Synthesis and Biological Activities of Lipid A Analogs Possessing<i>β</i>-Glycosidic Linkage at 1-Position
作者:Koichi Fukase、Atsushi Ueno、Yoshiyuki Fukase、Masato Oikawa、Yasuo Suda、Shoichi Kusumoto
DOI:10.1246/bcsj.76.485
日期:2003.3
New lipid A analogs having acidic groups β-glycosidically linked at the 1-position were synthesized in order to investigate the structural requirement for immunostimulating and endotoxic activity of lipid A. The β-(phosphonoxy)ethyl (PE) and carboxymethyl (CM) analogs of Escherichia coli type having six acyl groups and those of the biosynthetic precursor type having four acyl groups were synthesized via a divergent synthetic route. The E. coli type β-(phosphonoxy)ethyl analog, which was previously reported to be not endotoxic, showed strong immunostimulating activity comparable to the natural-type α-analog. The acidic functional groups are concluded to be essential but their strict spatial arrangement is not required for expression of the biological activity.
为了研究脂质 A 的免疫刺激和内毒素活性的结构要求,我们合成了在 1 位上具有酸性基团 β-糖苷键的新型脂质 A 类似物。通过不同的合成路线,我们合成了具有六个酰基的大肠杆菌型 β-(膦酰氧基)乙基(PE)和羧甲基(CM)类似物,以及具有四个酰基的生物合成前体型类似物。大肠杆菌型 β-(膦酰氧基)乙基类似物以前曾被报道为无内毒素,它显示出与天然型 α 类似物相当的强免疫刺激活性。结论是酸性官能团是必不可少的,但其严格的空间排列并不是表达生物活性的必要条件。