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Mol. Cell. Biol. doi:10.1128/MCB.02380-06
Copyright (c) 2008, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

IL-1 induces the Lys63-linked polyubiquitination of IRAK1 to facilitate NEMO binding and the activation of IKK

MRC Protein Phosphorylation Unit, and Division of Signal Transduction Therapy, The Sir James Black Centre, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, Scotland, UK

^* To whom correspondence should be addressed. Email: p.cohen{at}dundee.ac.uk.

	Abstract

Interleukin 1 (IL-1) has been reported to stimulate the polyubiquitination and disappearance of IRAK1 within minutes. It has been thought that the polyubiquitin chains attached to IRAK1 are linked via Lys48 of ubiquitin leading to its destruction by the proteasome, and explaining the rapid IL-1-induced disappearance of IRAK1. In this paper we demonstrate, that IL-1-stimulates the formation of K63-pUb-IRAK1 and not K48-pUb-IRAK1 and that the IL-1-induced disappearance of IRAK1 is not blocked by inhibition of the proteasome. We also show that IL-1 triggers the interaction of K63-pUb-IRAK1 with NEMO, a regulatory subunit of the IKK complex, but not with the NEMO[lsqb]D311N[rsqb] mutant that cannot bind K63-pUb chains. Moreover, unlike wild-type NEMO, the NEMO[lsqb]D311N[rsqb] mutant was unable to restore IL-1-stimulated NFB-dependent gene transcription to NEMO-deficient cells. Our data suggest a model in which the recruitment of the NEMO-IKK complex to K63-pUb-IRAK1 and the recruitment of the TAK1 complex to TRAF6 facilitates the TAK1-catalysed activation of IKK by the TRAF6-IRAK1 complex.

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