Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 114, Issue 46, Pages 15106-15112Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1022373
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Funding
- Natural Sciences and Engineering Research Council of Canada
- National Research Council
- MDS SCIEX
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Electrospray ionization tandem mass spectrometry (ESI-MS/MS) was employed in a detailed study of the interactions of mercury dications with selected oligodeoxynucleotides rich and poor in thymine (T): d(5'-TT-3'), d(5'-TTT-3'), d(5'-TTTT-3'), d(5'-GG-3'), d(5'-CC-3'), d(5'-AA-3'), d(5'-GCTTGC-3'), d(5'-GTGCTC-3'), d(5'-GCATGC-3'), and d(5'-GCGCGC-3'). Specific interactions are observed for Hg2+ with pure and mixed thymine sequences in which simultaneous bonding between two thymine units is indicated, and this is consistent with a model proposed in the literature in which Hg2+ covalently coordinates to two thymines by replacing two N3 imino protons of the bases. The ESI-MS/MS measurements, combined with data on the thermal stability of mixed sequence hexadeoxynucleotides, indicate that mercury prefers thymines over the other binding sites in oligonucleotides both in solution and in the gas phase. These results point toward the effective use of Hg2+ in the fast detection of mismatch base pairs incorporated in oligonucleotide duplexes and longer mixed DNA sequences using ESI-MS/MS.
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