title: p53 activates transcription by directing structural shifts in Mediator.
abstract: It is not well understood how the human Mediator complex, transcription factor IIH and RNA polymerase II (Pol II) work together with activators to initiate transcription. Activator binding alters Mediator structure, yet the functional consequences of such structural shifts remain unknown. The p53 C terminus and its activation domain interact with different Mediator subunits, and we find that each interaction differentially affects Mediator structure; strikingly, distinct p53-Mediator structures differentially affect Pol II activity. Only the p53 activation domain induces the formation of a large pocket domain at the Mediator-Pol II interaction site, and this correlates with activation of stalled Pol II to a productively elongating state. Moreover, we define a Mediator requirement for TFIIH-dependent Pol II C-terminal domain phosphorylation and identify substantial differences in Pol II C-terminal domain processing that correspond to distinct p53-Mediator structural states. Our results define a fundamental mechanism by which p53 activates transcription and suggest that Mediator structural shifts trigger activation of stalled Pol II complexes.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA.
authors.forename: Krista D
authors.initials: KD
authors.lastname: Meyer
authors.forename: Shih-Chieh
authors.initials: SC
authors.lastname: Lin
authors.forename: Carrie
authors.initials: C
authors.lastname: Bernecky
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Gao
authors.forename: Dylan J
authors.initials: DJ
authors.lastname: Taatjes
mesh_terms: D020285:Cryoelectron Microscopy; D016158:Genes, p53; D006367:HeLa Cells; D006801:Humans; D066298:In Vitro Techniques; D056892:Mediator Complex / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D008954:Models, Biological; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D011401:Promoter Regions, Genetic; D054730:Protein Interaction Domains and Motifs; D011499:Protein Processing, Post-Translational; D012319:RNA Polymerase II / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D051758:Transcription Factor TFIIH / Q000737:chemistry / Q000378:metabolism; D015533:Transcriptional Activation; D016159:Tumor Suppressor Protein p53 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure
chemical_list: D056892:Mediator Complex; D011994:Recombinant Proteins; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; D051758:Transcription Factor TFIIH; D012319:RNA Polymerase II
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