Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich (Switzerland).
ChemMedChem. 2012 Nov;7(11):1983-90. doi: 10.1002/cmdc.201200331. Epub 2012 Sep 13.
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.
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。