Glycosyl-transferase catalyzed assemblage of sialyl-lewis x -saccharopeptides
摘要:
A series of glycohexopyranuronic acids are coupled to glucosamines to give 'disaccharides' which have the natural N-acetyl group of the glcNAc-moiety replaced by various sugar acids (-->saccharopeptides). These saccharopeptides are surprisingly good substrates for beta(1-4)galactosyl-transferase, alpha(2-3)sialyl-transferase, and fucosyl-transferase VI. The enzymes transfer successively galactose, sialic acid, and fucose from the corresponding donors onto these acceptor substrates-despite the far reaching alterations-regio- and stereospecifically in the expected manner to yield a new class of compounds, the sialyl-Lewis(x)-saccharopeptides. (C) 1998 Elsevier Science Ltd. All rights reserved.
Glycosyl-transferase catalyzed assemblage of sialyl-lewis x -saccharopeptides
摘要:
A series of glycohexopyranuronic acids are coupled to glucosamines to give 'disaccharides' which have the natural N-acetyl group of the glcNAc-moiety replaced by various sugar acids (-->saccharopeptides). These saccharopeptides are surprisingly good substrates for beta(1-4)galactosyl-transferase, alpha(2-3)sialyl-transferase, and fucosyl-transferase VI. The enzymes transfer successively galactose, sialic acid, and fucose from the corresponding donors onto these acceptor substrates-despite the far reaching alterations-regio- and stereospecifically in the expected manner to yield a new class of compounds, the sialyl-Lewis(x)-saccharopeptides. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis of linear-B saccharopeptides via enzymatic galactosylation of non-natural glucosamide acceptors
作者:Oliver Schwardt、Gabi Baisch、Reinhold Öhrlein
DOI:10.1016/s0968-0896(01)00086-4
日期:2001.7
A series of D- and L-glycopyranuronic acids are coupled to glucosamines to give saccharopeptides. These 'disaccharides'. in which the acetyl moiety of the natural N-acetyl-glucosamine is replaced by various sugar acids, turned out to be surprisingly good substrates for beta (1-4)-galactosyl-transferase and alpha (1-3)-galactosyl-transferase. The enzymes transfer successively two galactose units from the donor UDP-galactose onto these acceptor substrates. despite the far reaching, alterations, regio- and stereospecifically in the expected manner to give linear-B saccharopeptides. (C) 2001 Elsevier Science Ltd. All rights reserved.