In order to contribute to a rational design of optimised protease inhibitors which can covalently block the nucleophilic amino acids of the proteases' active sites, we have chosen three model compounds (aziridine l, oxirane 2 and acceptor-substituted olefin 3) for the examination of their electron-density distribution. Therefore, high-resolution low temperature (9, 27 and 100 K) X-ray diffraction experiments on single-crystals were carried out with synchrotron and conventional X-radiation. It could be shown by the analysis of the electron density using mainly Bader's Theory of Atoms in Molecules, Volkov's EPMM method for interaction energies, electrostatic potentials and Gatti's Source Function that aziridine l is most suitable for drug design in this field. A regioselective nucleophilic attack at carbon atom C1 could be predicted and even hints about the reaction's stereoselectivity could be obtained. Moreover, the comparison between two data sets of aziridine l (conventional X-ray source vs. synchrotron radiation) gave an estimate concerning the reproducibility of the quantitative results.
为了优化蛋白酶抑制剂的设计,使其能够共价阻断
蛋白酶活性位点的亲核
氨基酸,我们选择了三种模型化合物(
氮丙啶l、
环氧乙烷2和受体取代烯烃3)来研究它们的电子密度分布。因此,我们利用同步辐射和常规X射线对单晶进行了高分辨率低温(9、27和100 K)X射线衍射实验。通过主要使用巴德分子中原子理论、沃尔科夫EPMM相互作用能方法、静电势和加蒂源函数对电子密度进行分析,可以发现
氮丙啶l最适合该领域的药物设计。可以预测出碳原子C1上的区域选择性亲核攻击,甚至可以得到反应立体选择性的提示。此外,通过比较
氮丙啶l的两个数据集(常规X射线源与同步辐射),可以估算定量结果的重复性。