Structural insight into the recognition of the H3K4me3 mark by the TFIID subunit TAF3

van Ingen, H., van Schaik, F.M.A., Wienk, H., Ballering, J., Rehmann, H., Dechesne, A.C., Kruijzer, J.A.W., Liskamp, R.M.J. , Timmers, H.T.M. and Boelens, R. (2008) Structural insight into the recognition of the H3K4me3 mark by the TFIID subunit TAF3. Structure, 16(8), pp. 1245-1256. (doi:10.1016/j.str.2008.04.015)

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Abstract

Trimethylation of lysine residue K4 of histone H3 (H3K4me3) strongly correlates with active promoters for RNA polymerase II-transcribed genes. Several reader proteins, including the basal transcription factor TFIID, for this nucleosomal mark have been identified. Its TAF3 subunit specifically binds the H3K4me3 mark via its conserved plant homeodomain (PHD) finger. Here, we report the solution structure of the TAF3-PHD finger and its complex with an H3K4me3 peptide. Using a combination of NMR, mutagenesis, and affinity measurements, we reveal the structural basis of binding affinity, methylation-state specificity, and crosstalk with asymmetric dimethylation of R2. A unique local structure rearrangement in the K4me3-binding pocket of TAF3 due to a conserved sequence insertion underscores the requirement for cation-π interactions by two aromatic residues. Interference by asymmetric dimethylation of arginine 2 suggests that a H3R2/K4 “methyl-methyl” switch in the histone code dynamically regulates TFIID-promoter association.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Liskamp, Professor Robert
Authors: van Ingen, H., van Schaik, F.M.A., Wienk, H., Ballering, J., Rehmann, H., Dechesne, A.C., Kruijzer, J.A.W., Liskamp, R.M.J., Timmers, H.T.M., and Boelens, R.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Structure
Publisher:Elsevier
ISSN:0969-2126
ISSN (Online):1878-4186
Published Online:05 August 2008

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