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• W2035394549 endingPage "14518" @default.
• W2035394549 startingPage "14506" @default.
• W2035394549 abstract "Condensation of monovalent counterions around DNA influences polymer properties of the DNA chain. For example, the Na+ ions show markedly stronger propensity to induce multiple DNA chains to assemble into compact structures compared with the K+ ions. To investigate the similarities and differences in the sodium and potassium ion condensation around DNA, we carried out a number of extensive all-atom molecular dynamics simulations of a DNA oligomer consisting of 16 base pairs, [d(CGAGGTTTAAACCTCG)]2, in explicit water. We found that the Na+ ions penetrate the DNA interior and condense around the DNA exterior to a significantly larger degree compared with the K+ ions. We have provided a microscopic explanation for the larger Na+ affinity toward DNA that is based on a combination of steric, electrostatic, and hydration effects. Unexpectedly, we found that the Cl- co-ions provide more efficient electrostatic screening for the K+ ions than for the Na+ ions, contributing to the larger Na+ condensation around DNA. To examine the importance of the discrete nature of water and ions, we also computed the counterion distributions from the mean-field electrostatic theory, demonstrating significant disagreements with the all-atom simulations. Prior experimental results on the relative extent of the Na+ and K+ condensation around DNA were somewhat contradictory. Recent DNA compaction experiments may be interpreted to suggest stronger Na+ condensation around DNA compared to K+, which is consistent with our simulations. We also provide a simple interpretation for the experimentally observed increase in DNA electrophoretic mobility in the alkali metal series, Li+ < Na+ < K+ < Rb+. We compare the DNA segment conformational preferences in various buffers with the proposed NMR models." @default.
• W2035394549 created "2016-06-24" @default.
• W2035394549 creator A5004113242 @default.
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• W2035394549 date "2006-10-19" @default.
• W2035394549 modified "2023-10-11" @default.
• W2035394549 title "Electrostatic, Steric, and Hydration Interactions Favor Na⁺ Condensation around DNA Compared with K⁺" @default.
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• W2035394549 doi "https://doi.org/10.1021/ja0629460" @default.
• W2035394549 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17090034" @default.
• W2035394549 hasPublicationYear "2006" @default.
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