chondroitin(1)-core proteins GlcA-Gal-Gal-Xyl-CS proteins The addition of GalNAc to the terminal glucuronate residue forms chondroitin Authored: Jassal, B, 2011-11-04 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. EC Number: 2.4.1.175 Edited: Jassal, B, 2011-11-04 Pubmed11788602 Pubmed12163485 Reactome Database ID Release 431971482 Reactome, http://www.reactome.org ReactomeREACT_120769 Reviewed: D'Eustachio, P, 2012-03-28