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).
核糖醇
磷酸对核心 M3 O -
甘露糖基聚糖的修饰对于α-肌营养不良聚糖的功能成熟很重要。包括串联
磷酸核糖醇在内的核心 M3 O -
甘露糖基聚糖的三个连续延伸的部分结构被区域选择性和立体选择性合成:Rbo5P-3GalNAcβ、Rbo5P-1Rbo5P-3GalNAcβ 和 Xylβ1-4Rbo5P-1Rbo5P-3GalNAcβ(Rbo5P,d -
核糖醇-5-
磷酸;GalNAc,N-乙酰基-d-半
乳糖胺;Xyl,d-
木糖)。Rbo5P-3GalNAcβ 与p苷元部分的-
硝基苯基作为
核糖醇
磷酸转移酶(FKRP,福库丁相关蛋白)的底物,其产物在一系列糖基转移酶的作用下被糖基化,即
核糖醇
木糖基转移酶1(RXYLT1)、β1,4-
葡萄糖醛酸转移酶 1 (B4GAT1) 和类似乙酰
氨基葡萄糖转移酶 (
LARGE)。配备
炔烃型糖苷配基的 Rbo5P-3GalNAcβ 对 FKRP 也有活性。在 FKRP