FEATURES

FAMILY

DESCRIPTION

Also known as IRF3_MOUSE, Irf3. Key transcriptional regulator of type I interferon (IFN)-dependent immune responses which plays a critical role in the innate immune response against DNA and RNA viruses (PubMed:15800576). Regulates the transcription of type I IFN genes (IFN-alpha and IFN-beta) and IFN-stimulated genes (ISG) by binding to an interferon-stimulated response element (ISRE) in their promoters (PubMed:15800576). Acts as a more potent activator of the IFN-beta (IFNB) gene than the IFN-alpha (IFNA) gene and plays a critical role in both the early and late phases of the IFNA/B gene induction (PubMed:16846591, PubMed:16979567, PubMed:20049431). Found in an inactive form in the cytoplasm of uninfected cells and following viral infection, double-stranded RNA (dsRNA), or toll-like receptor (TLR) signaling, is phosphorylated by IKBKE and TBK1 kinases (PubMed:16846591, PubMed:16979567, PubMed:20049431). This induces a conformational change, leading to its dimerization and nuclear localization and association with CREB binding protein (CREBBP) to form dsRNA-activated factor 1 (DRAF1), a complex which activates the transcription of the type I IFN and ISG genes (PubMed:16846591, PubMed:16979567, PubMed:20049431). Can activate distinct gene expression programs in macrophages and can induce significant apoptosis in primary macrophages (PubMed:16846591, PubMed:16979567, PubMed:20049431). Monomer. Homodimer; phosphorylation-induced. Interacts (when phosphorylated) with CREBBP. Interacts with MAVS (via phosphorylated pLxIS motif). Interacts with TICAM1 (via phosphorylated pLxIS motif). Interacts with STING1 (via phosphorylated pLxIS motif). Interacts with IKBKE and TBK1. Interacts with TICAM2. Interacts with RBCK1. Interacts with HERC5. Interacts with DDX3X; the interaction allows the phosphorylation and activation of IRF3 by IKBKE. Interacts with TRIM21 and ULK1, in the presence of TRIM21; this interaction leads to IRF3 degradation by autophagy. Interacts with RIOK3; RIOK3 probably mediates the interaction of TBK1 with IRF3. Interacts with ILRUN; the interaction inhibits IRF3 binding to its DNA consensus sequence. Interacts with LYAR; this interaction impairs IRF3 DNA-binding activity. Interacts with TRAF3. Interacts with ZDHHC11; ZDHHC11 recruits IRF3 to STING1 upon DNA virus infection and thereby promotes IRF3 activation (By similarity). Interacts with HSP90AA1; the interaction mediates IRF3 association with TOMM70. Interacts with BCL2; the interaction decreases upon Sendai virus infection. Interacts with BAX; the interaction is direct, increases upon virus infection and mediates the formation of the apoptosis complex TOMM70:HSP90AA1:IRF3:BAX (By similarity).

EXTERNAL LINKS

Irf3

Interferon regulatory factor 3

Irf3

Molecular Synopsis