Building blocks for glycoproteins: Synthesis of the ribonuclease B fragment 21–25 containing an undecasaccharide N-glycan
作者:Carlo Unverzagt
DOI:10.1016/s0040-4039(97)01278-1
日期:1997.8
A glycosylated fragment of the bovine glycoprotein ribonuclease B (1) was synthesized corresponding to amino acids 21-25 with a complex type biantennary N-glycan linked to Asn(24). The total synthesis of the undecasaccharide-glycopentapeptide 1 was accomplished by modem solution phase glycopeptide chemistry combined with enzymatic techniques for the removal of protective groups and a regio- and stereoselective transfer of the terminal carbohydrates using glycosyltransferases. (C) 1997 Elsevier Science Ltd.
Synthesis of an Fmoc-Asn-heptasaccharide building block and its application to chemoenzymatic glycopeptide synthesis
作者:Stefano Mezzato、Carlo Unverzagt
DOI:10.1016/j.carres.2010.02.022
日期:2010.7
heptasaccharide asparagine buildingblock beta-GlcNAc-(1-->2)-alpha-Man-(1-->3)-[beta-GlcNAc-(1-->2)-alpha-Man-(1-->6)]beta -Man-(1-->4)-beta-GlcNAc-(1-->4)-beta-GlcNAc-(Fmoc)Asn was obtained by chemical synthesis. Two flexible strategies were developed with optimized conditions for the simultaneous debenzylation of the sugar and the amino acid part. The heptasaccharide asparagine buildingblock is a partial structure