The syntheses of the triantennary cluster α-D-mannosides 16, 19, 23 and 24 and their capacities to inhibit mannose-dependent binding of E. coli HB 101 (pPKl4) are described. The cluster glycosides are formed by glycosylation of tris-(3-hydroxypropyl)nitromethane 13, and by linking of suitable mannoside derivatives via amide and thiourea bonds to tris-(2-carboxyethyl)nitromethane 17 and tris-(2-aminoethyl)amine 20. Functionalized mannosides are attached to the core molecules at the 6-position of the sugar ring to allow variation of the introduced aglycone moieties in order to compare their effects on the inhibitory potencies of the derived mannoside clusters. The 6-peptide-bridged cluster mannoside 19 displays the highest binding potency towards the type 1 fimbrial lectin of E. coli as tested by inhibition agglutination tests and ELISA.
描述了三触角簇α-
D-甘露糖苷16、19、23和24的合成及其抑制大肠杆菌HB 101 (pPK14)的
甘露糖依赖性结合的能力。簇糖苷是通过三-(3-羟丙基)
硝基甲烷 13 的糖基化,以及通过酰胺键和
硫脲键将合适的
甘露糖苷衍
生物与三-(2-羧乙基)
硝基甲烷 17 和三-(2-
氨基乙基)胺 20 连接而形成的功能化
甘露糖苷附着在糖环 6 位的核心分子上,以允许引入的糖苷配基部分发生变化,以便比较它们对衍生
甘露糖苷簇的抑制效力的影响。通过抑制凝集试验和 ELI
SA 测试,6 肽桥簇
甘露糖苷 19 对大肠杆菌 1 型菌毛凝集素显示出最高的结合效力。