Playing with Opening and Closing of Heterocycles: Using the Cusmano-Ruccia Reaction to Develop a Novel Class of Oxadiazolothiazinones, Active as Calcium Channel Modulators and P-Glycoprotein Inhibitors
作者:Domenico Spinelli、Roberta Budriesi、Barbara Cosimelli、Elda Severi、Matteo Micucci、Massimo Baroni、Fabio Fusi、Pierfranco Ioan、Simon Cross、Maria Frosini、Simona Saponara、Rosanna Matucci、Camillo Rosano、Maurizio Viale、Alberto Chiarini、Emanuele Carosati
DOI:10.3390/molecules191016543
日期:——
As a result of the ring-into-ring conversion of nitrosoimidazole derivatives, we obtained a molecular scaffold that, when properly decorated, is able to decrease inotropy by blocking L-type calcium channels. Previously, we used this scaffold to develop a quantitative structure-activity relationship (QSAR) model, and we used the most potent oxadiazolothiazinone as a template for ligand-based virtual screening. Here, we enlarge the diversity of chemical decorations, present the synthesis and in vitro data for 11 new derivatives, and develop a new 3D-QSAR model with recent in silico techniques. We observed a key role played by the oxadiazolone moiety: given the presence of positively charged calcium ions in the transmembrane channel protein, we hypothesize the formation of a ternary complex between the oxadiazolothiazinone, the Ca2+ ion and the protein. We have supported this hypothesis by means of pharmacophore generation and through the docking of the pharmacophore into a homology model of the protein. We also studied with docking experiments the interaction with a homology model of P-glycoprotein, which is inhibited by this series of molecules, and provided further evidence toward the relevance of this scaffold in biological interactions.
由于硝基咪唑衍生物的环到环转变,我们获得了一个分子骨架,适当修饰后能够通过阻断L型钙通道来降低心肌收缩力。先前,我们利用这个骨架开发了一个定量构效关系(QSAR)模型,并使用其中效力最强的二唑硫嗪酮作为基于配体的虚拟筛选模板。在此,我们扩展了化学修饰的多样性,提供了11种新衍生物的合成和体外数据,并且利用最新的计算机技术开发了一个新的三维QSAR模型。我们观察到了二唑酮部分的关键作用:鉴于跨膜通道蛋白中存在带正电的钙离子,我们假设二唑硫嗪酮、钙离子和蛋白质之间形成了三元复合物。通过生成药效团并将其对接进蛋白质的同源模型中,我们支持了这一假设。我们还利用对接实验研究了与P-糖蛋白同源模型的相互作用,这一系列的分子能够抑制P-糖蛋白,并为这个骨架在生物相互作用中的相关性提供了更多证据。