PC4 (activated RNA polymerase II transcription cofactor 4) is a transcriptional coactivator, possessing the ability to suppress promoter-driven as well as nonspecific transcription via its DNA binding activity. The repressive activity of PC4 on promoter-driven transcription is alleviated by transcription factor TFIIH. TFIIH protects promoters from PC4-mediated repression by relieving the topological constraint imposed by PC4 through the ERCC3 helicase activity.
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