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    J Biol Chem. 2007 Oct 26;282(43):31131-46. Epub 2007 Sep 6.

    Lipopolysaccharide-mediated interferon regulatory factor activation involves TBK1-IKKepsilon-dependent Lys(63)-linked polyubiquitination and phosphorylation of TANK/I-TRAF.

    Gatot JS, Gioia R, Chau TL, Patrascu F, Warnier M, Close P, Chapelle JP, Muraille E, Brown K, Siebenlist U, Piette J, Dejardin E, Chariot A.

    Source

    Interdisciplinary Cluster for Applied Genoproteomics, Medical Chemistry, and Virology/Immunology units, University of Liege, Sart-Tilman, 4000 Liège, Belgium.

    Abstract

    Type I interferon gene induction relies on IKK-related kinase TBK1 and IKKepsilon-mediated phosphorylations of IRF3/7 through the Toll-like receptor-dependent signaling pathways. The scaffold proteins that assemble these kinase complexes are poorly characterized. We show here that TANK/ITRAF is required for the TBK1- and IKKepsilon-mediated IRF3/7 phosphorylations through some Toll-like receptor-dependent pathways and is part of a TRAF3-containing complex. Moreover, TANK is dispensable for the early phase of double-stranded RNA-mediated IRF3 phosphorylation. Interestingly, TANK is heavily phosphorylated by TBK1-IKKepsilon upon lipopolysaccharide stimulation and is also subject to lipopolysaccharide- and TBK1-IKKepsilon-mediated Lys(63)-linked polyubiquitination, a mechanism that does not require TBK1-IKKepsilon kinase activity. Thus, we have identified TANK as a scaffold protein that assembles some but not all IRF3/7-phosphorylating TBK1-IKKepsilon complexes and demonstrated that these kinases possess two functions, namely the phosphorylation of both IRF3/7 and TANK as well as the recruitment of an E3 ligase for Lys(63)-linked polyubiquitination of their scaffold protein, TANK.

    PMID:
    17823124
    [PubMed - indexed for MEDLINE]
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