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- W2007718305 abstract "The photochemistry of Pt2(pop)44- with nucleic acids has been studied using radiolabeled oligomers of DNA and RNA and high-resolution electrophoresis (pop is P2O5H22-). Photolysis of Pt2(pop)44- with duplex DNA produces an even cleavage ladder and relatively little enhancement of cleavage upon treatment with piperidine. In contrast, the cleavage pattern is far less regular with single-stranded DNA, and there is a large enhancement in cleavage upon treatment with piperidine. Accordingly, photolysis of Pt2(pop)44- with the DNA hairpin 5‘-d[ATCCTATTTATAGGAT] produces a much larger piperidine enhancement at the loop and end nucleotides than in the stem. There is an additional piperidine enhancement that occurs selectively at guanine residues either in RNA or in DNA at low Mg2+ concentrations that is attributed to outer-sphere electron transfer on the basis of the known excited-state redox potentials of Pt2(pop)44-* and the expected oxidative chemistry of guanine. The extent of guanine oxidation is higher compared to the extent of sugar oxidation at low Mg2+ concentrations, which can be attributed to a shallower distance dependence for electron transfer compared to that for atom transfer. The effects of Mg2+ and piperidine or aniline treatment were examined on stem−loop structures of DNA and RNA and gave partial images of the expected secondary structures." @default.
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- W2007718305 date "1998-09-01" @default.
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- W2007718305 title "Effects of Secondary Structure on DNA and RNA Cleavage by Diplatinum(II)" @default.
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- W2007718305 doi "https://doi.org/10.1021/bi981479z" @default.
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