13C-n.m.r.-spectral study of the mode of binding of Gd3+ to various glycopeptides
作者:Kilian Dill、Marsha E. Daman、Ron L. Batstone-Cunningham、Jean M. Lacombe、André A. Pavia
DOI:10.1016/0008-6215(83)88387-6
日期:1983.11
Natural-abundance, 13C-n.m.r. spectroscopy was used to study the mode of binding of Gd3+ to mono-O-glycosylated L-serine and tripeptides variously composed of Gly and L-Thr. When the amino and carboxyl groups of the amino acid are not blocked, strong interaction of Gd3+ with them is observed; this is also readily apparent with some related, nonglycosylated peptides. When the amino and carboxyl groups
使用自然丰度13C-nmr光谱研究Gd3 +与单-O-糖基化L-丝氨酸和由Gly和L-Thr组成的三肽的结合方式。当氨基酸的氨基和羧基没有被封闭时,观察到Gd3 +与它们的强相互作用;对于一些相关的,非糖基化的肽,这也是显而易见的。当氨基酸的氨基和羧基被封闭时,Gd3 +与含α-D-Galp的糖肽的糖苷氧原子(O-3)和O-2'以及与O-3和N-的显着相互作用观察到含有α-D-GalpNAc的糖肽的2'。与糖基的O-4'和O-6'弱相互作用也是可能的。尽管氨基酸受到保护,但这些金属离子与碳水化合物的相互作用仍可能在一定程度上被介导,