Exploring the Effect of Bioisosteric Replacement of Carboxamide by a Sulfonamide Moiety on N-Glycosidic Torsions and Molecular Assembly: Synthesis and X-ray Crystallographic Investigation of N-(β-D-Glycosyl)sulfonamides as N-Glycoprotein Linkage Region An
作者:Amrita Srivastava、Babu Varghese、Duraikkannu Loganathan
DOI:10.1002/chem.201302018
日期:2013.12.23
sulfonamide moiety on the N‐glycosidic torsions as well as on molecular assembly, several glycosyl methanesulfonamides and glycosyl chloromethanesulfonamides were synthesized as analogues of the N‐glycoprotein linkage region, and crystal structures of seven of these compounds have been solved. A comparative analysis of this series of crystal structures as well as with those of the corresponding alkanamido
在所有真核生物中,N-糖蛋白连接区的成分,即2-乙酰氨基-2-脱氧-β - D-吡喃葡萄糖(GlcNAc)和天冬酰胺(Asn)都是保守的。为了更好地理解大自然选择GlcNAcβAsn作为连接区组成以及分子间和分子内碳水化合物与蛋白质的相互作用,对连接区构象进行详细的系统结构研究是必不可少的。较早的几种N-(β-甘露糖基糖基)烷基酰胺的晶体学研究表明,糖苷部分的结构变化比糖苷配基部分更受N-糖苷扭转ϕ N的影响。探索磺酰胺部分生物等位取代羧酰胺基对小鼠的影响N糖苷扭转以及分子组装过程中,合成了几种糖基甲磺酰胺和糖基氯甲磺酰胺作为N糖蛋白连接区的类似物,并且已经解析了其中7种化合物的晶体结构。对这一系列晶体结构以及相应的烷酰胺基衍生物的晶体结构的比较分析表明,N糖苷扭转to N并没有显着改变。与其他磺酰胺基类似物相比,GlcNAc的甲烷磺酰胺基和氯甲烷磺酰胺基衍生物显示出不同的糖苷配基构象。这