Abstract
Chemical modification of histone proteins by methylation plays a central role in chromatin regulation by recruiting epigenetic “readers” via specialized binding domains. Depending on the degree of methylation, the exact modified amino acid, and the associated reader proteins histone methylations are involved in the regulation of all DNA-based processes, such as transcription, DNA replication, and DNA repair. Here we present methods to identify histone methylation readers using a mass spectrometry–linked nucleosome affinity purification approach. We provide detailed protocols for the generation of semisynthetic methylated histones, their assembly into biotinylated nucleosomes, and the identification of methylation-specific nucleosome-interacting proteins from nuclear extracts via nucleosome pull-downs and label-free quantitative proteomics. Due to their versatility, these protocols allow the identification of readers of various histone methylations, and can also be adapted to different cell types and tissues, and other types of modifications.
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Acknowledgements
We would like to thank Ann-Christine König from the Helmholtz Zentrum München Research Unit Protein Science for help with the quantification of the label-free mass spectrometry data for the H3K4me3 and H3K9me3 dinucleosome pull-down experiments. The development of these protocols was supported by funding from the Human Frontiers Science Program Organization, the Medical Research Council (Grant No. MC_UP_1102/2), the European Research Council (ERC StG No. 309952), the Deutsche Forschungsgemeinschaft (DFG Project No. 431163844 and 213249687/SFB 1064), and the Helmholtz Gesellschaft to T.B.
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Tvardovskiy, A., Nguyen, N., Bartke, T. (2022). Identifying Specific Protein Interactors of Nucleosomes Carrying Methylated Histones Using Quantitative Mass Spectrometry. In: Margueron, R., Holoch, D. (eds) Histone Methyltransferases. Methods in Molecular Biology, vol 2529. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2481-4_16
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DOI: https://doi.org/10.1007/978-1-0716-2481-4_16
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