Product Pathways - NF-kB Signaling
IRF-3 (D83B9) Rabbit mAb #4302
|W IP||H M R Mk||Endogenous||45-55||Rabbit IgG|
Reactivity Key: H=Human M=Mouse R=Rat Mk=Monkey
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.
Specificity / Sensitivity
IRF-3 (D83B9) Rabbit mAb detects endogenous levels of total IRF-3 protein.
Source / Purification
Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the carboxyl terminus of human IRF-3.
Western blot analysis of extracts from COS-7 cells, mock transfected or transfected with human, mouse or rat IRF-3 constructs, using IRF-3 (D83B9) Rabbit mAb. The human and mouse constructs contain epitope tags.
Western blot analysis of extracts from various cell lines using IRF-3 (D83B9) Rabbit mAb.
Western blot analysis of extracts from differentiated THP-1 cells, untreated or treated with LPS (1 µg/ml, 1 hour), using Phospho-IRF-3 (Ser396) (4D4G) Rabbit mAb #4947 (upper) or IRF-3 (D83B9) Rabbit mAb (lower).
Interferon regulatory factors (IRFs) comprise a family of transcription factors that function within the Jak/Stat pathway to regulate interferon (IFN) and IFN-inducible gene expression in response to viral infection (1). IRFs play an important role in pathogen defense, autoimmunity, lymphocyte development, cell growth, and susceptibility to transformation. The IRF family includes nine members: IRF-1, IRF-2, ISGF3γ/p48, IRF-3, IRF-4 (Pip/LSIRF/ICSAT), IRF-5, IRF-6, IRF-7, and IRF-8/ICSBP. All IRF proteins share homology in their amino-terminal DNA-binding domains. IRF family members regulate transcription through interactions with proteins that share similar DNA-binding motifs, such as IFN-stimulated response elements (ISRE), IFN consensus sequences (ICS), and IFN regulatory elements (IRF-E) (2).
IRF-3 can inhibit cell growth and plays a critical role in controlling the expression of genes in the innate immune response (1-4). In unstimulated cells, IRF-3 is present in the cytoplasm. Viral infection results in phosphorylation of IRF-3 and leads to its translocation to the nucleus where it activates promoters containing IRF-3-binding sites. Phosphorylation of IRF-3 occurs at a cluster of carboxyl-terminal serine and threonine residues (between 385 and 405) leading to its association with the p300/CBP coactivator protein that promotes DNA binding and transcriptional activity (5). During infection, IRF-3 is likely activated through a pathway that includes activation of Toll-like receptors and of a kinase complex that includes IKKε and TBK1 (6,7). IRF-3 is phosphorylated at Ser396 following viral infection, expression of viral nucleocapsid, and double stranded RNA treatment. These events likely play a role in activation of IRF-3 (8).
- Taniguchi, T. et al. (2001) Annu Rev Immunol 19, 623-55.
- Honda, K. and Taniguchi, T. (2006) Nat Rev Immunol 6, 644-58.
- Hiscott, J. et al. (1999) J Interferon Cytokine Res 19, 1-13.
- Kim, T.Y. et al. (2003) J Biol Chem 278, 15272-8.
- Yoneyama, M. et al. (2002) J Interferon Cytokine Res 22, 73-6.
- Fitzgerald, K.A. et al. (2003) Nat Immunol 4, 491-6.
- Kopp, E. and Medzhitov, R. (2003) Curr Opin Immunol 15, 396-401.
- Servant, M.J. et al. (2003) J Biol Chem 278, 9441-7.
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- 7003 20X LumiGLO® Reagent and 20X Peroxide
For Research Use Only. Not For Use In Diagnostic Procedures.