The stereoselective synthesis of aziridine analogues of diaminopimelic acid (DAP) and their interaction with dap epimerase
作者:Christopher M. Diaper、Andrew Sutherland、Bindu Pillai、Michael N. G. James、Paul Semchuk、John S. Blanchard、John C. Vederas
DOI:10.1039/b513409a
日期:——
Aziridine analogues of diaminopimelic acid (DAP) have been prepared stereoselectively for the first time and evaluated as inhibitors of DAP epimerase. (2R,3S,3′S)-3-(3′-Aminopropane)aziridine-2,3′-dicarboxylate 4 was synthesised and shown to be a reversible inhibitor of DAP epimerase with an IC50 value of 2.88 mM. (2S,4S)- and (2S,4R)-2-(4-Amino-4-carboxybutyl)aziridine-2-carboxylic acid (LL-azi-DAP 14 and DL-azi-DAP 29) were made as pure diastereomers, and both were shown to be irreversible inhibitors of DAP epimerase. LL-Azi-DAP 14 selectively binds to Cys-73 of the enzyme active site whereas DL-azi-DAP 29 binds to Cys-217 via attack of sulfhydryl on the methylene of the inhibitor aziridine ring. These observations are consistent with the two base mechanism proposed for the epimerisation of LL-DAP 1 and meso-DAP 2 by DAP epimerase.
我们首次立体选择性地制备了二氨基亚庚酸(DAP)的氮丙啶类似物,并将其评估为 DAP 外切酶的抑制剂。合成了(2R,3S,3′S)-3-(3′-氨基丙烷)氮丙啶-2,3′-二甲酸酯 4,结果表明它是 DAP 表聚酶的可逆抑制剂,IC50 值为 2.88 mM。(2S,4S)-和(2S,4R)-2-(4-氨基-4-羧基丁基)氮丙啶-2-羧酸(LL-Azi-DAP 14 和 DL-azi-DAP 29)被制成纯非对映异构体,并被证明都是 DAP 表聚酶的不可逆抑制剂。LL-azi-DAP 14 可选择性地与酶活性位点的 Cys-73 结合,而 DL-azi-DAP 29 则通过巯基对抑制剂氮丙啶环亚甲基的攻击与 Cys-217 结合。这些观察结果与 DAP 表聚酶对 LL-DAP 1 和 meso-DAP 2 的表聚作用提出的双基机制是一致的。