Preparation and biological activity of manno- and galacto-validamines, new 5a-carba-glycosylamines as α-glycosidase inhibitors
作者:Yukihiko Kameda、Kanae Kawashima、Masayoshi Takeuchi、Kyoko Ikeda、Naoki Asano、Katsuhiko Matsui
DOI:10.1016/s0008-6215(97)00052-9
日期:1997.5
Manno- and galacto-validamines, which are epimers of validamine, were semi-synthesized by the configurational inversion of validamine, a pseudo-sugar analogue of alpha-D-glucopyranose that has inhibitory activity for alpha-glucosidases. The inhibitory activities of these analogues were determined against several mannosidases and galactosidases. Manno-validamine shows potent inhibition for the alpha-mannosidases (competitive, K-i = 4.6 x 10(-5) M for jack beans, and competitive, K-i = 2.8 x 10(-5) M for almonds), and galacto-validamine shows weak inhibition for the alpha-galactosidases (coffee bean and E. coli). The inhibitory effect of the epimers on the N-linked oligosaccharide-processing mannosidases involved in glycoprotein biosynthesis and lysosomal mannosidase from rat liver were also examined. Mannovalidamine shows potent inhibition on the endoplasmic reticulumal alpha-mannosidase (competitive, K-i = 1.2 x 10(-6) M), Golgi mannosidases IA, II (competitive, K-i = 2.8 x 10(-5) M), and lysosomal alpha-mannosidase (competitive, K-i = 1.7 x 10(-5) M). (C) 1997 Elsevier Science Ltd.