The present invention provides compositions and methods useful for assaying binding of compounds to the hERG K
+
channel. According to a method of the present invention, a compound of interest is added to the hERG K
+
channel in the presence of a selenium analog of a competitive inhibitor of the hERG K
+
channel. Next, the amount of the selenium analog of the competitive inhibitor that bound to the hERG K
+
channel is quantified using mass spectrometry. The quantified amount can then be used to determine the amount of the compound of interest that bound to the hERG K
+
channel. A selenium analog of any competitive inhibitor of the hERG K
+
channel may be used according to the present invention, including but not limited to selenium analogs of the small molecule dofetilide; the peptide BeKm-1; or a combination of both.
本发明提供了用于检测化合物与hERG K+通道结合的组合物和方法。根据本发明的一种方法,在hERG K+通道存在竞争性
抑制剂的
硒类似物的情况下,将感兴趣的化合物添加到hERG K+通道中。接下来,使用质谱法定量测定与hERG K+通道结合的
硒类似物的数量。然后,可以使用定量的数量来确定与hERG K+通道结合的感兴趣的化合物的数量。根据本发明可以使用任何hERG K+通道的竞争性
抑制剂的
硒类似物,包括但不限于小分子dofetilide的
硒类似物,肽BeKm-1的
硒类似物或两者的组合。