Galactose-derived phosphonate analogues as potential inhibitors of phosphatidylinositol biosynthesis in mycobacteria
作者:Zoran Dinev、Carlie T. Gannon、Caroline Egan、Jacinta A. Watt、Malcolm J. McConville、Spencer J. Williams
DOI:10.1039/b616450a
日期:——
(at concentrations up to 1 mM) involved in phosphatidylinositol mannoside biosynthesis in a cell-free extract of Mycobacterium smegmatis. The galactose-derived phosphonate analogue of phosphatidylinositol was shown to be an inhibitor at 0.01 mM of PimA mannosyltransferase involved in the synthesis of phosphatidylinositol mannoside from phosphatidylinositol, and a weaker inhibitor of the next mannosyltransferase(s)
由甲基β-d-吡喃半乳糖苷合成了肌醇-1-磷酸和磷脂酰肌醇的基于半乳糖的膦酸酯类似物。亚磷酸异丙基二苯酯或亚磷酸三异丙基酯与6-碘-3,4-异亚丙基半乳糖苷的Michaelis-Arbuzov反应得到相应的膦酸酯。将二苯基膦酸酯脱保护,得到β-d-半乳糖苷6-膦酸酯甲基,其为肌醇-1-磷酸酯的类似物。将二异丙基膦酸酯的二异丙酯选择性地脱保护,并使用二环己基碳二亚胺将相应的阴离子与1,2-二棕榈酰-sn-甘油偶联。脱保护得到了磷脂酰肌醇的甲基β-d-半乳糖苷衍生的类似物。半乳糖衍生的磷脂酰肌醇和肌醇-1-磷酸酯的类似物不是分枝杆菌无细胞分枝杆菌中参与磷脂酰肌醇甘露糖苷生物合成的分枝杆菌甘露糖基转移酶(浓度高达1 mM)的底物。已显示半乳糖衍生的磷脂酰肌醇的膦酸酯类似物是0.01 mM的PimA甘露糖基转移酶的抑制剂,参与从磷脂酰肌醇合成磷脂酰肌醇甘露糖苷,并且是下一个甘露糖基转移酶的较弱的抑