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

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...

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Veröffentlicht in:Proc. Natl. Acad. Sci. USA 2014-06, Vol.111 (25), p.9103-9108
Hauptverfasser: Bhattacharya, Suparna, Lou, Xiaohua, Hwang, Peter, Rajashankar, Kanagalaghatta R., Wang, Xiaoping, Gustafsson, Jan-Åke, Fletterick, Robert J., Jacobson, Raymond H., Webb, Paul
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container_title Proc. Natl. Acad. Sci. USA
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creator Bhattacharya, Suparna
Lou, Xiaohua
Hwang, Peter
Rajashankar, Kanagalaghatta R.
Wang, Xiaoping
Gustafsson, Jan-Åke
Fletterick, Robert J.
Jacobson, Raymond H.
Webb, Paul
description 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.
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subjects acetyltransferases
Binding Sites
Biological Sciences
Cell lines
Chromatin
Cradles
DNA-directed RNA polymerase
Epigenetics
Eukaryotes
Genes
Histone Acetyltransferases - chemistry
Histones
Histones - chemistry
Humans
hydrophobicity
multiprotein complexes
Multiprotein Complexes - chemistry
Phosphorylation
Protein Binding
Protein Structure, Quaternary
Proteins
RNA
serine
TATA-Binding Protein Associated Factors - chemistry
transcription (genetics)
Transcription Factor TFIID - chemistry
Transcription factors
Yeast
Yeasts
title Structural and functional insight into TAF1–TAF7, a subcomplex of transcription factor II D
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