Abstract
A FEW general transcription factors, in particular TFIID and TFIIB, have been found to bind transcriptional activators1. Here we show that the general transcription factor TFIIF is also a target for a transcriptional activator, namely serum response factor (SRF), which binds to the c-fos promoter. Using a yeast interaction assay, we find that SRF binds the RAP74 subunit of TFIIF and that SRF's transcriptional activation domain is the region involved in this binding. Further, RAP74's central charged cluster domain is required for binding to SRF's activation domain. Deletion of this domain impairs RAP74's ability to support SRF-activated transcription in vitro but has little effect on the protein's basal transcription activity or its ability to support SP1-activated transcription. The correlation of SRF–RAP74 binding with transcriptional activation suggests that RAP74 is a critical target for SRF-activated transcription.
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Joliot, V., Demma, M. & Prywes, R. Interaction with RAP74 subunit of TFIIF is required for transcriptional activation by serum response factor. Nature 373, 632–635 (1995). https://doi.org/10.1038/373632a0
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DOI: https://doi.org/10.1038/373632a0
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