title: IPS-1, an adaptor triggering RIG-I- and Mda5-mediated type I interferon induction.
abstract: Type I interferons are central mediators for antiviral responses. Using high-throughput functional screening of interferon inducers, we have identified here a molecule we call interferon-beta promoter stimulator 1 (IPS-1). Overexpression of IPS-1 induced type I interferon and interferon-inducible genes through activation of IRF3, IRF7 and NF-kappaB transcription factors. TBK1 and IKKi protein kinases were required for the IPS-1-mediated interferon induction. IPS-1 contained an N-terminal CARD-like structure that mediated interaction with the CARD of RIG-I and Mda5, which are cytoplasmic RNA helicases that sense viral infection. 'Knockdown' of IPS-1 by small interfering RNA blocked interferon induction by virus infection. Thus, IPS-1 is an adaptor involved in RIG-I- and Mda5-mediated antiviral immune responses.
authors.affiliation: Exploratory Research for Advanced Technology, Japan Science and Technology Agency.
authors.forename: Taro
authors.initials: T
authors.lastname: Kawai
authors.forename: Ken
authors.initials: K
authors.lastname: Takahashi
authors.forename: Shintaro
authors.initials: S
authors.lastname: Sato
authors.forename: Cevayir
authors.initials: C
authors.lastname: Coban
authors.forename: Himanshu
authors.initials: H
authors.lastname: Kumar
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kato
authors.forename: Ken J
authors.initials: KJ
authors.lastname: Ishii
authors.forename: Osamu
authors.initials: O
authors.lastname: Takeuchi
authors.forename: Shizuo
authors.initials: S
authors.lastname: Akira
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D002478:Cells, Cultured; D000071457:DEAD Box Protein 58; D053487:DEAD-box RNA Helicases; D004268:DNA-Binding Proteins / Q000378:metabolism; D006801:Humans; D051550:I-kappa B Kinase; D007369:Interferon Inducers / Q000378:metabolism*; D050838:Interferon Regulatory Factor-3; D050839:Interferon Regulatory Factor-7; D007370:Interferon Type I / Q000096:biosynthesis*; D000072640:Interferon-Induced Helicase, IFIH1; D016899:Interferon-beta / Q000235:genetics; D051379:Mice; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000502:physiology; D017434:Protein Structure, Tertiary; D020365:RNA Helicases / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D011971:Receptors, Immunologic; D016415:Sequence Alignment; D014157:Transcription Factors / Q000378:metabolism; D014721:Vesicular stomatitis Indiana virus / Q000276:immunology / Q000502:physiology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D004268:DNA-Binding Proteins; C494232:IRF3 protein, human; C494234:IRF7 protein, human; D007369:Interferon Inducers; D050838:Interferon Regulatory Factor-3; D050839:Interferon Regulatory Factor-7; D007370:Interferon Type I; C494233:Irf3 protein, mouse; C494235:Irf7 protein, mouse; C505371:MAVS protein, human; D016328:NF-kappa B; D012333:RNA, Messenger; D011971:Receptors, Immunologic; D014157:Transcription Factors; D016899:Interferon-beta; C498588:Tbk1 protein, mouse; D017346:Protein Serine-Threonine Kinases; C403191:TBK1 protein, human; D051550:I-kappa B Kinase; C452820:RIGI protein, human; C452815:IFIH1 protein, human; D000071457:DEAD Box Protein 58; D053487:DEAD-box RNA Helicases; D000072640:Interferon-Induced Helicase, IFIH1; D020365:RNA Helicases