename: Jun
authors.initials: J
authors.lastname: Gu
mesh_terms: D002352:Carrier Proteins / Q000378:metabolism / Q000502:physiology*; D002460:Cell Line; D000071457:DEAD Box Protein 58; D053487:DEAD-box RNA Helicases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D055785:Gene Knockdown Techniques; D006801:Humans; D007113:Immunity, Innate; D000072640:Interferon-Induced Helicase, IFIH1; D008928:Mitochondria / Q000378:metabolism*; D024101:Mitochondrial Proteins / Q000378:metabolism / Q000502:physiology*; D021381:Protein Transport; D011971:Receptors, Immunologic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D014777:Virus Diseases / Q000276:immunology* / Q000378:metabolism
chemical_list: C087299:C1QBP protein, human; D002352:Carrier Proteins; D024101:Mitochondrial Proteins; D011971:Receptors, Immunologic; C452820:RIGI protein, human; C452815:IFIH1 protein, human; D000071457:DEAD Box Protein 58; D053487:DEAD-box RNA Helicases; D000072640:Interferon-Induced Helicase, IFIH1