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Lin, Shixian; Yang, Xiaoyu; Jia, Shang; Weeks, Amy M.; Hornsby, Michael; Lee, Peter S.; Nichiporuk, Rita V.; Iavarone, Anthony T.; Wells, James A.; Toste, F. Dean; Chang, Christopher J.
Science (American Association for the Advancement of Science), 02/2017, Volume: 355, Issue: 6325Journal Article
Cysteine can be specifically functionalized by a myriad of acid-base conjugation strategies for applications ranging from probing protein function to antibody-drug conjugates and proteomics. In contrast, selective ligation to the other sulfur-containing amino acid, methionine, has been precluded by its intrinsically weaker nucleophilicity. Here, we report a strategy for chemoselective methionine bioconjugation through redox reactivity, using oxaziridine-based reagents to achieve highly selective, rapid, and robust methionine labeling under a range of biocompatible reaction conditions. We highlight the broad utility of this conjugation method to enable precise addition of payloads to proteins, synthesis of antibody-drug conjugates, and identification of hyperreactive methionine residues in whole proteomes.
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