期刊
NEW JOURNAL OF CHEMISTRY
卷 39, 期 11, 页码 8752-8762出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nj01859e
关键词
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资金
- National Natural Science Foundation of China [21072229]
- Beijing Natural Science Foundation [7123223]
The stable T-Hg-T base pair in nucleic acids has been widely applied for Hg2+ biosensors. Based on the N-Hg binding mechanism for a mercury ion to nucleobases, the N-Hg-N bond was studied in other base pairs (T-T, T-G, G-G, C+-C+) with two imino groups within the base pairing face, in the context of parallel DNA duplexes. In the six C+-C+ pairs - defined parallel DNA duplexes at pH 5.0, the parallel T-Hg-T was suggested to be a very weak base pair, as it was not stable enough to support a long T-Hg-T stem, unlike the anti-parallel T-Hg-T base pair. No interactions between Hg2+ and the parallel T-G, G-G, and C+-C+ pairs were observed. In the anti-parallel dsDNA, the stabilizing effect of T-Hg-T was significant, but with position and sequence dependence, it was mostly less stable than the natural A-T base pair. An anti-parallel T-Hg-T stem is preferred over a parallel stem in the functional nucleic acids for the design of Hg2+ biosensors. It seems that the N-Hg-N bond is only accommodated in the T-T pair within the DNA duplex, different from the free bonding mode between individual nucleobases, nucleosides, or nucleotides. These results are helpful for the design of the T-Hg-T stem in Hg2+ biosensors based on functional nucleic acids.
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