Abstract
GlcNAc-1-phosphotransferase catalyzes the transfer of a GlcNAc-1-phosphate residue from UDP-GlcNAc to C6 positions of selected mannoses in high-mannose-type oligosaccharides of the hydrolases (Goldberg and Kornfeld 1981; Natowicz et al. 1982; Varki and Kornfeld 1983). At a biological level this reaction is followed by the removal of the terminal GlcNAc by an N-acetylglucosamine-1-phosphodiester α-N-acetyl-glucosaminidase, usually referred to as “uncovering enzyme” (UCE; see Chap. 78, “Hyaluronan Synthase 1-3 (HAS1-3)”; Article ID: 332135). Sequential action of these two enzymes results in the formation of the mannose-6-phosphate (Man-6-P) marker, a specific tag acquired by lysosomal hydrolases that ensures recognition by M6P receptors and delivery to the endosomal/lysosomal system (Braulke and Bonifacino 2009).
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Coutinho, M.F. (2014). N-Acetylglucosamine-1-Phosphate Transferase, Alpha/Beta and Gamma Subunits (GNPTAB, GNPTG). In: Taniguchi, N., Honke, K., Fukuda, M., Narimatsu, H., Yamaguchi, Y., Angata, T. (eds) Handbook of Glycosyltransferases and Related Genes. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54240-7_101
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