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TPL-2 kinase regulates the proteolysis of the NF-kappaB-inhibitory protein NF-kappaB1 p105.

Nature. 1999 Jan 28;397(6717):363-8. doi:10.1038/16946
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摘要


The transcription factor NF-kappaB is composed of homodimeric and heterodimeric complexes of Rel/NF-kappaB-family polypeptides, which include Rel-A, c-Rel, Rel-B, NF-kappaB/p50 and NF-kappaB2/p52 . The NF-kappaB1 gene encodes a larger precursor protein, p105, from which p50 is produced constitutively by proteasome-mediated removal of the p105 carboxy terminus. The p105 precursor also acts as an NFkappaB-inhibitory protein, retaining associated p50, c-Rel and Rel-A proteins in the cytoplasm through its carboxy terminus. Following cell stimulation by agonists, p105 is proteolysed more rapidly and released Rel subunits translocate into the nucleus. Here we show that TPL-2 , which is homologous to MAP-kinase-kinase kinases in its catalytic domain, forms a complex with the carboxy terminus of p105. TPL-2 was originally identified, in a carboxy-terminal-deleted form, as an oncoprotein in rats and is more than 90% identical to the human oncoprotein COT. Expression of TPL-2 results in phosphorylation and increased degradation of p105 while maintaining p50 production. This releases associated Rel subunits or p50-Rel heterodimers to generate active nuclear NF-kappaB. Furthermore, kinase-inactive TPL-2 blocks the degradation of p105 induced by tumour-necrosis factor-alpha. TPL-2 is therefore a component of a new signalling pathway that controls proteolysis of NF-kappaB1 p105.

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