Cell Signaling Technology

Product Pathways - NF-kappaB Signaling

IRAK4 Antibody #4363

Applications Reactivity Sensitivity MW (kDa) Source
W IP H M R Mk Endogenous 55 Rabbit

Applications Key:  W=Western Blotting  IP=Immunoprecipitation
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey
Species cross-reactivity is determined by Western blot.

Specificity / Sensitivity

IRAK4 Antibody detects endogenous levels of total IRAK4. Cross-reactivity was not detected with other family members.

Source / Purification

Polyclonal antibodies are produced by immunizing rabbits with a synthetic peptide (KLH-coupled) corresponding to residues surrounding lysine 41 of human IRAK4. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western Blotting

Western blot analysis of extracts from THP-1 (human), RAW 264.7 (mouse), and H-4-II-E (rat) cell lines, using IRAK4 Antibody.

Background

Interleukin-1 (IL-1) receptor-associated kinase (IRAK) is a serine/threonine-specific kinase that can be coprecipitated in an IL-1-inducible manner with the IL-1 receptor (1). The mammalian family of IRAK molecules contains four members (IRAK1, IRAK2, IRAK3/IRAK-M and IRAK4). The binding of IL-1 to IL-1 receptor type I (IL-1RI) initiates the formation of a complex that includes IL-1RI, AcP, MyD88 and IRAKs (2). IRAK undergoes autophosphorylation shortly after IL-1 stimulation. The subsequent events involve IRAK dissociation from the IL-1RI complex, its ubiquitination and its association with two membrane-bound proteins: TAB2 and TRAF6. The resulting IRAK-TRAF6-TAB2 complex is then released into the cytoplasm and activates protein kinase cascades, which include TAK1, IKKs and the stress-activated kinases (3).

Upon IL-1R/TLR (Toll-Like Receptor) ligation, IRAK1 and IRAK4 are rapidly recruited to the receptor by the adaptor MyD88 (4). IRAK1 is phosphorylated by IRAK4 at Thr209 and Thr387 (5), followed by sequential autohyperphosphorylation in various domains.

  1. Dinarello, C.A. (1996) Blood 87, 2095-2147.
  2. Takaesu, G. et al. (2001) Mol. Cell. Biol. 21, 2475-2484.
  3. Janssens, S. and Beyaert, R. (2003) Mol. Cell 11, 293-302.
  4. Gottipati, S. et al. (2008) Cell Signal 20, 269-76.
  5. Kollewe, C. et al. (2004) J Biol Chem 279, 5227-36.

Application References

Have you published research involving the use of our products? If so we'd love to hear about it. Please let us know!

Companion Products

This product is for in vitro research use only and is not intended for use in humans or animals. This product is not intended for use as therapeutic or in diagnostic procedures.

Products