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• W2896588139 abstract "The tetracycline-binding RNA aptamer (TC-aptamer) is a synthetic riboswitch that binds the antibiotic tetracycline (TC) with exceptionally high affinity. Although a crystal structure exists of the TC-bound state, little is known about the conformational dynamics and changes upon ligand binding. In this study, pulsed electron paramagnetic resonance techniques for measuring distances (PELDOR) in combination with rigid nitroxide spin labels (Çm spin label) were used to investigate the conformational flexibility of the TC-aptamer in the presence and absence of TC at different Mg 2+ concentrations. TC was found to be the essential factor for stabilizing the tertiary structure at intermediate Mg 2+ concentrations. At higher Mg 2+ concentrations, Mg 2+ alone is sufficient to stabilize the tertiary structure. In addition, the orientation of the two spin-labeled RNA helices with respect to each other was analyzed with orientation-selective PELDOR and compared to the crystal structure. These results demonstrate for the first time the unique value of the Çm spin label in combination with PELDOR to provide information about conformational flexibilities and orientations of secondary structure elements of biologically relevant RNAs." @default.
• W2896588139 created "2018-10-26" @default.
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• W2896588139 date "2018-10-18" @default.
• W2896588139 modified "2023-10-14" @default.
• W2896588139 title "Influence of Mg²⁺ on the conformational flexibility of a tetracycline aptamer" @default.
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• W2896588139 doi "https://doi.org/10.1261/rna.068684.118" @default.
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• W2896588139 hasPublicationYear "2018" @default.
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