Recognition of synthetic deoxy and deoxyfluoro analogs of the acceptor α-l-Fucp-(1 → 2)-β-d-Galp-OR by the blood-group A and B gene-specified glycosyltransferases
作者:Todd L. Lowary、Ole Hindsgaul
DOI:10.1016/0008-6215(93)84068-h
日期:1993.10
Abstract The disaccharide α- l -Fuc p -O-(CH 2 ) 7 CH 3 (6) , is an acceptor for both glycosyltransferases responsible for the biosynthesis of the A and B blood-group antigens. These enzymes transfer GalNAc and Gal, respectively, with an α-linkage to OH-3 of the Gal residue in 6 . All six possible deoxy and deoxyfluoro analogs of 6 , with modifications on the target Gal residue, were chemically synthesized
摘要二糖α-1-Fucp -O-(CH 2)7 CH 3(6)是负责A和B血型抗原生物合成的两个糖基转移酶的受体。这些酶分别将GalNAc和Gal转移至6中Gal残基的OH-3上,且具有α键。化学合成了6种在目标Gal残基上有修饰的6种可能的6种脱氧和脱氧氟类似物,并进行了动力学评估,作为A和B糖基转移酶的底物和抑制剂。两种酶都将耐受Gal残基的3和6位羟基的取代。但是,Gal残基的OH-4取代取代了这些糖基转移酶的识别。6脱氧和6氟化合物是这两种酶的底物,而3脱氧和3氟化合物是竞争性抑制剂,K i值在14–110μM范围内。已经确定了6-脱氧和6-氟衍生物的动力学常数。