Abstract
Molecular modeling guided by experimentally derived structural information is an attractive approach for three-dimensional structure determination of complex RNAs that are not amenable to study by high-resolution methods. Hydroxyl radical probing (HRP), which is performed routinely in many laboratories, provides a measure of solvent accessibility at individual nucleotides. HRP measurements have, to date, only been used to evaluate RNA models qualitatively. Here we report the development of a quantitative structure refinement approach using HRP measurements to drive discrete molecular dynamics simulations for RNAs ranging in size from 80 to 230 nucleotides. We first used HRP reactivities to identify RNAs that form extensive helical packing interactions. For these RNAs, we achieved highly significant structure predictions given the inputs of RNA sequence and base pairing. This HRP-directed tertiary structure refinement approach generates robust structural hypotheses that are useful for guiding explorations of structure-function inter-relationships in RNA.
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Acknowledgements
We thank E.A. Proctor, R. Redler and S. Ramachandran for critical readings of the manuscript. This work was supported by grants from the US National Institutes of Health to K.M.W. (GM064803) and N.V.D. (GM080742 and CA084480), by a US National Institutes of Health American Recovery and Reinvestment Act supplement (to K.M.W.) and by the University of North Carolina Research Council (to F.D.).
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F.D., K.M.W. and N.V.D. conceived of and designed the computational and experimental procedures. C.A.L. performed and analyzed the HRP measurements. F.D. developed the computational methodology and performed the computational analysis. F.D., C.A.L., K.M.W. and N.V.D. wrote the manuscript.
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Supplementary information
Supplementary Text and Figures
Supplementary Figures 1–7, Supplementary Tables 1 and 2 (PDF 4812 kb)
Supplementary Dataset
The HRP reactivities and interaction parameters for all RNAs (XLS 284 kb)
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Ding, F., Lavender, C., Weeks, K. et al. Three-dimensional RNA structure refinement by hydroxyl radical probing. Nat Methods 9, 603–608 (2012). https://doi.org/10.1038/nmeth.1976
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DOI: https://doi.org/10.1038/nmeth.1976
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