Enzymatic alpha-glucosaminylation of maltooligosaccharides catalyzed by phosphorylase.
This paper describes phosphorylase-catalyzed enzymatic alpha-glucosaminylation for the direct incorporation of a 2-amino-2-deoxy-alpha-D-glucopyranose unit into maltooligosaccharides. When the reaction of 2-amino-2-deoxy-alpha-D-glucopyranosyl 1-phosphate as the glycosyl donor with maltotetraose as a glycosyl acceptor was performed in the presence of phosphorylase, glucosaminylated oligosaccharides were produced, which were characterized by MALDI-TOF MS measurement after N-acetylation of the crude products. The N-acetylated derivative of the main product in this system was isolated by using HPLC, and its structure was confirmed by MS and (1)H NMR spectra. Furthermore, glucoamylase-catalyzed reaction of the isolated compound provided support that the alpha-glucosamine unit is positioned at the non-reducing end of the oligosaccharide.
Nawaji
Mutsuki
M
Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan.
Izawa
Hironori
H
Kaneko
Yoshiro
Y
Kadokawa
Jun-Ichi
J