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通过对接分子动力学产生的非活性激酶构象发现酪氨酸激酶抑制剂。

Discovery of tyrosine kinase inhibitors by docking into an inactive kinase conformation generated by molecular dynamics.

机构信息

Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich (Switzerland).

出版信息

ChemMedChem. 2012 Nov;7(11):1983-90. doi: 10.1002/cmdc.201200331. Epub 2012 Sep 13.

Abstract

Several small molecules that bind to the inactive DFG-out conformation of tyrosine kinases (called type II inhibitors) have shown a good selectivity profile over other kinase targets. To obtain a set of DFG-out structures, we performed an explicit solvent molecular dynamics (MD) simulation of the complex of the catalytic domain of a tyrosine kinase receptor, ephrin type-A receptor 3 (EphA3), and a manually docked type II inhibitor. Automatic docking of four previously reported type II inhibitors was used to select a single snapshot from the MD trajectory for virtual screening. High-throughput docking of a pharmacophore-tailored library of 175,000 molecules resulted in about 4 million poses, which were further filtered by van der Waals efficiency and ranked according to a force-field-based energy function. Notably, around 20 % of the compounds with predicted binding energy smaller than -10 kcal mol(-1) are known type II inhibitors. Moreover, a series of 5-(piperazine-1-yl)isoquinoline derivatives was identified as a novel class of low-micromolar inhibitors of EphA3 and unphosphorylated Abelson tyrosine kinase (Abl1). The in silico predicted binding mode of the new inhibitors suggested a similar affinity to the gatekeeper mutant T315I of Abl1, which was verified in vitro by using a competition binding assay. Additional evidence for the type II binding mode was obtained by two 300 ns MD simulations of the complex between N-(3-chloro-4-(difluoromethoxy)phenyl)-2-(4-(8-nitroisoquinolin-5-yl)piperazin-1-yl)acetamide and EphA3.

摘要

几种与酪氨酸激酶的非活性 DFG-out 构象结合的小分子(称为 II 型抑制剂)在其他激酶靶标上表现出良好的选择性。为了获得一组 DFG-out 结构,我们对酪氨酸激酶受体 Ephrin type-A 受体 3(EphA3)的催化结构域与手动对接的 II 型抑制剂的复合物进行了显式溶剂分子动力学(MD)模拟。自动对接了之前报道的四种 II 型抑制剂,从 MD 轨迹中选择一个快照进行虚拟筛选。基于药效团的 175000 个分子库的高通量对接产生了大约 400 万个构象,这些构象进一步通过范德华效率过滤,并根据基于力场的能量函数进行排序。值得注意的是,预测结合能小于-10 kcal/mol 的化合物中约有 20%是已知的 II 型抑制剂。此外,还鉴定了一系列 5-(哌嗪-1-基)异喹啉衍生物,它们是 EphA3 和未磷酸化的 Abelson 酪氨酸激酶(Abl1)的新型低微摩尔抑制剂。新抑制剂的预测结合模式表明与 Abl1 的门控突变体 T315I 具有相似的亲和力,这在使用竞争结合测定法的体外得到了验证。通过对 N-(3-氯-4-(二氟甲氧基)苯基)-2-(4-(8-硝基异喹啉-5-基)哌嗪-1-基)乙酰胺与 EphA3 的复合物进行的两次 300 ns MD 模拟,获得了更多关于 II 型结合模式的证据。

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