Turning an aptamer into a light-switch probe with a single bioconjugation.

Turning an aptamer into a light-switch probe with a single bioconjugation.
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DOI:
10.1021/bc5003899
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发表时间:
2015-01-21
影响因子:
4.7
通讯作者:
Pierre, Valerie C.
Pierre, Valerie C.
中科院分区:
化学2区
文献类型:
--
作者:
Wickramaratne, Thalcshila M.;Pierre, Valerie C.

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我们描述了一种通过单一缀合将结构转换适体转化为发光光开关探针的方法。使用已知的Hg 2+适体作为案例研究证明了该方法。这种方法利用镧系元素为基础的金属嵌入剂,Eu-DOTA-Phen,其发光几乎完全和选择性地被嘌呤淬灭,但根本不被嘧啶淬灭。因此,这种复合物在插入dsDNA中时不发光,但当与由几个嘧啶终止的ssDNA缀合时,它是亮红色的。在其设计中,光开关探针掺入与其互补链部分杂交的结构转换适体。镧系元素络合物通过稳定的酰胺键与任一链缀合。分析物与结构转换适体的结合释放互补链。这种释放排除了嵌入剂在dsDNA中的嵌入,这打开了它的发光。所得探针在结合其分析物后开启21倍。此外,结构转换适体是高度选择性的,并且探针的长发光寿命容易实现用于去除样品的背景自发荧光的时间门控实验。
We describe a method for transforming a structure-switching aptamer into a luminescent light-switch probe via a single conjugation. The methodology is demonstrated using a known aptamer for Hg2+ as a case study. This approach utilizes a lanthanide-based metallointercalator, Eu-DOTA-Phen, whose luminescence is quenched almost entirely and selectively by purines, but not at all by pyrimidines. This complex, therefore, does not luminesce while intercalated in dsDNA, but it is bright red when conjugated to a ssDNA that is terminated by several pyrimidines. In its design, the light-switch probe incorporates a structure-switching aptamer partially hybridized to its complementary strand. The lanthanide complex is conjugated to either strand via a stable amide bond. Binding of the analyte by the structure-switching aptamer releases the complementary strand. This release precludes intercalation of the intercalator in dsDNA, which switches on its luminescence. The resulting probe turns on 21-fold upon binding to its analyte. Moreover, the structure switching aptamer is highly selective, and the long luminescence lifetime of the probe readily enables time-gating experiments for removal of the background autofluorescence of the sample.
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