Abstract
Maturation of N-glycans from oligomannose to complex-type structures on cellular and secreted proteins is essential for the roles that these structures play in cell adhesion and recognition events in metazoan organisms (Haltiwanger and Lowe 2004; Moremen et al. 2012; Varki 1993). Critical steps in the N-glycan biosynthetic pathway include the trimming of glucose and mannose residues by processing α-glucosidases and α-mannosidases in the endoplasmic reticulum (ER) and Golgi complex to result in the Man3GlcNAc2 core structure necessary for conversion to complex-type N-glycans (Aebi et al. 2010; Moremen 2000; Moremen and Touster 1988, Moremen et al. 1994, 2012). The mammalian exo-α-mannosidases comprise two separate families of enzymes (CAZy glycosylhydrolase families 38 (GH38) and 47 (GH47) (Coutinho et al. 2003; Coutinho and Henrissat 1999)) that are distinguished by differences in sequence, protein structural domains, enzymatic characteristics, and catalytic mechanisms (Moremen 2000; Moremen and Touster 1988; Moremen and Molinari 2006; Moremen et al. 1994). The ER α-glucosidases (Roth et al. 2010) and GH47 α-mannosidases (Moremen and Molinari 2006) act to trim early glycan processing intermediates to Man5GlcNAc2-Asn structures prior to the action of MGAT1, which adds a single GlcNAc residue to the α1,3 branch of the tri-mannosyl core (Schachter 1991, 2000) (Fig. 116.1). Members of GH38, including Golgi a-mannosidase II and Golgi α-mannosidase IIx, reside in the Golgi complex (Igdoural et al. 1999) and act to cleave two additional terminal mannose residues (Man-α1,3Man and Man-α1,6Man) to yield the GlcNAcMan3GlcNAc2-Asn intermediate necessary for processing to complex-type structures (Moremen 2000, 2002; Moremen and Touster 1988). Other mammalian members the GH38 family of enzymes are catabolic enzymes in lysosomes and cytosol. This chapter is focused on the Golgi processing enzyme, Golgi α-mannosidase II (also known as α1,3-(α1,6)-mannosidase II, N-acetylglucosamine (GlcNAc) transferase I-dependent α1,3(α1,6)-mannosidase, mannosyl-oligosaccharide 1,3-1,6-α-mannosidase, and 1,3-(1,6)mannosyl-oligosaccharide α-d-mannohydrolase), and its roles in N-glycan maturation in the Golgi complex.
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Moremen, K.W., Nairn, A.V. (2014). Mannosidase, Alpha, Class 2a1 (MAN2A1, Golgi α-Mannosidase II). 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_85
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