IRF3

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

Function

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] The complex translocates into the nucleus for the transcriptional activation of interferons alpha and beta, and further 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 2015 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 activating the production of type-I interferons.[7] Another study has shown that IRF3-/- knockouts protect from myocardial infarction.[8] The same study identified IRF3 and the type I IFN response as a potential therapeutic target for post-myocardial infarction cardioprotection.[8]

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

Interactions

IRF3 has been shown to interact with IRF7.[9]

References

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  1. ^ a b Page Module:Citation/CS1/styles.css has no content.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. ^ Page Module:Citation/CS1/styles.css has no content.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. doi:10.1128/MCB.19.2.959. PMC 116027. PMID 9891032.
  3. ^ Page Module:Citation/CS1/styles.css has no content.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. ^ Page Module:Citation/CS1/styles.css has no content."Entrez Gene: IRF3 interferon regulatory factor 3".
  5. ^ Page Module:Citation/CS1/styles.css has no content.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. ^ Page Module:Citation/CS1/styles.css has no content.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. ^ Page Module:Citation/CS1/styles.css has no content.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. ^ a b Page Module:Citation/CS1/styles.css has no content.King KR, Aguirre AD, Ye YX, Sun Y, Roh JD, Ng Jr RP, Kohler RH, Arlauckas SP, Iwamoto Y, Savol A, Sadreyev RI, Kelly M, Fitzgibbons TP, Fitzgerald KA, Mitchison T, Libby P, Nahrendorf M, Weissleder R (Nov 6, 2017). "IRF3 and type I interferons fuel a fatal response to myocardial infarction". Nature Medicine. 23 (12): 1481–1487. doi:10.1038/nm.4428. PMC 6477926. PMID 29106401.
  9. ^ Page Module:Citation/CS1/styles.css has no content.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.

Further reading

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