Synthesis and conformational analysis of N-glycopeptides that contain extended sugar chains
作者:Laszlo Urge、David C. Jackson、Livia Gorbics、Krysztof Wroblewski、Graczyna Graczyk、Laszlo Otvos
DOI:10.1016/s0040-4020(01)86956-8
日期:1994.2
Maltooligosaccharides with 2-7 sugar moieties were converted into beta-1-amino-1-deoxy derivatives and were coupled to N-alpha-fluorenylmethoxycarbonyl-L-aspartic acid alpha-tert-butyl beta-pentafluorophenyl ester. After trifluoroacetic acid deprotection, the resulting glycosylated asparagines were used as building blocks for the solid-phase synthesis of T-cell epitopic glycopeptide analogues. The coupling efficiencies of the glycoamino acid synthons and the acid and base stability of the resulting glycopeptides indicate the applicability of this solid-phase synthetic protocol for the incorporation of sugars that are comparable in size with that of the natural carbohydrate antennae of N-glycoproteins. The sugars placed into N-terminal position did not affect the strong alpha-helical structure of the peptides, but inhibited the disulfide-bridge formation of proximal cysteine residues in a carbohydrate length-dependent manner.