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- W2800693996 abstract "The structure of ribonucleic acid (RNA) polymers is strongly dependent on the presence of, in particular Mg2+ cations to stabilize structural features. Only in high-resolution X-ray crystallography structures can ions be identified reliably. Here, we perform molecular dynamics simulations of 24 RNA structures with varying ion concentrations. Twelve of the structures were helical and the others complex folded. The aim of the study is to predict ion positions but also to evaluate the impact of different types of ions (Na+ or Mg2+) and the ionic strength on structural stability and variations of RNA. As a general conclusion Mg2+ is found to conserve the experimental structure better than Na+ and, where experimental ion positions are available, they can be reproduced with reasonable accuracy. If a large surplus of ions is present the added electrostatic screening makes prediction of binding-sites less reproducible. Distinct differences in ion-binding between helical and complex folded structures are found. The strength of binding (ΔG‡ for breaking RNA atom-ion interactions) is found to differ between roughly 10 and 26 kJ/mol for the different RNA atoms. Differences in stability between helical and complex folded structures and of the influence of metal ions on either are discussed." @default.
- W2800693996 created "2018-05-17" @default.
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- W2800693996 date "2018-04-30" @default.
- W2800693996 modified "2023-10-10" @default.
- W2800693996 title "Influence of Na+ and Mg2+ ions on RNA structures studied with molecular dynamics simulations" @default.
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- W2800693996 doi "https://doi.org/10.1093/nar/gky221" @default.
- W2800693996 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6007214" @default.