The transcription factor NFkappaB plays an important role in inflammatory and immunologic processes. The NFkappaB-system is mediated by the IkappaB-kinase-complex, which consists of the subunits IKKalpha, IKKbeta and IKKgamma in its classical configuration. The current study demonstrated the existence of endogenous IKK-subcomplexes in monocytic cells. Apart from the adapter protein IKKgamma these complexes only include IKKbeta, not IKKalpha, as a kinase-active subunit. These IKKbeta/IKKgamma-subcomplexes can be activated by TNF, but not by NIK, which suggests a selective activatability of the IKKbeta/IKKgamma-subcomplexes. In the absence of IKKalpha we found a retarded proteolysis of IkappaBalpha, but not of IkappaBepsilon. The results indicate, that the IKKbeta/IKKgamma-subcomplexes have a diverse dynamic of signaling, compared to the classical IKK-complexes.
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The transcription factor NFkappaB plays an important role in inflammatory and immunologic processes. The NFkappaB-system is mediated by the IkappaB-kinase-complex, which consists of the subunits IKKalpha, IKKbeta and IKKgamma in its classical configuration. The current study demonstrated the existence of endogenous IKK-subcomplexes in monocytic cells. Apart from the adapter protein IKKgamma these complexes only include IKKbeta, not IKKalpha, as a kinase-active subunit. These IKKbeta/IKKgamma-sub...
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