AbstractTwo-pore domain potassium (K2P) channels generate leak currents that are responsible for the maintenance of the resting membrane potential, and they are thus potential drug targets for treating diseases. Here, we identify N-(4-cholorphenyl)-N-(2-(3,4-dihydrosioquinolin-2(1H)-yl)-2-oxoethyl)methanesulfonamide (TKDC) as an inhibitor of the TREK subfamily, including TREK-1, TREK-2 and TRAAK channels. Using TKDC as a chemical probe, a study combining computations, mutagenesis and electrophysiology reveals a K2P allosteric ligand-binding site located in the extracellular cap of the channels. Molecular dynamics simulations suggest that ligand-induced allosteric conformational transitions lead to blockage of the ion conductive pathway. Using virtual screening approach, we identify other inhibitors targeting the extracellular allosteric ligand-binding site of these channels. Overall, our results suggest that the allosteric site at the extracellular cap of the K2P channels might be a promising drug target for these membrane proteins.
标题:摘要
两孔道钾(K2P)通道产生泄漏电流,负责维持静息膜电位,因此它们是治疗疾病的潜在药物靶点。在这里,我们确定N-(4-氯苯基)-N-(2-(3,4-二氢喹啉-2(1H)-基)-2-氧乙基)甲磺酰胺(TKDC)作为TREK亚家族(包括TREK-1、TREK-2和TRAAK通道)的抑制剂。使用TKDC作为化学探针,结合计算、突变和电生理研究揭示了位于通道外侧帽上的K2P异构配体结合位点。分子动力学模拟表明,配体诱导的异构构象转变导致离子传导通道的阻塞。使用虚拟筛选方法,我们确定了针对这些通道外侧异构配体结合位点的其他抑制剂。总的来说,我们的结果表明,K2P通道外侧帽上的异构位点可能是这些膜蛋白的一个有前途的药物靶点。