Chondroitin sulfate N-acetylgalactosaminyltransferases 1 and 2 (CSGALNACT1 and 2) (Uyama et al. 2002, Gotoh et al. 2002) transfer N-acetylgalactosamine (GalNAc) from UDP-GalNAc to the glucuronate (GlcA) residue of the linker sequence. This first addition to the linker determines this GAG to be chondroitin. Chondroitin is comprised of the repeating disaccharide unit GalNAc-GlcA.
Gotoh, M, Sato, T, Akashima, T, Iwasaki, H, Kameyama, A, Mochizuki, H, Yada, T, Inaba, N, Zhang, Y, Kikuchi, N, Kwon, YD, Togayachi, A, Kudo, T, Nishihara, S, Watanabe, H, Kimata, K, Narimatsu, H
Uyama, T, Kitagawa, H, Tamura Ji, J, Sugahara, K
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