申请人:——
公开号:US20020137201A1
公开(公告)日:2002-09-26
Methods and compositions are provided for determining the potential of a membrane. In one aspect, the method comprises:
(a) introducing a first reagent comprising a hydrophobic fluorescent ion capable of redistributing from a first face of the membrane to a second face of the membrane in response to changes in the potential of the membrane, as described by the Nernst equation,
(b) introducing a second reagent which labels the first face or the second face of the membrane, which second reagent comprises a chromophore capable of undergoing energy transfer by either (i) donating excited state energy to the fluorescent ion, or (ii) accepting excited state energy from the fluorescent ion,
(c) exposing the membrane to radiation;
(d) measuring energy transfer between the fluorescent ion and the second reagent, and
(e) relating the energy transfer to the membrane potential.
Energy transfer is typically measured by fluorescence resonance energy transfer. In some embodiments the first and second reagents are bound together by a suitable linker.
In one aspect the method is used to identify compounds which modulate membrane potentials in biological membranes.
提供了一种测定膜电位潜力的方法和组合物。在一个方面,该方法包括:(a)引入第一试剂,该试剂包括一种疏水性荧光离子,能够根据Nernst方程式的描述从膜的第一面重新分布到膜的第二面,以响应膜电位的变化,(b)引入第二试剂,该试剂标记膜的第一面或第二面,该试剂包括一种染色体,能够通过(i)将激发态能量转移给荧光离子,或(ii)从荧光离子接受激发态能量,(c)将膜暴露于辐射下,(d)测量荧光离子和第二试剂之间的能量转移,(e)将能量转移与膜电位相关联。能量转移通常通过荧光共振能量转移来测量。在某些实施例中,第一和第二试剂由适当的连接剂结合在一起。在一个方面,该方法用于鉴定调节生物膜电位的化合物。