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• W2034691129 endingPage "71" @default.
• W2034691129 startingPage "65" @default.
• W2034691129 abstract "While the antitumor activity of P(4+) is relatively well understood, the binding mechanism and thermodynamics for formation of (P(4+)·DNA) complexes remain in question. The thermodynamic parameters (Ka, ΔG, ΔH, and -TΔS) for formation of DNA complexes of the ruthenium dimer, [(phen)2Ru(tatpp)Ru(phen)2](4+) (abbreviated as P(4+)), where phen is 1,10-phenanthroline and tatpp is 9,11,20,22-tetraazatetrapyrido[3,2-a:2',3'-c:3″,2″-1:2‴,3‴-n]-pentacene, were determined using isothermal titration calorimetry. Calorimetric and spectroscopic titration experiments were performed in which P(4+) was added to three duplex DNAs of different lengths. We determined that P(4+) binds to duplex DNA at 298 K with modest affinity (Ka ≈ 3.8 × 10(5) M(-1), ΔG ≈ -7.6 kcal/mol), that the enthalpy change is unfavorable (ΔH ≈ +2.1 kcal/mol), and that complex formation is driven by a large favorable change in entropy (-TΔS ≈ -9.7 kcal/mol). These thermodynamic values were found to be approximately independent of the length of the DNA, and the stoichiometry of the (P(4+)·DNA) complexes was determined to be 1 P(4+)/2 DNA bp, at least for the two shorter DNAs. On the basis of the thermodynamic parameters, and the binding stoichiometry (verified in ESI-MS experiments), we conclude that P(4+) is intercalating between two adjacent DNA base pairs and that the neighbor sites on either side of the bound ligand are excluded from binding additional P(4+)." @default.
• W2034691129 created "2016-06-24" @default.
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• W2034691129 date "2014-12-16" @default.
• W2034691129 modified "2023-09-23" @default.
• W2034691129 title "Thermodynamic Investigations of [(phen)₂Ru(tatpp)Ru(phen)₂]⁴⁺ Interactions with B-DNA" @default.
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• W2034691129 doi "https://doi.org/10.1021/jp509569s" @default.
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