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• W2076696811 abstract "Abstract Understanding the process by which RNA molecules fold into stable structures includes study of the role of site‐bound metal ions. Because the alkaline earth metal ions typically associated with RNA structure [most often Mg(II)] do not provide convenient spectroscopic signals, replacement with metal ions having spectroscopically useful properties has been a valuable approach. The luminescence properties of the lanthanide(III) series, in particular europium(III), have made them useful in the study of complexation with biomolecules. We review the physical, chemical, and spectroscopic characteristics of Eu(III) that contribute to its value as a probe of RNA–metal ion interactions, and examples of information obtained from studies of Eu(III) bound to small RNA stem loops. Although Eu(III) has similar site preference to Mg(II), luminescence and isothermal titration calorimetry measurements indicate that Ln(III) loses water molecules from the inner hydration sphere more readily than does Mg(II), resulting in more direct coordination between RNA and the metal ion and very different energetics of binding. In some cases, e.g., a GAAA tetraloop, binding appears to occur by a lock and key process; in the same base sequence containing certain deoxynucleoside substitutions that alter loop structure, binding appears to occur by an induced fit process. © 2003 Wiley Periodicals, Inc. Biopolymers 69:100–109, 2003" @default.
• W2076696811 created "2016-06-24" @default.
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• W2076696811 date "2003-04-18" @default.
• W2076696811 modified "2023-10-17" @default.
• W2076696811 title "Binding of Europium(III) ions to RNA stem loops: Role of the primary hydration sphere in complex formation" @default.
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• W2076696811 doi "https://doi.org/10.1002/bip.10320" @default.
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