A chemoenzymatic method for the preparation of a homogeneous glycoprotein or glycopeptide, including (a) providing an acceptor selected from the group consisting of GlcNAc-protein and GlcNAc-peptide; and (b) reacting the acceptor with a donor substrate including an activated oligosaccharide moiety, in the presence of a catalyst comprising endoglycosidase (ENGase), to transfer the oligosaccharide moiety to the acceptor and yield the homogeneous glycoprotein or glycopeptide. The donor substrate includes, in a specific implementation, a synthetic oligosaccharide oxazoline. A related method of glycoprotein or glycopeptide remodeling with a predetermined natural N-glycan or a tailor-made oligosaccharide moiety, and a method of remodeling an antibody including a heterogeneous sugar chain, are also described. The disclosed methodology enables glycoprotein drugs to be modified for prolonged half-life in vivo, reduced immunogenicity, and enhanced in vivo activity, and for targeting and drug delivery.
一种
化学酶法制备均一的糖蛋白或糖肽的方法,包括(a)提供一种选择自GlcNAc-蛋白质和GlcNAc-肽的受体;和(b)在内含有内切糖苷酶(ENGase)催化剂的情况下,将含有活化
寡糖基团的供体底物与受体反应,将
寡糖基团转移至受体并产生均一的糖蛋白或糖肽。在特定实施中,供体底物包括合成的
寡糖氧杂环。还描述了一种使用预定天然N-糖基或定制
寡糖基团进行糖蛋白或糖肽重塑的相关方法,以及一种重塑包括异质糖链的
抗体的方法。所披露的方法使得糖蛋白类药物能够被修改以实现在体内的延长半衰期、降低免疫原性、增强体内活性以及用于靶向和药物传递。