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PRMT1-dependent Labeling and Isolation of Histone H4 Through N-Mustard Analogs of S-Adenosyl-L-methionine.
Chembiochem : a European Journal of Chemical Biology 2018 November 15
Histones, the fundamental building blocks of nucleosomes, undergo post-translational modifications and play a major role in the regulation of transcriptional processes. While the significance of these modifications, including methylation, is widely recognized, little is known about the mechanisms that link such events. To improve our understanding of how protein methylation is intricately linked, we have developed novel N-mustard analogs of S-adenosyl-L-methionine (SAM) functionalized with azides and alkynes to serve as probes of biological methylation. Here, we demonstrate their ability to serve as effective cofactor mimics of SAM and to be enzymatically transferred by protein arginine methyltransferase 1 (PRMT1) to histone H4 with high site-selectively for its' target arginine 3 on the histone tail. Further incorporation of biotin through copper-catalyzed click chemistry permitted visualization and isolation of the analog-modified histone H4 from a complex mixture. This work validates the future utility of N-mustard analogs as probes of protein methylation events beyond PRMT1.
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