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• W2057671616 startingPage "5080" @default.
• W2057671616 abstract "Electrocatalytic oxidation of the oligonucleotide 5'- GAA GAG GTT TTT CCT CTT CTT TTT CTT CTC C (TS) by Ru(bpy)(3)(2+) was studied by cyclic voltammetry. This oligonucleotide forms either an intramolecular triplex, hairpin, or single strand, depending on the pH (Plum, G. E.; Breslauer, K. J. J. Mol. Biol. 1995, 248, 679-695). In the triplex form, the guanine doublet in TS is buried inside the folded structure, and as such is less susceptible to oxidation by electrogenerated Ru(bpy)(3)(3+). Digital simulations of the catalytic voltammograms gave a rate constant of 3.5 +/- 0.2 x 10(2) M(-1) s(-1) for oxidation of the triplex form, while oxidation of the duplex and single-stranded forms occurred with much faster rate constants of (3.5-9.1) x 10(4) M(-1) s(-1). Experiments using a truncated form of TS that lacked the third strand of the triplex were consistent with these measurements. The Ru(bpy)(3)(3+) complex was also generated by photolyzing Ru(bpy)(3)(2+) in the presence of Fe(CN)(6)(3-). This reaction produced strand scission following piperidine treatment, which was visualized using high-resolution gel electrophoresis. These experiments showed decreased reactivity for the triplex form, and also gave an unusual reversal of a common selectivity for the 5'-G of GG doublets generally seen in B-form DNA. This reversal was ascribed to strain caused by the location of the GG doublet adjacent to the hairpin loop." @default.
• W2057671616 created "2016-06-24" @default.
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• W2057671616 date "2004-07-13" @default.
• W2057671616 modified "2023-10-13" @default.
• W2057671616 title "Electrochemical Determination of Triple Helices: Electrocatalytic Oxidation of Guanine in an Intramolecular Triplex" @default.
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• W2057671616 doi "https://doi.org/10.1021/ic049895x" @default.
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