Cytoplasm . Nucleus . Translocated into the nucleus upon activation by IFN-alpha/beta.
Tissue Expression
Signaling_pathway
Cellular Processes >> Cell growth and death >> Necroptosis;Organismal Systems >> Immune system >> Toll-like receptor signaling pathway;Organismal Systems >> Immune system >> NOD-like receptor signaling pathway;Organismal Systems >> Development and regeneration >> Osteoclast differentiation;Environmental Information Processing >> Signal transduction >> JAK-STAT signaling pathway
Research Areas
Function
Transcription factor that plays an essential role in anti-viral immunity. It mediates signaling by type I IFNs (IFN-alpha and IFN-beta). Following type I IFN binding to cell surface receptors, Jak kinases (TYK2 and JAK1) are activated, leading to tyrosine phosphorylation of STAT1 and STAT2. IRF9/ISGF3G associates with the phosphorylated STAT1:STAT2 dimer to form a complex termed ISGF3 transcription factor, that enters the nucleus. ISGF3 binds to the IFN stimulated response element (ISRE) to activate the transcription of interferon stimulated genes, which drive the cell in an antiviral state.