Structural and functional insight into TAF1-TAF7, a subcomplex of transcription factor II D

Suparna Bhattacharya, Xiaohua Lou, Peter Hwang, Kanagalaghatta R. Rajashankar, Xiaoping Wang, Jan Åke Gustafsson, Robert J. Fletterick, Raymond H. Jacobson, Paul Webb

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Transcription factor II D (TFIID) is a multiprotein complex that nucleates formation of the basal transcription machinery. TATA binding protein-associated factors 1 and 7 (TAF1 and TAF7), two subunits of TFIID, are integral to the regulation of eukaryotic transcription initiation and play key roles in preinitiation complex (PIC) assembly. Current models suggest that TAF7 acts as a dissociable inhibitor of TAF1 histone acetyltransferase activity and that this event ensures appropriate assembly of the RNA polymerase II-mediated PIC before transcriptional initiation. Here, we report the 3D structure of a complex of yeast TAF1 with TAF7 at 2.9 Å resolution. The structure displays novel architecture and is characterized by a large predominantly hydrophobic heterodimer interface and extensive cofolding of TAF subunits. There are no obvious similarities between TAF1 and known histone acetyltransferases. Instead, the surface of the TAF1-TAF7 complex contains two prominent conserved surface pockets, one of which binds selectively to an inhibitory trimethylated histone H3 mark on Lys27 in a manner that is also regulated by phosphorylation at the neighboring H3 serine. Our findings could point toward novel roles for the TAF1-TAF7 complex in regulation of PIC assembly via reading epigenetic histone marks.

Original languageEnglish (US)
Pages (from-to)9103-9108
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume111
Issue number25
DOIs
StatePublished - Jun 24 2014

Keywords

  • Initiation complex
  • Protein structure
  • Protein-protein interaction
  • X-ray crystallography

ASJC Scopus subject areas

  • General

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