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Many glycoproteins cannot be secreted or expressed without appropriate glycosylation and subsequent deglucosylation in the endoplasmic reticulum (ER), making α-glucosidase activity important to proper cell function.1 α-Glucosidases I and II remove glucose residues from N-linked oligosaccharides attached to nascent glycoproteins in the ER enabling transit to the Golgi in their properly folded form. 1-Deoxynojirimycin (hydrochloride) (1-dNM (hydrochloride)), produced by Bacillus species, is a glucose analog that potently inhibits α-glucosidase I and II. It prevents the formation of complex N-linked oligosaccharides in yeast and intact mammalian cells by inhibiting both α-glucosidase I and II with IC50 values of ~2 µM.2,3 The FDA has granted orphan drug designation to dNM (hydrochloride) for the treatment of Pompe disease, an inherited lysosomal storage disorder caused by a mutation that alters the structure and stability of α-glucosidase. 1-dNM at a concentration 0.4 mM also inhibits virus spread in HIV-infected lymphocyte cultures by interfering with α-glucosidase activity.4,5
1
Lodish, H.F., and Kong, N. Glucose removal from N-linked oligosaccharides is required for efficient maturation of certain secretory glycoproteins from the rough endoplasmic reticulum to the Golgi complex. J Cell Biol981720-1729(1984).
2
Suanier, B., Kilker, R.D., Tkacz, J.S., et al. Inhibition of N-linked complex oligosaccharide formation by 1-deoxynojirimycin, an inhibitor of processing glucosidases. J Biol Chem257(23)14155-14161(1982).
3
Suh, K., Gabel, C.A., and Bergmann, J.E. Identification of a novel mechanism for the removal of glucose residues from high mannose-type oligosaccharides. J Biol Chem267(30)21671-21677(1992).
4
Montefiori, D.C., Robinson, W.E., and Mitchell, W.M. Role of protein N-glycosylation in pathogenesis of human immunodeficiency virus type 1. Proc Natl Acad Sci USA859248-9252(1988).
5
Papandréou, M., Barbouche, R., Guieu, R., et al. The a-glucosidase inhibitor 1-deoxynojirimycin blocks human immunodeficiency virus envelope glycoprotein-mediated membrane fusion at the CXCR4 binding step. Mol Pharmacol61186-193(2002).
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Background Reading
Montefiori, D.C., Robinson, W.E., and Mitchell, W.M. Role of protein N-glycosylation in pathogenesis of human immunodeficiency virus type 1. Proc Natl Acad Sci USA859248-9252(1988).
Suh, K., Gabel, C.A., and Bergmann, J.E. Identification of a novel mechanism for the removal of glucose residues from high mannose-type oligosaccharides. J Biol Chem267(30)21671-21677(1992).
Lodish, H.F., and Kong, N. Glucose removal from N-linked oligosaccharides is required for efficient maturation of certain secretory glycoproteins from the rough endoplasmic reticulum to the Golgi complex. J Cell Biol981720-1729(1984).
Suanier, B., Kilker, R.D., Tkacz, J.S., et al. Inhibition of N-linked complex oligosaccharide formation by 1-deoxynojirimycin, an inhibitor of processing glucosidases. J Biol Chem257(23)14155-14161(1982).
Papandréou, M., Barbouche, R., Guieu, R., et al. The a-glucosidase inhibitor 1-deoxynojirimycin blocks human immunodeficiency virus envelope glycoprotein-mediated membrane fusion at the CXCR4 binding step. Mol Pharmacol61186-193(2002).