Preparation and Characterization of Branched β-Cyclodextrins Having α-<scp>L</scp>-Fucopyranose and a Study of Their Functions
作者:Yuki NISHI、Toshiko TANIMOTO
DOI:10.1271/bbb.80609
日期:2009.3.23
Three positional isomers of 61,6n-di-O-(α-l-fucopyranosyl)-β-cyclodextrin [61,6n-di-O-(α-l-Fuc)-βCD, n=2–4] were chemically synthesized by using the corresponding authentic compounds, 61,6n-di-O-(tert-butyldimethylsilyl)-βCD (n=2–4) as fucosyl acceptors and 2,3,4-tri-O-benzyl-l-fucopyranosyl trichloroacetimidate as a fucosyl donor. Their structures were analyzed by HPLC, MS and NMR spectroscopy. The hemolytic activities of the α-l-Fuc-βCDs were lower than that of βCD, while the water solubility of these branched βCDs was much higher than that of βCD. The molecular interaction between these compounds and the fucose-binding lectin, Aleuria aurantia lectin (AAL), was investigated by using an optical biosensor based on the surface plasmon resonance (SPR) technique. The order of binding affinity, as a function of the fucose-binding position, was 61,64- > 61,63- > 61,62-di-O-(α-l-Fuc)-βCD > 6-O-(α-l-Fuc)-βCD.
利用相应的真品化合物,化学合成了 61,6n-di-O-(α-l-岩藻酰)-β-环糊精[61,6n-di-O-(α-l-Fuc)-βCD,n=2-4]的三种位置异构体、61,6n-二-O-(叔丁基二甲基硅烷基)-βCD(n=2-4)作为岩藻糖基受体,2,3,4-三-O-苄基-l-呋喃糖基三氯乙酰亚胺作为岩藻糖基供体。通过高效液相色谱、质谱和核磁共振光谱分析了它们的结构。α-l-Fuc-βCDs的溶血活性低于βCD,而这些支链βCDs的水溶性远高于βCD。利用基于表面等离子体共振(SPR)技术的光学生物传感器研究了这些化合物与岩藻糖结合凝集素(AAL)之间的分子相互作用。作为岩藻糖结合位置函数的结合亲和力顺序为 61,64- > 61,63- > 61,62-di-O-(α-l-Fuc)-βCD > 6-O-(α-l-Fuc)-βCD。