Probing mercury(II)-DNA interactions by nanopore stochastic sensing.

Probing mercury(II)-DNA interactions by nanopore stochastic sensing.
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DOI:
10.1021/jp309541h
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发表时间:
2013-05-02
影响因子:
3.3
通讯作者:
Guan, Xiyun
Guan, Xiyun
中科院分区:
化学3区
文献类型:
--
作者:
Wang, Guihua;Zhao, Qitao;Kang, Xiaofeng;Guan, Xiyun

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在这项工作中,DNA-Hg(II)的相互作用进行了研究,通过监测在蛋白质离子通道中的金属离子的存在和不存在的DNA发夹易位。我们的实验表明,目标特异性发夹结构可以更显着地稳定汞离子比茎的长度和环的大小的发夹,由于形成的胸腺嘧啶-汞(II)-胸腺嘧啶复合物。此外,设计的DNA探针允许开发一种高灵敏度的纳米孔传感器,用于Hg2+,检测限为25 nM。此外,该传感器是特异性的,并且浓度比Hg 2+高两个数量级的其它被测金属离子(包括Pb 2+、Cu 2+、Cd 2+等)不会干扰汞检测。
In this work, DNA-Hg(II) interactions were investigated by monitoring the translocation of DNA hairpins in a protein ion channel in the absence and presence of metal ions. Our experiments demonstrate that target-specific hairpin structures could be stabilized much more significantly by mercuric ions than by the stem length and the loop size of the hairpin due to the formation of Thymine-Hg(II)-Thymine complexes. In addition, the designed DNA probe allows the development of a highly sensitive nanopore sensor for Hg2+ with a detection limit of 25 nM. Further, the sensor is specific, and other tested metal ions including Pb2+, Cu2+, Cd2+, etc. with concentrations of up to two orders of magnitude greater than that of Hg2+ would not interfere with the mercury detection.
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