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• W2051229583 abstract "The dissociation and assembly of quadruplex DNA structures (and a few quadruplex RNAs) have been characterized at several levels of rigor, ranging from gross descriptions of factors that govern each process, to semiquantitative comparisons of the relative abilities of these factors to induce stabilization or destabilization, to quantitative studies of binding energies (thermodynamics), transformational rates (kinetics), and analysis of their transition-state energies and mechanisms. This survey classifies these factors, describes the trends and focuses on their interdependencies. Quadruplex assembly is induced most efficiently by added K(+) and elevating the strand concentration; however, Na(+), NH(4)(+), Sr(2+), and Pb(2+) are also very effective stabilizers. Quadruplex dissociation is typically accomplished by thermal denaturation, melting; however, when the quadruplex and monovalent cation concentrations are low enough, or the temperature is sufficiently high, several divalent cations, e.g., Ca(2+), Co(2+), Mn(2+), Zn(2+), Ni(2+) and Mg(2+) can induce dissociation. Stabilization also depends on the type of structure adopted by the strand (or strands) in question. Variants include intramolecular, two- and four-stranded quadruplexes. Other important variables include strand sequence, the size of intervening loops and pH, especially when cytosines are present, base methylation, and the replacement of backbone phosphates with phosphorothioates. Competitive equilibria can also modulate the formation of quadruplex DNAs. For example, reactions leading to Watson-Crick (WC) duplex and hairpin DNAs, triplex DNAs, and even other types of quadruplexes can compete with quadruplex association reactions for strands. Others include nonprotein catalysts, small molecules such as aromatic dyes, metalloporphyrins, and carbohydrates (osmolytes). Other nucleic acid strands have been found to drive quadruplex formation. To help reinforce the implications of each piece of information, each functional conclusion drawn from each cited piece of thermodynamic or kinetic data has been summarized briefly in a standardized table entry." @default.
• W2051229583 created "2016-06-24" @default.
• W2051229583 creator A5019878156 @default.
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• W2051229583 creator A5078396248 @default.
• W2051229583 date "2000-01-01" @default.
• W2051229583 modified "2023-10-17" @default.
• W2051229583 title "Thermodynamic and kinetic characterization of the dissociation and assembly of quadruplex nucleic acids" @default.
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• W2051229583 doi "https://doi.org/10.1002/1097-0282(2000/2001)56:3<147::aid-bip10011>3.0.co;2-n" @default.
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