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
中科院分区:
文献类型:
--
作者:
Wang, Guihua;Zhao, Qitao;Kang, Xiaofeng;Guan, Xiyun
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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