Retinoic acid receptor-beta: immunodetection and phosphorylation on tyrosine residues.
1992
Polyclonal (RP) and monoclonal (Ab) antibodies were raised against synthetic peptides (or fusion proteins) corresponding to amino acid sequences unique to human and mouse retinoic acid receptor-beta (RAR beta) isoforms. Antibodies directed against the A2 region [Ab6 beta 2(A2), Ab7 beta 2(A2), and RP beta 2(A2)], the D2 region [RP beta(D2)], or the F region [Ab8 beta(F)2, RP beta(F)1, and RP beta(F)2] were selected. The monoclonal and polyclonal antibodies directed against the D2 and F regions specifically immunoprecipitated and recognized by Western blotting all human and mouse RAR beta isoforms (mRAR beta 1, -beta 2, -beta 3, and -beta 4), produced in COS-1 cells transfected with expression vectors containing the corresponding RAR beta cDNA. Furthermore, in gel retardation assays, the monoclonal antibodies supershifted RAR beta protein-RA response element oligonucleotide complexes. Antibodies directed against the A2 region were specific for the RAR beta 2 isoform. The above antibodies allowed us to dete...
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