A combined chemical and enzymatic strategy for the construction of carbohydrate-containing antigen core units
摘要:
Glycosidase-mediated coupling of glycal acceptors with galactose donors affords beta1,3-linked disaccharides that are versatile intermediates for further chemical and enzymatic manipulation. The utility of these disaccharides is demonstrated by the elaboration of these compounds into the type I and type IV core disaccharides of carbohydrate-containing antigens. Further conversion of the type IV disaccharide to a mucin-type trisaccharide (Galbeta1,3(GlcNAcbeta1,6)GalNAc) was accomplished with the use of a beta1,6-N-acetylglucosaminyltransferase. This combined use of enzymatic and chemical methodologies allows for the rapid assembly, with high regio- and stereoselectivity, of core oligosaccharides of biologically important glycoconjugates.
Enzymatic and Chemoenzymatic Syntheses of Disialyl Glycans and Their Necrotizing Enterocolitis Preventing Effects
作者:Hai Yu、Xuebin Yan、Chloe A Autran、Yanhong Li、Sabrina Etzold、Joanna Latasiewicz、Bianca M. Robertson、Jiaming Li、Lars Bode、Xi Chen
DOI:10.1021/acs.joc.7b02167
日期:2017.12.15
novel disialyl glycans have been designed and synthesized by enzymatic or chemoenzymatic methods. Noticeably, two disialyl tetraoses have been produced by enzymatic sialylation of chemically synthesized thioethyl β-disaccharides followed by removal of the thioethyl aglycon. Dose-dependent and single-dose comparison studies showed varying NEC-preventing effects of the disialyl glycans in neonatal rats