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Determination of the conformational ensemble of the TAR RNA by X-ray scattering interferometry

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkw1352· OSTI ID:1625552
 [1];  [2];  [3];  [4]
  1. Stanford Univ., CA (United States). Dept. of Biochemistry; DOE/OSTI
  2. Stanford Univ., CA (United States). Protein and Nucleic Acids Facility
  3. Stanford Univ., CA (United States). Dept. of Biochemistry; Stanford Univ., CA (United States). ChEM-H
  4. Stanford Univ., CA (United States). Dept. of Biochemistry; Stanford Univ., CA (United States). ChEM-H; Stanford Univ., CA (United States). Dept. of Chemistry; Stanford Univ., CA (United States). Dept. of Chemical Engineering
The conformational ensembles of structured RNA’s are crucial for biological function, but they remain difficult to elucidate experimentally. We demonstrate with HIV-1 TAR RNA that X-ray scattering interferometry (XSI) can be used to determine RNA conformational ensembles. X-ray scattering interferometry (XSI) is based on site-specifically labeling RNA with pairs of heavy atom probes, and precisely measuring the distribution of inter-probe distances that arise from a heterogeneous mixture of RNA solution structures. We show that the XSI-based model of the TAR RNA ensemble closely resembles an independent model derived from NMR-RDC data. Further, we show how the TAR RNA ensemble changes shape at different salt concentrations. Finally, we demonstrate that a single hybrid model of the TAR RNA ensemble simultaneously fits both the XSI and NMR-RDC data set and show that XSI can be combined with NMRRDC to further improve the quality of the determined ensemble. The results suggest that XSI-RNA will be a powerful approach for characterizing the solution conformational ensembles of RNAs and RNA-protein complexes under diverse solution conditions.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1625552
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 8 Vol. 45; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Resolving sugar puckers in RNA excited states exposes slow modes of repuckering dynamics journal June 2017
Gold nanocrystal labels provide a sequence–to–3D structure map in SAXS reconstructions journal May 2018

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