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DDX58 an innate immune receptor which acts as a cytoplasmic sensor of viral nucleic acids and plays a major role in sensing viral infection and in the activation of a cascade of antiviral responses including the induction of type I interferons and proinflammatory cytokines. Its ligands include: 5'- triphosphorylated ssRNA and dsRNA and short dsRNA (<1 kb in length). In addition to the 5'-triphosphate moiety, blunt-end base pairing at the 5'-end of the RNA is very essential. Overhangs at the non-triphosphorylated end of the dsRNA RNA have no major impact on its activity. A 3'overhang at the 5'triphosphate end decreases and any 5'overhang at the 5' triphosphate end abolishes its activity. Upon ligand binding it associates with mitochondria antiviral signaling protein MAVS which activates the IKK- related kinases TBK1 and IKBKE which phosphorylate interferon regulatory factors IRF3 and IRF7, in turn activating transcription of antiviral immunological genes, including IFN-alpha and IFN-beta. Detects both positive and negative strand RNA viruses including members of the families Paramyxoviridae: Human respiratory synctial virus and measles virus (MeV), Rhabdoviridae: vesicular stomatitis virus (VSV), Orthomyxoviridae: influenza A and B virus, Flaviviridae: Japanese encephalitis virus (JEV), hepatitis C virus (HCV), dengue virus (DENV) and west Nile virus (WNV). It also detects rotavirus and reovirus. Also involved in antiviral signaling in response to viruses containing a dsDNA genome such as Epstein-Barr virus (EBV). Detects dsRNA produced from non-self dsDNA by RNA polymerase III, such as Epstein-Barr virus-encoded RNAs (EBERs). May play important roles in granulocyte production and differentiation, bacterial phagocytosis and in the regulation of cell migration. Maintained as a monomer in an autoinhibited state. Upon viral dsRNA binding and conformation shift, homomultimerizes and interacts with MAVS. Interacts with DHX58, IKBKE, TBK1 and STING. Interacts (via CARD domain) with TRIM25 (via SPRY domain). Interacts with RNF135. Interacts with CYLD. Interacts with NLRC5; blocks the interaction of MAVS to DDX58. Interacts with SRC. Interacts with protein Z of Guanarito virus, Machupo virus, Junin arenavirus and Sabia virus. This interaction disrupts its interaction with MAVS, impeding downstream IRF3 and NF-kappa-B activation and resulting in decreased IFN-beta induction. Interacts (via CARD domain) with Human respiratory syncytial virus A non-structural protein 2 (NS2) and this interaction disrupts its interaction with MAVS, impeding downstream IRF3 activation. Present in vascular smooth cells. Belongs to the helicase family. RLR subfamily. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: EC; Hydrolase
Chromosomal Location of Human Ortholog: 9p21.1
Cellular Component: actin cytoskeleton; bicellular tight junction; cytoplasm; cytosol
Molecular Function: ATP binding; double-stranded DNA binding; double-stranded RNA binding; helicase activity; identical protein binding; protein binding; single-stranded RNA binding; ubiquitin protein ligase binding; zinc ion binding
Biological Process: defense response to virus; detection of virus; innate immune response; negative regulation of type I interferon production; positive regulation of defense response to virus by host; positive regulation of granulocyte macrophage colony-stimulating factor production; positive regulation of interferon-alpha production; positive regulation of interferon-beta production; positive regulation of interleukin-6 production; positive regulation of interleukin-8 production; positive regulation of transcription factor activity; positive regulation of transcription factor import into nucleus; positive regulation of transcription from RNA polymerase II promoter; protein deubiquitination; regulation of cell migration; response to virus; viral process
Disease: Singleton-merten Syndrome 2
Reference #:  O95786 (UniProtKB)
Alt. Names/Synonyms: DDX58; DEAD (Asp-Glu-Ala-Asp) box polypeptide 58; DEAD box protein 58; DEAD/H (Asp-Glu-Ala-Asp/His) box polypeptide; DKFZp434J1111; DKFZp686N19181; FLJ13599; Probable ATP-dependent RNA helicase DDX58; retinoic acid inducible gene I; Retinoic acid-inducible gene 1 protein; Retinoic acid-inducible gene I protein; RIG-1; RIG-I; RNA helicase RIG-I
Gene Symbols: DDX58
Molecular weight: 106,600 Da
Basal Isoelectric point: 6.03  Predict pI for various phosphorylation states
CST Pathways:  Toll-Like Receptor Signaling
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