The Metabolic Chemical Reporter 6-Azido-6-deoxy-glucose Further Reveals the Substrate Promiscuity of O-GlcNAc Transferase and Catalyzes the Discovery of Intracellular Protein Modification by O-Glucose

Journal of the American Chemical Society
Narek DarabedianMatthew R Pratt

Abstract

Metabolic chemical reporters of glycosylation in combination with bioorthogonal reactions have been known for two decades and have been used by many different research laboratories for the identification and visualization of glycoconjugates. More recently, however, they have begun to see utility for the investigation of cellular metabolism and the tolerance of biosynthetic enzymes and glycosyltransferases to different sugars. Here, we take this concept one step further by using the metabolic chemical reporter 6-azido-6-deoxy-glucose (6AzGlc). We show that treatment of mammalian cells with the per- O-acetylated version of 6AzGlc results in robust labeling of a variety of proteins. Notably, the pattern of this labeling was consistent with O-GlcNAc modifications, suggesting that the enzyme O-GlcNAc transferase is quite promiscuous for its donor sugar substrates. To confirm this possibility, we show that 6AzGlc-treatment results in the labeling of known O-GlcNAcylated proteins, that the UDP-6AzGlc donor sugar is indeed produced in living cells, and that recombinant OGT will accept UDP-6AzGlc as a substrate in vitro. Finally, we use proteomics to first identify several bona fide 6AzGlc-modifications in mammalian cells and then an en...Continue Reading

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