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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
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Analysis of RNA structure using small-angle X-ray scattering.

William A Cantara1, Erik D Olson1, Karin Musier-Forsyth1

  • 1Department of Chemistry and Biochemistry, Center for Retrovirus Research, and Center for RNA Biology, The Ohio State University, Columbus, OH 43210, United States.

Methods (San Diego, Calif.)
|October 30, 2016
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Summary

Aminoacyl-tRNA synthetases (aaRS) perform additional functions beyond amino acid attachment, interacting with various nucleic acids. This study outlines best practices for using small-angle X-ray scattering (SAXS) to determine the structures of these RNA-protein complexes.

Keywords:
Aminoacyl-tRNA synthetaseNative PAGERNA structureSAXSSize-exclusion chromatographytRNA-like structures

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Aminoacyl-tRNA synthetases (aaRS) are known for their primary role in protein synthesis but also exhibit diverse alternative functions.
  • These enzymes frequently interact with various nucleic acids beyond their cognate tRNAs, highlighting their multifaceted biological roles.
  • Determining the three-dimensional structures of these RNA-protein complexes is crucial for understanding their alternative functions, yet remains challenging.

Purpose of the Study:

  • To provide a comprehensive guide on best practices for structural characterization of RNA and RNA-protein complexes using SAXS.
  • To detail methodologies for sample preparation, data collection, data analysis, and structural model building for SAXS experiments.
  • To facilitate the structural elucidation of RNA-protein interactions mediated by aaRSs and other proteins.

Main Methods:

  • Small-angle X-ray scattering (SAXS) is presented as a powerful technique for low-resolution tertiary structure determination.
  • Detailed protocols for preparing RNA and RNA-protein samples suitable for SAXS analysis are described.
  • Guidance on SAXS data collection, rigorous data analysis, and computational structural model building is provided.

Main Results:

  • SAXS offers a viable alternative to traditional structural methods like X-ray crystallography, NMR, and cryo-EM for RNA and RNA-protein complexes.
  • The described best practices enable the characterization of biomolecular structures under near-physiological conditions.
  • The methodology allows for the determination of low-resolution tertiary structure information with reduced sample preparation and data analysis burden.

Conclusions:

  • Small-angle X-ray scattering (SAXS) is an increasingly valuable tool for studying the structures of RNA and RNA-protein complexes.
  • Adherence to the outlined best practices can overcome existing challenges in RNA structure determination.
  • This work provides a framework for advancing the structural understanding of diverse RNA-protein interactions, including those involving aminoacyl-tRNA synthetases.