title: Candidate proto-oncogene bcl-3 encodes a subunit-specific inhibitor of transcription factor NF-kappa B.
abstract: The NF-kappa B subunits p50 and p65 and the product of the rel proto-oncogene are members of a growing class of transcription factors with a unique DNA-binding and dimerization domain. Nuclear transfer of each of these factors is controlled by cytoplasmic inhibitors, and regulated by specific stimuli. The inhibitors I kappa B-alpha and -beta and pp40 recognize either p65 or the c-rel protein. We show here that the proto-oncogene bcl-3, believed to be involved in certain human B-cell leukaemias, encodes a protein that functions as an I kappa B-like molecule for native NF-kappa B but is specific for the p50 subunit. The ankyrin repeat domain of the bcl-3 product is shown to mediate complex formation with NF-kappa B dimers by contracting the conserved dimerization domain of NF-kappa B.
authors.affiliation: Otto Warburg Laboratorium, Max Planck Institut für Molekulare Genetik, Berlin, Germany.
authors.forename: F G
authors.initials: FG
authors.lastname: Wulczyn
authors.forename: M
authors.initials: M
authors.lastname: Naumann
authors.forename: C
authors.initials: C
authors.lastname: Scheidereit
mesh_terms: D000081242:B-Cell Lymphoma 3 Protein; D002467:Cell Nucleus / Q000378:metabolism; D002846:Chromatography, Affinity; D002872:Chromosome Deletion; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006367:HeLa Cells; D051863:Host Cell Factor C1; D006801:Humans; D046911:Macromolecular Substances; D016328:NF-kappa B / Q000037:antagonists & inhibitors*; D050811:Octamer Transcription Factor-1; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000378:metabolism*; D011519:Proto-Oncogenes; D011994:Recombinant Proteins / Q000378:metabolism; D012091:Repetitive Sequences, Nucleic Acid; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D000081242:B-Cell Lymphoma 3 Protein; C000631344:BCL3 protein, human; D004268:DNA-Binding Proteins; C497692:HCFC1 protein, human; D051863:Host Cell Factor C1; C000715470:MAS1 protein, human; D046911:Macromolecular Substances; D016328:NF-kappa B; D050811:Octamer Transcription Factor-1; C494165:POU2F1 protein, human; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D011994:Recombinant Proteins; D014157:Transcription Factors; D013755:Tetradecanoylphorbol Acetate