Carbohydrate sulfotransferase9, 11, 12 and 13 (CHST9, 11, 12 and 13) catalyse the transfer of sulfate from PAPS to position 4 of the N-acetylgalactosamine (GalNAc) residue of chondroitin (Kang et al. 2001, Okuda et al. 2000, Hiraoka et al. 2000, Kang et al. 2002 respectively).
Kuroiwa, A, Yamauchi, S, Yagi, F, Mita, S, Habuchi, O, Yamamori, D, Okuda, T, Matsuda, Y, Matsubara, T, Fukuta, M
Fukuda, M, Nakagawa, H, Akama, TO, Ong, E, Fukuda, MN, Hiraoka, N
Evers, MR, Xia, G, Baenziger, JU, Schachner, M, Kang, HG
chondroitin 4-sulfotransferase activity of CHST9,11,12,13 [Golgi membrane]
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