The Enzyme Database

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Accepted name: protein O-mannose β-1,3-N-acetylgalactosaminyltransferase
Reaction: UDP-N-acetyl-α-D-galactosamine + 3-O-[N-acetyl-β-D-glucosaminyl-(1→4)-α-D-mannosyl]-L-threonyl-[protein] = UDP + 3-O-[N-acetyl-β-D-galactosaminyl-(1→3)-N-acetyl-β-D-glucosaminyl-(1→4)-α-D-mannosyl]-L-threonyl-[protein]
For diagram of glycoprotein biosynthesis, click here
Other name(s): B3GALNT2
Systematic name: UDP-N-acetyl-α-D-galactosamine:N-acetyl-β-D-glucosaminyl-(1→4)-α-D-mannosyl-threonyl-[protein] 3-β-N-acetyl-D-galactosaminyltransferase
Comments: The human protein is specific for UDP-N-acetyl-α-D-galactosamine as donor [1]. The enzyme is involved in the formation of a phosphorylated trisaccharide on a threonine residue of α-dystroglycan, an extracellular peripheral glycoprotein that acts as a receptor for extracellular matrix proteins containing laminin-G domains.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Hiruma, T., Togayachi, A., Okamura, K., Sato, T., Kikuchi, N., Kwon, Y.D., Nakamura, A., Fujimura, K., Gotoh, M., Tachibana, K., Ishizuka, Y., Noce, T., Nakanishi, H. and Narimatsu, H. A novel human β1,3-N-acetylgalactosaminyltransferase that synthesizes a unique carbohydrate structure, GalNAcβ1-3GlcNAc. J. Biol. Chem. 279 (2004) 14087–14095. [PMID: 14724282]
2.  Yoshida-Moriguchi, T., Willer, T., Anderson, M.E., Venzke, D., Whyte, T., Muntoni, F., Lee, H., Nelson, S.F., Yu, L. and Campbell, K.P. SGK196 is a glycosylation-specific O-mannose kinase required for dystroglycan function. Science 341 (2013) 896–899. [PMID: 23929950]
[EC created 2013]

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