Methods and compositions are provided for detecting changes in membrane potential in membranes biological systems. In one aspect, the method comprises;
a) providing a living cell with a first reagent comprising a charged hydrophobic molecule which is typically a fluorescence resonance energy transfer (FRET) acceptor or donor, or is a quencher and is capable of redistributing within the membrane of a biological membrane in response to changes in the potential across the membrane;
b) providing the cell with a second reagent that can label the first face or the second face of a biological membrane within the cell;
c) detecting light emission from the first reagent or the second reagent.
One aspect of this method involves monitoring membrane potential changes in subcellular organelle membranes in a living cells.
Another aspect of the invention is the use of certain embodiments of the method for the screening of test chemicals for activity to modulate the activity of a target ion channel.
Another aspect of the present invention is a transgenic organism comprising a first reagent that comprises a charged hydrophobic fluorescent molecule, and a second reagent comprising a bioluminescent or naturally fluorescent protein.
提供了用于检测
生物系统膜电位变化的方法和组合物。在其中一种方面,该方法包括:a)向具有带电疏
水分子的第一试剂的活细胞提供,该带电疏
水分子通常是荧光共振能量转移(FRET)受体或给体,或是淬灭剂,并能够在
生物膜跨膜电位变化时在膜内重新分布;b)向细胞提供第二试剂,该试剂可以标记细胞内
生物膜的第一面或第二面;c)检测第一试剂或第二试剂的光发射。该方法的一种方面涉及在活细胞的亚细胞器膜中监测膜电位变化。该发明的另一方面是使用该方法的某些实施方式来筛选测试
化学物质的活性,以调节靶离子通道的活性。本发明的另一方面是包括第一试剂,该试剂包括带电疏
水荧光分子的转
基因生物,以及包括
生物发光蛋白或天然荧光蛋白的第二试剂。