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
Ghosh, Gourisankar
中科院分区:
生物学1区
文献类型:
--
作者:
Savinova, Olga V.;Hoffmann, Alexander;Ghosh, Gourisankar

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Nfkb 1和Nfkb 2蛋白p105和p100既作为NF-κB前体又作为NF-κB二聚体的抑制剂。在内源性细胞质和纯化的重组蛋白的生化表征中,我们发现p105和p100组装成高分子量复合物,有助于所有NF-κB亚型的调节。与经典抑制剂IκBα、-β和-ε不同,p105和p100蛋白质的高分子量复合物以两种模式结合NF-κB亚基:通过含Rel同源结构域的NF-κB多肽的直接二聚化,以及通过p105和p100锚蛋白重复序列与预先形成的NF-κB二聚体的相互作用,从而介导真正的IκB活性、IκBγ和IκBδ。我们的生物化学证据表明了一种组装途径,其中动力学机制通过加工和组装含有IκB活性的大复合物来控制NF-κB二聚体的形成。
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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