Interferon regulatory factor 5 is a protein that in humans is encoded by the IRF5 gene.[5] The IRF family is a group of transcription factors that are involved in signaling for virus responses in mammals along with regulation of certain cellular functions.[6]
Quick Facts Available structures, PDB ...
Close
IRF5 is a member of the interferon regulatory factor (IRF) family, a group of transcription factors with diverse roles, including virus-mediated activation of interferon, and modulation of cell growth, differentiation, apoptosis, and immune system activity. Members of the IRF family are characterized by a conserved N-terminal DNA-binding domain containing tryptophan (W) repeats. Alternative splice variants encoding different isoforms exist.[5] The regulatory and repression regions of the IRF family are mainly located in the C-terminal of the IRF.[7]
A 2020 study showed that an adaptor protein named TASL play an important regulatory role in IRF5 activation by being phosphorylated at the pLxIS motif,[8] drawing a similar analogy to the IRF3 activation pathway through the adaptor proteins MAVS, STING and TRIF.[9]
IRF5 acts as a molecular switch that controls whether macrophages will promote or inhibit inflammation. Blocking the production of IRF5 in macrophages may help treat a wide range of autoimmune diseases, and that boosting IRF5 levels might help treat people whose immune systems are weak, compromised, or damaged. IRF5 seems to work "either by interacting with DNA directly, or by interacting with other proteins that themselves control which genes are switched on."[10]
The IRF family regulates the gene expression for the interferon (IFN) response to viral infections.[6] IRF5 is a direct transducer to interferon signaling and is activated via phosphorylation.[11] The IRF family can also initiate the JAK/STAT signaling pathway by binding to transmembrane receptors that activate JAK.[12] IRFs, IFNs, and the JAK/STAT signaling pathway work together to fight viral infections in mammals through specific signals.[13]
Chistiakov DA, Myasoedova VA, Revin VV, Orekhov AN, Bobryshev YV (January 2018). "The impact of interferon-regulatory factors to macrophage differentiation and polarization into M1 and M2". Immunobiology. 223 (1): 101–111. doi:10.1016/j.imbio.2017.10.005. PMID 29032836. Krausgruber T, Blazek K, Smallie T, Alzabin S, Lockstone H, Sahgal N, et al. (March 2011). "IRF5 promotes inflammatory macrophage polarization and TH1-TH17 responses". Nature Immunology. 12 (3): 231–238. doi:10.1038/ni.1990. PMID 21240265. S2CID 13730047.
- Pitha PM, Au WC, Lowther W, Juang YT, Schafer SL, Burysek L, et al. (1999). "Role of the interferon regulatory factors (IRFs) in virus-mediated signaling and regulation of cell growth". Biochimie. 80 (8–9): 651–658. doi:10.1016/S0300-9084(99)80018-2. PMID 9865487.
- Barnes B, Lubyova B, Pitha PM (January 2002). "On the role of IRF in host defense". Journal of Interferon & Cytokine Research. 22 (1): 59–71. doi:10.1089/107999002753452665. PMID 11846976.
- Barnes BJ, Moore PA, Pitha PM (June 2001). "Virus-specific activation of a novel interferon regulatory factor, IRF-5, results in the induction of distinct interferon alpha genes". The Journal of Biological Chemistry. 276 (26): 23382–23390. doi:10.1074/jbc.M101216200. PMID 11303025.
- Nehyba J, Hrdlicková R, Burnside J, Bose HR (June 2002). "A novel interferon regulatory factor (IRF), IRF-10, has a unique role in immune defense and is induced by the v-Rel oncoprotein". Molecular and Cellular Biology. 22 (11): 3942–3957. doi:10.1128/MCB.22.11.3942-3957.2002. PMC 133824. PMID 11997525.
- Barnes BJ, Kellum MJ, Field AE, Pitha PM (August 2002). "Multiple regulatory domains of IRF-5 control activation, cellular localization, and induction of chemokines that mediate recruitment of T lymphocytes". Molecular and Cellular Biology. 22 (16): 5721–5740. doi:10.1128/MCB.22.16.5721-5740.2002. PMC 133975. PMID 12138184.
- Barnes BJ, Field AE, Pitha-Rowe PM (May 2003). "Virus-induced heterodimer formation between IRF-5 and IRF-7 modulates assembly of the IFNA enhanceosome in vivo and transcriptional activity of IFNA genes". The Journal of Biological Chemistry. 278 (19): 16630–16641. doi:10.1074/jbc.M212609200. PMID 12600985.
- Barnes BJ, Kellum MJ, Pinder KE, Frisancho JA, Pitha PM (October 2003). "Interferon regulatory factor 5, a novel mediator of cell cycle arrest and cell death". Cancer Research. 63 (19): 6424–6431. PMID 14559832.
- Barnes BJ, Richards J, Mancl M, Hanash S, Beretta L, Pitha PM (October 2004). "Global and distinct targets of IRF-5 and IRF-7 during innate response to viral infection". The Journal of Biological Chemistry. 279 (43): 45194–45207. doi:10.1074/jbc.M400726200. PMID 15308637.
- Lin R, Yang L, Arguello M, Penafuerte C, Hiscott J (January 2005). "A CRM1-dependent nuclear export pathway is involved in the regulation of IRF-5 subcellular localization". The Journal of Biological Chemistry. 280 (4): 3088–3095. doi:10.1074/jbc.M408452200. PMID 15556946.
- Sigurdsson S, Nordmark G, Göring HH, Lindroos K, Wiman AC, Sturfelt G, et al. (March 2005). "Polymorphisms in the tyrosine kinase 2 and interferon regulatory factor 5 genes are associated with systemic lupus erythematosus". American Journal of Human Genetics. 76 (3): 528–537. doi:10.1086/428480. PMC 1196404. PMID 15657875.
- Takaoka A, Yanai H, Kondo S, Duncan G, Negishi H, Mizutani T, et al. (March 2005). "Integral role of IRF-5 in the gene induction programme activated by Toll-like receptors". Nature. 434 (7030): 243–249. Bibcode:2005Natur.434..243T. doi:10.1038/nature03308. PMID 15665823. S2CID 667829.
- Schoenemeyer A, Barnes BJ, Mancl ME, Latz E, Goutagny N, Pitha PM, et al. (April 2005). "The interferon regulatory factor, IRF5, is a central mediator of toll-like receptor 7 signaling". The Journal of Biological Chemistry. 280 (17): 17005–17012. doi:10.1074/jbc.M412584200. PMID 15695821.
- Mancl ME, Hu G, Sangster-Guity N, Olshalsky SL, Hoops K, Fitzgerald-Bocarsly P, et al. (June 2005). "Two discrete promoters regulate the alternatively spliced human interferon regulatory factor-5 isoforms. Multiple isoforms with distinct cell type-specific expression, localization, regulation, and function". The Journal of Biological Chemistry. 280 (22): 21078–21090. doi:10.1074/jbc.M500543200. PMID 15805103.
- Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, et al. (October 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–1178. Bibcode:2005Natur.437.1173R. doi:10.1038/nature04209. PMID 16189514. S2CID 4427026.
- Graham RR, Kozyrev SV, Baechler EC, Reddy MV, Plenge RM, Bauer JW, et al. (May 2006). "A common haplotype of interferon regulatory factor 5 (IRF5) regulates splicing and expression and is associated with increased risk of systemic lupus erythematosus". Nature Genetics. 38 (5): 550–555. doi:10.1038/ng1782. PMID 16642019. S2CID 21426281.
This article incorporates text from the United States National Library of Medicine, which is in the public domain.
