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    • 1. 发明授权
    • Detection of analytes using fluorescent energy transfer
    • 使用荧光能量转移检测分析物
    • US5439797A
    • 1995-08-08
    • US114103
    • 1993-08-30
    • Roger Y. TsienSusan S. TaylorStephen R. AdamsYing Ji
    • Roger Y. TsienSusan S. TaylorStephen R. AdamsYing Ji
    • C12N9/00C12Q1/48G01N21/64G01N33/542G01N33/58G01N33/68G01N33/533
    • G01N33/542G01N33/582Y10S436/80
    • The invention provides labeled proteins suitable for determining the presence of cAMP, other second messengers and organic molecules. The proteins are separately labeled with fluorochromes which, when in close spatial proximity, preferably, less than about 6 nm, interact through the transfer of energy from one fluorochrome to the other.A composition of matter, (S.sub.1.A).sub.n1 (S.sub.2.D).sub.n2 is provided wherein S.sub.1 and S.sub.2 are two proteins which are associated in one state and substantially disassociated in another, the equilibrium between which is controlled by the free concentration of an analyte, and A and D are fluorochromes, the emission wavelength of fluorochrome D overlapping the excitation wavelength of fluorochrome A and the distance between A and D being in sufficiently close proximity to allow the radiationless transfer of energy between the fluorochromes. A and D can be selected from a variety of acceptor, donor pairs such as fluorescein and tetramethylrhodamine and derivatives thereof. The concentration of analytes such as cAMP in a sample can be determined by contacting the sample with (S.sub.1.A).sub.n1 (S.sub.2.D).sub.n2 providing energy near the excitation wavelength of D and measuring the fluorescence of A or D, the concentration of cAMP and other said analytes being determined by the ratio of emission of D to the emission of A, previously calibrated with reference solutions of known analyte concentration.
    • 本发明提供了适合于测定cAMP,其他第二信使和有机分子的存在的标记蛋白质。 蛋白质分别用荧光染料标记,当空间接近时,优选小于约6nm,通过将能量从一个荧光染料转移到另一个荧光染料相互作用。 提供了一种物质组合物(S1.A)n1(S2.D)n2,其中S1和S2是两种蛋白质,两种蛋白质在一种状态下相互关联,并且在另一种状态下基本上脱离,其中的平衡受自由浓度 分析物,A和D是荧光染料,荧光染料D的发射波长与荧光染料A的激发波长重叠,A和D之间的距离足够接近,从而允许在荧光染料之间无辐射传递能量。 A和D可以选自多种受体,诸如荧光素和四甲基罗丹明的供体对及其衍生物。 通过使样品与(S1.A)n1(S2.D)n2接触,在D的激发波长附近提供能量并测量A或D的荧光,可以测定样品中cAMP等分析物的浓度, cAMP和其他所述分析物由D的排放与A的排放比例决定,其先前用已知分析物浓度的参考溶液校准。