Development of a New Class of Inhibitors for the Malarial Aspartic Protease Plasmepsin II Based on a Central 7-Azabicyclo[2.2.1]heptane Scaffold
作者:David A. Carcache、Simone R. Hörtner、Paul Seiler、François Diederich、Arnulf Dorn、Hans Peter Märki、Christoph Binkert、Daniel Bur
DOI:10.1002/hlca.200390176
日期:2003.6
designed inhibitors feature a rigid 7-azabicyclo[2.2.1]heptane scaffold, which, in its protonated form, is assumed to undergo ionic H-bonding with the two catalytic Asp residues at the active site of PMII. Two substituents depart from the scaffold for occupancy of either the S1/S3 or S2′-pocket and the hydrophobic flap pocket, newly created by the conformational changes in PMII. The inhibitors synthesized
纤溶酶II(PMII)是一种疟疾天冬氨酸蛋白酶,参与疟原虫属寄生虫中血红蛋白的分解代谢,而人天冬氨酸蛋白酶肾素在其成熟链中具有35%的序列同一性。罗氏最近报道了与人肾素复合的4-芳基哌啶抑制剂的结构。与肾素的结构相比,用拟肽抑制剂鉴定出主要的构象变化,并随后在PMII的结构中进行建模(图1)。根据基于结构的从头设计方法,这种扭曲的PMII结构充当了新型PMII抑制剂的活性位点模型(图2)。)。这些新设计的抑制剂具有刚性的7-氮杂双环[2.2.1]庚烷骨架,该骨架以质子化形式被认为与PMII活性位点的两个催化Asp残基发生离子H键合。出于S1 / S3或S2'-口袋和疏水性襟翼口袋的占用,两个取代基从支架上离开,这是由PMII的构象变化新产生的。抑制剂合成的从开始Ñ -Boc保护的7-氮杂双环[2.2.1]庚-2-烯(6 ;方案1 - 5)显示到单个数字微摩尔活性(IC 50个值)朝向PMI