Abstract:
:The NF-kappa B precursor p100 (lyt-10, p97, p98) generates after proteolytic processing a 52 kDa subunit, which can bind to kappa B-motifs. A deregulated form of the p100 gene, which is structurally altered by a t(10;14) translocation, has a potential oncogenic role in certain human B cell lymphomas. In this study p100 was analysed for its ability to interact with its own processing product p52, with p50, the product of the NF-kappa B precursor p105, and with other NF-kappa B/rel-proteins. As demonstrated by a combination of Western blot analysis, band shift analysis and indirect immunofluorescence labelling of transfected cells, p100 itself was localized in the cytoplasm and indiscriminately retained each co-expressed NF-kappa B subunit. Thereby it simultaneously inhibited their DNA binding activities. Thus, a major function of p100 is, like p105, to associate with subunits of the rel multigene family in the cytoplasm in an I kappa B-like fashion. The similarity between p100 and p105 is also reflected by equivalent protein interactions of their processing products: like NF-kappa B-p50, also NF-kappa B-p52 heteromerised promiscuously with all rel-factors tested. Moreover, p52 efficiently interacts with the candidate oncogene product Bcl-3 and also binds to the basic-leucine zipper protein NF-IL6.
journal_name
Oncogenejournal_title
Oncogeneauthors
Naumann M,Nieters A,Hatada EN,Scheidereit Csubject
Has Abstractpub_date
1993-08-01 00:00:00pages
2275-81issue
8eissn
0950-9232issn
1476-5594journal_volume
8pub_type
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