Studies on vaccines against cholera. Synthesis of neoglycoconjugates from the hexasaccharide determinant of Vibriocholerae O:1, serotype Ogawa, by single-point attachment or by attachment of the hapten in the form of clusters
作者:Jian Zhang、Pavol Kováč
DOI:10.1016/s0008-6215(99)00185-8
日期:1999.10
The terminal hexasaccharide of the O-antigen of Vibrio cholerae O:1, serotype Ogawa, has been synthesized in the form of a glycoside whose aglycon (linker) allows conjugation to carrier proteins by reductive amination. The conjugate obtained from direct, single-point attachment of the linker-equipped hapten to chicken serum albumin (CSA) contained seven hapten residues/CSA. A neoglycoconjugate containing the carbohydrate antigen in the form of clusters was obtained using, as a hapten subcarrier, an oligopeptide containing 16 amino groups. It was treated with a limited amount of hapten, to give a hapten-carrying subcarrier (HCS). Subsequent conjugation of HCS to CSA, using squaric acid diethyl ester as a conjugation reagent, gave a cross-linked, glycocluster conjugate containing 51% (w/w) of the carbohydrate. Published by Elsevier Science Ltd.
Linking carbohydrates to proteins using N-(2,2-dimethoxyethyl)-6-hydroxy hexanamide
The title dimethylacetal 4 and related compounds can be efficiently synthesized by treatment of 6-caprolactone with commercially available dialkyl acetals. Conventional glucosylation using 4 as a glycosyl acceptor gave mainly β-glycosides which were deprotected to give 13. The latter was converted to the corresponding aldehyde 16, which was used as a hapten in conjugation, by reductive amination,
N-(2,2-dimethoxyethyl)-, N-(2,2-diethoxyethyl)-, and N-(4,4-diethoxybutyl)-6-hydroxy hexanamides as new linking agents for carbohydrates and proteins
作者:Jian Zhang、Pavol Kováč
DOI:10.1016/s0040-4039(97)10787-0
日期:1998.3
The title compounds have been conveniently synthesized by the addition reaction of epsilon-caprolactone and the corresponding readily available omega-aminoalkyl dialkyl acetals. The free aldehydes, formed from sugar glycosides bearing the described hexanamides as as aglycons, can be readily linked to proteins by reductive amination to give neoglycoconjugates. (C) 1998 Elsevier Science Ltd. All rights reserved.