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Interferon regulatory factor 3
Protein IRF3 PDB 1j2f.png
PDB rendering based on 1j2f.
Available structures
PDB Ortholog search: PDBe, RCSB
Symbol IRF3
External IDs OMIM603734 MGI1859179 HomoloGene1208 GeneCards: IRF3 Gene
RNA expression pattern
PBB GE IRF3 202621 at tn.png
More reference expression data
Species Human Mouse
Entrez 3661 54131
Ensembl ENSG00000126456 ENSMUSG00000003184
UniProt Q14653 P70671
RefSeq (mRNA) NM_001197122 NM_016849
RefSeq (protein) NP_001184051 NP_058545
Location (UCSC) Chr 19:
49.66 – 49.67 Mb
Chr 7:
45 – 45 Mb
PubMed search [1] [2]

Interferon regulatory factor 3, also known as IRF3, is an interferon regulatory factor.[1]


IRF3 is a member of the interferon regulatory transcription factor (IRF) family.[1] IRF3 was originally discovered as a homolog of IRF1 and IRF2. IRF3 has been further characterized and shown to contain several functional domains including a nuclear export signal, a DNA-binding domain, a C-terminal IRF association domain and several regulatory phosphorylation sites.[2] IRF3 is found in an inactive cytoplasmic form that upon serine/threonine phosphorylation forms a complex with CREBBP.[3] This complex translocates to the nucleus and activates the transcription of interferons alpha and beta, as well as other interferon-induced genes.[4]

IRF3 plays an important role in the innate immune system's response to viral infection.[5] Aggregated MAVS have been found to activate IRF3 dimerization.[6] A recent study shows phosphorylation of innate immune adaptor proteins MAVS, STING and TRIF at a conserved pLxIS motif recruits and specifies IRF3 phosphorylation and activation by the Serine/threonine-protein kinase TBK1, thereby restricts the production of type-I interferons.[7]

Signaling pathway of toll-like receptors. Dashed grey lines represent unknown associations


IRF3 has been shown to interact with IRF7.[8]


  1. ^ a b Hiscott J, Pitha P, Genin P, Nguyen H, Heylbroeck C, Mamane Y, Algarte M, Lin R (1999). "Triggering the interferon response: the role of IRF-3 transcription factor". J. Interferon Cytokine Res. 19 (1): 1–13. doi:10.1089/107999099314360. PMID 10048763. 
  2. ^ Lin R, Heylbroeck C, Genin P, Pitha PM, Hiscott J (Feb 1999). "Essential Role of Interferon Regulatory Factor 3 in Direct Activation of RANTES Chemokine Transcription". Mol Cell Biol 19 (2): 959–66. PMC 116027. PMID 9891032. 
  3. ^ Yoneyama M, Suhara W, Fujita T (2002). "Control of IRF-3 activation by phosphorylation". J. Interferon Cytokine Res. 22 (1): 73–6. doi:10.1089/107999002753452674. PMID 11846977. 
  4. ^ "Entrez Gene: IRF3 interferon regulatory factor 3". 
  5. ^ Collins SE, Noyce RS, Mossman KL (Feb 2004). "Innate Cellular Response to Virus Particle Entry Requires IRF3 but Not Virus Replication". J Virol 78 (4): 1706–17. doi:10.1128/JVI.78.4.1706-1717.2004. PMC 369475. PMID 14747536. 
  6. ^ Hou F, Sun L, Zheng H, Skaug B, Jiang QX, Chen ZJ (Aug 5, 2011). "MAVS Forms Functional Prion-Like Aggregates To Activate and Propagate Antiviral Innate Immune Response". Cell 146 (3): 448–61. doi:10.1016/j.cell.2011.06.041. PMC 3179916. PMID 21782231. 
  7. ^ Liu S, Cai X, Wu J, Cong Q, Chen X, Li T, Du F, Ren J, Wu Y, Grishin N, and Chen ZJ (Mar 13, 2015). "Phosphorylation of innate immune adaptor proteins MAVS, STING, and TRIF induces IRF3 activation.". Science 347 (6227): aaa2630. doi:10.1126/science.aaa2630. PMID 25636800. 
  8. ^ Au WC, Yeow WS, Pitha PM (Feb 2001). "Analysis of functional domains of interferon regulatory factor 7 and its association with IRF-3". Virology 280 (2): 273–82. doi:10.1006/viro.2000.0782. PMID 11162841. 

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