B3GAT1 (Kitagawa et al. 1998) and B3GAT2 (Marcos et al. 2002) transfer a glucuronate (GlcA) residue via a beta1,3-linkage to a terminal galactose. The B3GATs are homodimeric and require manganese as a cofactor (Kakuda et al. 2004, Ouzzine et al. 2000). The tetrasaccharide linker is now complete, ready to accept further hexosamine additions. The type of hexosamine added is critical in determining which glycosaminoglycan (GAG) is formed.
Magdalou, J, Netter, P, Fournel-Gigleux, S, Gulberti, S, Ouzzine, M
Antiñolo, G, Marcos, I, Borrego, S, Galán, JJ
Ogawa, T, Neumann, KW, Kawasaki, T, Tamura, J, Kitagawa, H, Sugahara, K, Tone, Y, Oka, S
Wakatsuki, S, Kato, R, Kajihara, Y, Kawasaki, T, Ishiguro, M, Tagawa, H, Kakuda, S, Oka, S, Shiba, T
galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity of B3GAT dimers [Golgi membrane]
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