IRAK4 binds to the activated TLR7 or 21

Stable Identifier
Reaction [binding]
Gallus gallus
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Mammalian IL-1 receptor-associated kinases IRAK-1, IRAK-2 and IRAK-4 form a multigene family. Those proteins are Ser/Thr protein kinases that are required for TLR mediated pathways leading to NFkB activation. Another IRAK family member IRAK-M has been identified as an inhibitor of TLR signaling.

Mammalian IRAK-4 is the homolog of Drosophila melanogaster Pelle. Like Pelle and unlike the other mammalian IRAKs, IRAK-4 is considered to be a central TIR signalling mediator in innate immunity. Mutagenesis analysis showed that any interference with IRAK-4's kinase activity virtually abolished downstream events. This is not the case with other members of the IRAK family.

Formation of MyD88:IRAKs multimer relies on homotypic interactions of death domains (DD). It triggers a cascade of phosphorylation reactions that leads to activation of NF-kB/AP-1 and transcription of multiple genes involved in the immune response.

The predicted chicken full-length IRAK-4 protein contains 414aa and is 58% identical to human IRAK-4. Chicken IRAK-4 contains a conserved N-terminal death domain and C-terminal protein kinase domain.

Literature References
PubMed ID Title Journal Year
19539094 The avian Toll-Like receptor pathway--subtle differences amidst general conformity

Lloyd, AT, Downing, T, Cormican, P, Bradley, D, O'Farrelly, C, Connell, SJ

Dev Comp Immunol 2009
11960013 IRAK-4: a novel member of the IRAK family with the properties of an

Wesche, H, Li, S, Fontana, EJ, Strelow, A

Proc Natl Acad Sci U S A 2002
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