FEATURES

FAMILY

DESCRIPTION

Also known as DDX58_MOUSE, Ddx58. Innate immune receptor that senses cytoplasmic viral nucleic acids and activates a downstream signaling cascade leading to the production of type I interferons and proinflammatory cytokines. Forms a ribonucleoprotein complex with viral RNAs on which it homooligomerizes to form filaments. The homooligomerization allows the recruitment of RNF135 an E3 ubiquitin-protein ligase that activates and amplifies the RIG-I-mediated antiviral signaling in an RNA length-dependent manner through ubiquitination-dependent and -independent mechanisms. Upon activation, associates with mitochondria antiviral signaling protein (MAVS/IPS1) that activates the IKK-related kinases TBK1 and IKBKE which in turn phosphorylate the interferon regulatory factors IRF3 and IRF7, activating transcription of antiviral immunological genes including the IFN-alpha and IFN-beta interferons. 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. Detects both positive and negative strand RNA viruses including members of the families Paramyxoviridae: Sendai virus (SeV), Rhabdoviridae and Flaviviridae. It also detects rotavirus and orthoreovirus. Also involved in antiviral signaling in response to viruses containing a dsDNA genome. Detects dsRNA produced from non-self dsDNA by RNA polymerase III. May play important roles in granulocyte production and differentiation, bacterial phagocytosis and in the regulation of cell migration. Monomer; maintained as a monomer in an autoinhibited state. Upon binding of viral RNAs and conformational shift, homooligomerizes and forms filaments on these molecules. Interacts (via tandem CARD domain) with MAVS/IPS1 promoting its filamentation. Interacts with DHX58/LGP2, IKBKE, TBK1 and STING1. Interacts (via CARD domain) with TRIM25 (via SPRY domain). Interacts (double-stranded RNA-bound oligomeric form) with RNF135 (homodimer); involved in RNA length-dependent activation of the RIG-I signaling pathway. Interacts with CYLD. Interacts with NLRC5; blocks the interaction of MAVS/IPS1 to DDX58. Interacts with SRC. Interacts with DDX60. Interacts with ZC3HAV1 (via zinc-fingers) in an RNA-dependent manner. Interacts (via tandem CARD domain) with SEC14L1; the interaction is direct and impairs the interaction of DDX58 with MAVS/IPS1. Interacts with VCP/p97; interaction is direct and allows the recruitment of RNF125 and subsequent ubiquitination and degradation. Interacts with NOP53; may regulate DDX58 through USP15-mediated 'Lys-63'-linked deubiquitination (By similarity). Interacts with SIGLEC10, CBL and PTPN11; within a negative feedback loop leading to DDX58 degradation (PubMed:23374343). Interacts with LRRC25. Interacts with ZCCHC3; leading to activation of DDX58/RIG-I. Interacts with RNF123 (By similarity). Interacts with UBE2D3 and UBE2N; E2 ubiquitin ligases involved in RNF135-mediated ubiquitination of DDX58 and activation of the RIG-I signaling pathway (By similarity). Interacts with IFIT3 (By similarity). Interacts with DDX3X (By similarity).

EXTERNAL LINKS

Ddx58

Antiviral innate immune response receptor RIG-I

Ddx58

Molecular Synopsis