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The histone folds in transcription factor TFIID
1Laboratory of Molecular Growth Regulation, NICHD, National Institutes of Health, Bethesda, Maryland 20892-2753, USA.
Abstract:
The transcription factor TFIID is a multimeric protein complex containing the TATA box-binding polypeptide (TBP) and TBP-associated factors. We have previously reported that the N-terminal regions of dTAFII62 and dTAFII42 have sequence similarities with histones H4 and H3. Here, we demonstrate that the histone-homologous regions of dTAFII62 and dTAFII42 form a heteromeric complex both in vitro and in a yeast two-hybrid system. Neither dTAFII62 nor dTAFII42 forms a homomeric complex, in agreement with a nucleosomal histone character. Moreover, circular dichroism measurements show that the heteromeric complex is dominated by alpha-helical secondary structure. These results strongly suggest the existence of a histone-like surface on TFIID.
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