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| Content Provider | PubMed Central |
|---|---|
| Author | Nolan, G. P. Fujita, T. Bhatia, K. Huppi, C. Liou, H. C. Scott, M. L. Baltimore, D. |
| Abstract | The product of the putative proto-oncogene bcl-3 is an I kappa B-like molecule with novel binding properties specific for a subset of the rel family of transcriptional regulators. In vitro, Bcl-3 protein specifically inhibited the DNA binding of both the homodimeric NF-kappa B p50 subunit and a closely related homolog, p52 (previously p49), to immunoglobulin kappa NF-kappa B DNA motifs. Bcl-3 could catalyze the removal of these proteins from DNA. At concentrations that significantly inhibited DNA binding by homodimeric p50, Bcl-3 did not inhibit binding of reconstituted heterodimeric NF-kappa B (p50:p65), a DNA-binding homodimeric form of p65, or homodimers of c-Rel. Phosphatase treatment of Bcl-3 partially inactivated its inhibitory properties, implicating a role for phosphorylation in the regulation of Bcl-3 activity. Bcl-3, like p50, localizes to the cell nucleus. In cells cotransduced with Bcl-3 and p50, both molecules could be found in the nucleus of the same cells. Interestingly, coexpression of Bcl-3 with a p50 mutant deleted for its nuclear-localizing signal resulted in the relocalization of Bcl-3 to the cytoplasm, showing that the proteins interact in the cell. These properties contrast Bcl-3 to classically defined I kappa B, which maintains heterodimeric NF-kappa B p50:p65 in the cytoplasm through specific interactions with the p65 subunit. Bcl-3 appears to be a nuclear, I kappa B-related molecule that regulates the activity of homodimeric nuclear p50 and its homolog p52. |
| Starting Page | 3557 |
| File Format | |
| ISSN | 10985549 |
| e-ISSN | 10985549 |
| Journal | Molecular and Cellular Biology |
| Issue Number | 6 |
| Volume Number | 13 |
| Language | English |
| Publisher Date | 1993-06-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology |
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