We report that the heterotrimeric transcription factor NFY or 'CAAT- binding factor' binds the -60 region of the human H ferritin promoter, the B site. DNA binding analysis with specific antibodies demonstrates that NFY/B/C subunits tightly bind this site and that NFY/C subunit is masked in vivo by binding with other protein(s). NFY binds the co-activator p300. Specifically, the NFY/B subunit interacts with the central segment of p300 in vivo and in vitro. cAMP substantially increases the formation of the NFY·p300 complex. Taken together these data provide a general model of cAMP induction of non- CRE-containing promoters and suggest that the NFY-B·p300 complex is located at the 5' end of the promoter and the NFY-B·C·TFIIB on the 3' end toward the transcription start site.
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