The Nfkb1 and Nfkb2 proteins p105 and p100 function as the core of high-molecular-weight heterogeneous complexes.
The Nfkb1 and Nfkb2 proteins p105 and p100 function as the core of high-molecular-weight heterogeneous complexes.
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DOI:
10.1016/j.molcel.2009.04.033
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发表时间:
2009-06-12
期刊:
影响因子:
16
通讯作者:
Ghosh, Gourisankar
中科院分区:
文献类型:
--
作者:
Savinova, Olga V.;Hoffmann, Alexander;Ghosh, Gourisankar
Nfkb1 and Nfkb2 proteins p105 and p100 serve both as NF-κB precursors and inhibitors of NF-κB dimers. In a biochemical characterization of endogenous cytoplasmic and purified recombinant proteins, we found that p105 and p100 assemble into high-molecular-weight complexes that contribute to the regulation of all NF-κB isoforms. Unlike the classical inhibitors IκBα, -β, and -ε, high-molecular-weight complexes of p105 and p100 proteins bind NF-κB subunits in two modes: through direct dimerization of Rel homology domain-containing NF-κB polypeptides and through interactions of the p105 and p100 ankyrin repeats with preformed NF-κB dimers, thereby mediating the bona fide IκB activities, IκBγ and IκBδ. Our biochemical evidence suggests an assembly pathway in which kinetic mechanisms control NF-κB dimer formation via processing and assembly of large complexes that contain IκB activities.
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