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Updated: Apr 10, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Resolving Individual Components in Protein-RNA Complexes Using Small-Angle X-ray Scattering Experiments.

Robert P Rambo¹

¹Diamond Light Source Ltd., Harwell Science & Innovation Campus, Didcot, United Kingdom.

Methods in Enzymology

|June 13, 2015

Summary

This study introduces a multiphase volumetric modeling method to analyze low-resolution shapes of protein-RNA complexes using small-angle X-ray scattering (SAXS). The approach can resolve individual components and visualize ligand-induced changes in complexes.

Keywords:

Complexes Flexibility MONSA Modeling Protein RNA SAXS ScÅtter Volume-of-correlation Volumetric

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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Last Updated: Apr 10, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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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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Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

Structural Biology
Biophysics
Biochemistry

Background:

Small-angle X-ray scattering (SAXS) is a valuable technique for determining the low-resolution structures of biological macromolecules in solution.
Analyzing complex assemblies like protein-RNA interactions using SAXS requires advanced computational methods to resolve individual components.

Purpose of the Study:

To present a multiphase volumetric modeling approach for deconstructing low-resolution SAXS shapes of protein-RNA complexes.
To demonstrate the capability of resolving individual components within a complex and visualizing conformational changes.

Main Methods:

Utilized a multiphase volumetric modeling approach applied to SAXS data of protein-RNA complexes.
Employed SAXS data collection strategies, premodeling analysis, and computational methods including ScÅtter and MONSA programs.
Integrated custom scripts for averaging and aligning multiple independent modeling runs.

Main Results:

Successfully resolved individual components within low-resolution SAXS shapes of protein-RNA complexes.
Demonstrated the ability to image small masses (as low as 7kDa) within complex structures.
Visualized ligand-induced conformational changes in the studied complexes.

Conclusions:

The developed multiphase volumetric modeling approach is effective for detailed analysis of protein-RNA complexes using SAXS.
The method allows for the visualization of substructures and dynamic changes within macromolecular assemblies.
Considerations for SAXS data reduction and modeling are crucial to mitigate potential computational errors.