Abstract
Histone acetylation plays an important role in transcriptional activation. Histones are also modified by chemically diverse acylations that are frequently deposited by p300, a transcriptional coactivator that uses a number of different acyl-CoA cofactors. Here we report that while p300 is a robust acetylase, its activity gets weaker with increasing acyl-CoA chain length. Crystal structures of p300 in complex with propionyl-, crotonyl-, or butyryl-CoA show that the aliphatic portions of these cofactors are bound in the lysine substrate-binding tunnel in a conformation that is incompatible with substrate transfer. Lysine substrate binding is predicted to remodel the acyl-CoA ligands into a conformation compatible with acyl-chain transfer. This remodeling requires that the aliphatic portion of acyl-CoA be accommodated in a hydrophobic pocket in the enzymes active site. The size of the pocket and its aliphatic nature exclude long-chain and charged acyl-CoA variants, presumably explaining the cofactor preference for p300.
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Acknowledgements
We thank the staff of ESRF and EMBL-Grenoble for assistance and support in using beamlines ID29, 23-1 and 23-2 and the HTX facility. We thank L. Signor (IBS, Grenoble) and P. Phapale (EMBL) for MS analysis. This work used the platforms of the Grenoble Instruct centre (ISBG; UMS 3518 CNRS-CEA-UJF-EMBL) with support from FRISBI (ANR-10-INSB-05-02) and GRAL (ANR-10-LABX-49-01) within the Grenoble Partnership for Structural Biology (PSB). Z.K. was supported by a fellowship from the EMBL Interdisciplinary Postdoc Programme under Marie Skłodowska-Curie actions Cofund (grant agreement number 291772). This work was supported by the ANR Grant Episperm3 (ANR-15-CE12- 0005-02) to S. Khochbin and D.P. and the Worldwide Cancer Research foundation (grant #16-0280) to D.P. Work in S. Khochbin's laboratory is supported by INCa, Fondation pour la Recherche Médicale and Fondation ARC. Work in Y.Z.'s laboratory is supported by NIH grants GM105933, DK107868 and GM115961.
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Z.K. performed the structure determination of p300 under supervision of J.A.M. and D.P. E.O. and Z.K. performed biochemical assays. E.O. prepared the constructs and performed protein expression and purification. A.G. performed the IP–HAT experiments under the supervision of S. Khochbin. H.H. and S. Kim performed MS experiments under the supervision of Y.Z. D.P. designed and coordinated the project, advised and assisted on all aspects of the project and wrote the manuscript. All authors discussed the results and commented on the manuscript.
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Supplementary Results, Supplementary Table 1 and Supplementary Figures 1–7. (PDF 1196 kb)
Supplementary Note
Annotated MS/MS spectra of for histone KAc from experiments shown in Figure 5. (PDF 2579 kb)
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Kaczmarska, Z., Ortega, E., Goudarzi, A. et al. Structure of p300 in complex with acyl-CoA variants. Nat Chem Biol 13, 21–29 (2017). https://doi.org/10.1038/nchembio.2217
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DOI: https://doi.org/10.1038/nchembio.2217