In mammals activated IRAK4 phosphorylates both IRAK1 and IRAK2. Activated IRAK1 and IRAK2 in turn induce NFkB and AP-1 intracellular signaling cascades mediated by TRAF6.
Bioinformatic analysis reveals no evidence of IRAK1 in the chicken genome. It is possible that the chicken TLR pathway utilizes only IRAK-2, which shares 47% amino acid sequence identity with human IRAK2.
Cormican, P, Lloyd, AT, Downing, T, Connell, SJ, Bradley, D, O'Farrelly, C
Kawagoe, T, Sato, S, Matsushita, K, Kato, H, Matsui, K, Kumagai, Y, Saitoh, T, Kawai, T, Takeuchi, O, Akira, S
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