First chemical synthesis of triglucosylated tetradecasaccharide (Glc3Man9GlcNAc2), a common precursor of asparagine-linked oligosaccharides
摘要:
Triglucosylated high-mannose-type tetradeca saccharide (Glc(3)Man(9)GlcNAc(2)), the oligosaccharide part of the donor substrate of oligosaccharyl transferase (OST) complex, and diglucosylated tridecasaccharide (Glc(2)Man(9)GlcNAc(2)) were synthesized. These oligosaccharides were assembled in a convergent and stereoselective manner. Undecasaccharide 5 was employed as the common intermediate, and coupling with trisaccharide (4) and disaccharide (3) donor afforded fully protected tetradeca-(17) and tridecasaccharide (16), respectively. These oligosaccharides were deprotected to give Glc(3)Man(9)GlcNAc(2) and Glc(2)Man(9)GlcNAc(2), respectively. (c) 2005 Elsevier Ltd. All rights reserved.
Top-Down Chemoenzymatic Approach to a High-Mannose-Type Glycan Library: Synthesis of a Common Precursor and Its Enzymatic Trimming
作者:Akihiko Koizumi、Ichiro Matsuo、Maki Takatani、Akira Seko、Masakazu Hachisu、Yoichi Takeda、Yukishige Ito
DOI:10.1002/anie.201301613
日期:2013.7.15
From the stacks: A novel method for construction of a high‐mannose‐typeglycanlibrary by systematic enzymatic trimming of a single synthetic Man9‐based precursor was developed. Efficient chemical synthesis of the tetradecasaccharide common precursor and orthogonal enzymatic trimming to obtain all M8‐9 and G1M8‐9 derivatives was demonstrated. G=glucose, M=mannose.
从堆栈中:开发了一种通过对单个合成的基于Man 9的前体进行系统化酶切来构建高甘露糖型聚糖文库的新方法。证明了十四碳糖共同前体的有效化学合成和正交酶修整可得到所有M 8-9和G 1 M 8-9衍生物。G =葡萄糖,M =甘露糖。