Jun-Ichi Tamura, Takahiro Tamura, Shunsuke Hoshino, Rieko Imae, Ryuichi Kato, Mizuki Yokono, Mao Nagase, Shiho Ohno, Noriyoshi Manabe, Yoshiki Yamaguchi, Hiroshi Manya, Tamao Endo
Ribitol phosphate modifications to the core M3 O -mannosyl glycan are important for the functional maturation of α-dystroglycan. Three sequentially extended partial structures of the core M3 O -mannosyl glycan including a tandem ribitol phosphate were regio- and stereo-selectively synthesized: Rbo5P-3GalNAcβ, Rbo5P-1Rbo5P-3GalNAcβ, and Xylβ1-4Rbo5P-1Rbo5P-3GalNAcβ (Rbo5P, d-ribitol-5-phosphate; GalNAc, N -acetyl-d-galactosamine; Xyl, d-xylose). Rbo5P-3GalNAcβ with p -nitrophenyl at the aglycon part served as a substrate for ribitol phosphate transferase (FKRP, fukutin-related protein), and its product was glycosylated by the actions of a series of glycosyltransferases, namely, ribitol xylosyltransferase 1 (RXYLT1), β1,4-glucuronyltransferase 1 (B4GAT1), and like-acetyl-glucosaminyltransferase (LARGE)...
June 17, 2022: ACS Chemical Biology