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• W2036027815 abstract "Acrylamide quenching is widely used to monitor the solvent exposure of fluorescent probes in vitro. Here, we tested the utility of this technique to discriminate local RNA secondary structures using the fluorescent adenine analogue 2-aminopurine (2-AP). Under native conditions, the solvent accessibilities of most 2-AP-labeled RNA substrates were poorly resolved by classical single-population models; rather, a two-state quencher accessibility algorithm was required to model acrylamide-dependent changes in 2-AP fluorescence in structured RNA contexts. Comparing 2-AP quenching parameters between structured and unstructured RNA substrates permitted the effects of local RNA structure on 2-AP solvent exposure to be distinguished from nearest neighbor effects or environmental influences on intrinsic 2-AP photophysics. Using this strategy, the fractional accessibility of 2-AP for acrylamide ( f a) was found to be highly sensitive to local RNA structure. Base-paired 2-AP exhibited relatively poor accessibility, consistent with extensive shielding by adjacent bases. 2-AP in a single-base bulge was uniformly accessible to solvent, whereas the fractional accessibility of 2-AP in a hexanucleotide loop was indistinguishable from that of an unstructured RNA. However, these studies also provided evidence that the f a parameter reflects local conformational dynamics in base-paired RNA. Enhanced base pair dynamics at elevated temperatures were accompanied by increased f a values, while restricting local RNA breathing by adding a C-G base pair clamp or positioning 2-AP within extended RNA duplexes significantly decreased this parameter. Together, these studies show that 2-AP quenching studies can reveal local RNA structural and dynamic features beyond those that can be measured by conventional spectroscopic approaches." @default.
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• W2036027815 date "2008-06-11" @default.
• W2036027815 modified "2023-09-30" @default.
• W2036027815 title "Local RNA Conformational Dynamics Revealed by 2-Aminopurine Solvent Accessibility" @default.
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• W2036027815 doi "https://doi.org/10.1021/bi800487c" @default.
• W2036027815 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2574756" @default.
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