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Related Concept Videos

RNA Structure01:23

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Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Related Experiment Video

Updated: Aug 20, 2025

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
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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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Deriving RNA topological structure from SAXS.

Xianyang Fang1, José Gallego2, Yun-Xing Wang3

  • 1Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China.

Methods in Enzymology
|November 21, 2022
PubMed
Summary
This summary is machine-generated.

Small-angle X-ray scattering (SAXS) effectively determines the structures of flexible RNA molecules, offering valuable insights into their biological functions. This method provides low-resolution models crucial for understanding RNA conformational dynamics.

Keywords:
MethodsRNASAXSTopological structure

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Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Biophysics

Background:

  • Determining atomic-resolution structures of flexible RNA molecules is challenging with traditional methods like X-ray crystallography, cryo-electron microscopy (cryo-EM), and nuclear magnetic resonance (NMR) spectroscopy.
  • Flexible RNAs represent a significant portion of the RNA conformational space and play crucial roles in various biological processes.
  • Existing structural biology techniques often struggle with the dynamic nature of these molecules, limiting our understanding of their function.

Purpose of the Study:

  • To present a comprehensive methodology for determining the topological structures of flexible RNA molecules in solution using small-angle X-ray scattering (SAXS).
  • To highlight the advantages of SAXS for studying conformationally dynamic RNAs, providing global structural information and low-resolution models.
  • To demonstrate the application of SAXS in bridging secondary structure data with three-dimensional structural descriptions for a diverse range of RNA molecules.

Main Methods:

  • Utilizing small-angle X-ray scattering (SAXS) due to RNA's sensitivity to X-rays, allowing data collection under near-physiological conditions without labeling.
  • Applying specific algorithms and computational protocols for the analysis of SAXS data to generate molecular envelopes and topological structural models.
  • Integrating SAXS data with secondary structure information to build comprehensive three-dimensional structural descriptions.

Main Results:

  • SAXS enables the study of flexible RNAs at sub-micromolar concentrations under near-physiological conditions.
  • The method successfully generates molecular envelopes and low-resolution topological models for conformationally dynamic RNA molecules.
  • Case studies illustrate the broad applicability of SAXS across various RNA conformational landscapes, validating the methodology.

Conclusions:

  • SAXS is a powerful and advantageous technique for characterizing the global structures of flexible RNAs, complementing other structural biology methods.
  • The presented protocols provide a robust framework for topological structure determination of RNA molecules in solution.
  • This approach significantly enhances our ability to understand the structure-function relationships of the vast majority of RNA conformational space.