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Essential role for IkappaB kinase beta in remodeling Carma1-Bcl10-Malt1 complexes upon T cell activation

Item Type:Article
Title:Essential role for IkappaB kinase beta in remodeling Carma1-Bcl10-Malt1 complexes upon T cell activation
Creators Name:Wegener, E. and Oeckinghaus, A. and Papadopoulou, N. and Lavitas, L. and Schmidt-Supprian, M. and Ferch, U. and Mak, T.W. and Ruland, J. and Heissmeyer, V. and Krappmann, D.
Abstract:T cell receptor (TCR) signaling to IkappaB kinase (IKK)/NF-kappaB is controlled by PKCtheta-dependent activation of the Carma1, Bcl10, and Malt1 (CBM) complex. Antigen-induced phosphorylation of Bcl10 has been reported, but its physiological function is unknown. Here we show that the putative downstream kinase IKKbeta is required for initial CBM complex formation. Further, upon engagement of IKKbeta/Malt1/Bcl10 with Carma1, IKKbeta phosphorylates Bcl10 in the C terminus and thereby interferes with Bcl10/Malt1 association and Bcl10-mediated IKKgamma ubiquitination. Mutation of the IKKbeta phosphorylation sites on Bcl10 enhances expression of NF-kappaB target genes IL-2 and TNFalpha after activation of primary T cells. Thus, our data provide evidence that IKKbeta serves a dual role upstream of its classical substrates, the IkappaB proteins. While being essential for triggering initial CBM complex formation, IKKbeta-dependent phosphorylation of Bcl10 exhibits a negative regulatory role in T cell activation.
Keywords:Signaling, Molimmuno, Animals, Mice
Source:Molecular Cell
ISSN:1097-2765
Publisher:Cell Press (U.S.A.)
Volume:23
Number:1
Page Range:13-23
Date:7 July 2006
Official Publication:https://doi.org/10.1016/j.molcel.2006.05.027
PubMed:View item in PubMed

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