title: Multivalent engagement of TFIID to nucleosomes.
abstract: The process of eukaryotic transcription initiation involves the assembly of basal transcription factor complexes on the gene promoter. The recruitment of TFIID is an early and important step in this process. Gene promoters contain distinct DNA sequence elements and are marked by the presence of post-translationally modified nucleosomes. The contributions of these individual features for TFIID recruitment remain to be elucidated. Here, we use immobilized reconstituted promoter nucleosomes, conventional biochemistry and quantitative mass spectrometry to investigate the influence of distinct histone modifications and functional DNA-elements on the binding of TFIID. Our data reveal synergistic effects of H3K4me3, H3K14ac and a TATA box sequence on TFIID binding in vitro. Stoichiometry analyses of affinity purified human TFIID identified the presence of a stable dimeric core. Several peripheral TAFs, including those interacting with distinct promoter features, are substoichiometric yet present in substantial amounts. Finally, we find that the TAF3 subunit of TFIID binds to poised promoters in an H3K4me3-dependent manner. Moreover, the PHD-finger of TAF3 is important for rapid induction of target genes. Thus, fine-tuning of TFIID engagement on promoters is driven by synergistic contacts with both DNA-elements and histone modifications, eventually resulting in a high affinity interaction and activation of transcription.
authors.affiliation: Department of Molecular Cancer Research, University Medical Center Utrecht, Utrecht, The Netherlands ; Netherlands Proteomics Center, Utrecht, The Netherlands.
authors.forename: Rick
authors.initials: R
authors.lastname: van Nuland
authors.forename: Andrea W
authors.initials: AW
authors.lastname: Schram
authors.forename: Frederik M A
authors.initials: FM
authors.lastname: van Schaik
authors.forename: Pascal W T C
authors.initials: PW
authors.lastname: Jansen
authors.forename: Michiel
authors.initials: M
authors.lastname: Vermeulen
authors.forename: H T
authors.initials: HT
authors.lastname: Marc Timmers
mesh_terms: D000107:Acetylation; D001665:Binding Sites; D006657:Histones / Q000378:metabolism; D006801:Humans; D009707:Nucleosomes / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D016385:TATA Box; D035362:Transcription Factor TFIID / Q000737:chemistry / Q000378:metabolism*
chemical_list: D006657:Histones; D009707:Nucleosomes; D035362:Transcription Factor TFIID
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