A self-assembled relay probe for detecting a target material is provided including: a first peptide tag bound to the target material; and a first fluorescent conjugate including a first fluorochrome and a first tag binding group; wherein the first fluorescent conjugate selectively associates with the first tag. The probe further includes a second peptide tag bound to the target material; and a second fluorescent conjugate including a second fluorochrome having a longer wavelength and distinct excitation and emission maxima from the first fluorochrome and a second tag binding group. Upon exposure to the target material, the first and second fluorescent conjugates independently associate with the first and second peptide tags, respectively, so as to be a distance apart represented by about 0.1 times R
0
to about 2 times R
0
, such that upon excitation of the first fluorescent conjugate, fluorescence resonance energy transfer results in excitation of the second fluorescent conjugate, yielding detectable emission from the second fluorescent conjugate.
提供了一种用于检测目标物质的自组装继电探针,包括:与目标物质结合的第一肽标签;以及包括第一荧光
染料和第一标签结合基团的第一荧光共轭物;其中第一荧光共轭物选择性地与第一标签结合。探针还包括与目标物质结合的第二肽标签;以及包括具有比第一荧光
染料波长长且激发和发射极值不同的第二荧光
染料和第二标签结合基团的第二荧光共轭物。在暴露于目标物质时,第一和第二荧光共轭物分别与第一和第二肽标签独立结合,使得它们之间的距离大约为0.1倍R0到2倍R0,因此,在激发第一荧光共轭物时,荧光共振能量转移导致第二荧光共轭物被激发,从而产生第二荧光共轭物的可检测发射。