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FEBS Lett. 1999 Apr 1;448(1):81-5.

Effects of IL-1 receptor-associated kinase (IRAK) expression on IL-1 signaling are independent of its kinase activity.

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Institut für Molekularpharmakologie, Medizinische Hochschule Hannover, Germany.


Interleukin-1 (IL-1) stimulates the association of the IL-1 receptor-associated protein kinase (IRAK) with the heterodimer of IL-IRI and IL-IRAcP via the adapter protein MyD88. In the receptor complex IRAK becomes heavily phosphorylated and concomitantly activated. Here we show that overexpression of a kinase-inactive mutant of IRAK (K239S) inhibits neither IL-1-stimulated activation of the transcription factor NF-kappaB, nor that of the c-Jun N-terminal kinase nor IL-2 production in murine EL-4 cells, but enhances these effects in a manner comparable to wild type IRAK. This strongly suggests that the intrinsic kinase activity is not required for downstream signaling via IRAK.

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