Convenient enzymatic synthesis of a p-nitrophenyl oligosaccharide series of sialyl N-acetyllactosamine, sialyl Lex and relevant compounds
作者:Xiaoxiong Zeng、Hirotaka Uzawa
DOI:10.1016/j.carres.2005.08.019
日期:2005.11
From the beta-D-Gal-(1-->4)-beta-D-GlcNAc-OC6H4NO2-p (1) prepared by the transglycosylation of beta-galactosidase from Bacillus circulans, alpha-D-Neu5Ac-(2-->3)-beta-D-Gal-(1-->4)-beta-D-GlcNAc-OC6H4NO2-p (9) and alpha-D-Neu5Ac-(2-->6)-beta-D-Gal-(1-->4)-beta-D-GlcNAc-OC6H4NO2-p (10) were effectively synthesized with an equimolar ratio of CMP-Neu5Ac by recombinant rat alpha-(2-->3)-N-sialyltransferase
Enzymatic Synthesis of Oligosaccharides Containing Gal<i>β</i>→4Gal Disaccharide at the Non-Reducing End Using<i>β</i>-Galactanase from<i>Penicillium citrinum</i>
The transglycosylation reaction was done with a beta-galactanase from Penicillium citrinum. The regioselectivity in the transglycosylation reaction was studied using soy bean arabinogalactan as a donor and mono- or disaccharide derivatives containing beta-galactosyl residue as acceptors. We also synthesized oligosaccharides containing Gal beta 1-->4Gal sequence such as Gal beta 1-->4Gal beta1-->4Glc
Galβ1→4 disaccharide structures are vital core units of the oligosaccharide components of glycoconjugates. β-Galactosidase fromBacilluscirculans (E.C.3.2.1.23) catalyses the transfer of galactose from a donor structure such as GalβOpNP to various GlcNAc and galactose derivatives, forming β1→4 linkages. The synthesis of several biologically relevant disaccharides Galβ1→4GlcNAcαOAll (3), Galβ1→4GlcNAcβOAll