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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Related Experiment Video

Updated: Dec 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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Integrating solvation shell structure in experimentally driven molecular dynamics using x-ray solution scattering

Darren J Hsu1, Denis Leshchev1, Irina Kosheleva2

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

The Journal of Chemical Physics
|June 4, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new molecular dynamics (MD) simulation method using x-ray solution scattering to guide protein structure prediction. This approach enhances accuracy by including hydration effects and GPU acceleration for faster, more reliable results.

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Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

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Last Updated: Dec 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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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution
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Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

Published on: January 8, 2013

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Molecular dynamics (MD) simulations are crucial for predicting protein structures.
  • Current MD methods sometimes yield results that conflict with experimental data.
  • Improved strategies are needed to align computational predictions with experimental observations.

Purpose of the Study:

  • To develop a scalable and efficient MD simulation approach for exploring protein conformational landscapes.
  • To integrate x-ray solution scattering data as a driving force for conformational searches.
  • To improve the accuracy of MD simulations by incorporating hydration layer effects.

Main Methods:

  • Developed an MD simulation protocol incorporating x-ray solution scattering signals.
  • Included hydration layer effects in simulations for processes like protein unfolding.
  • Utilized graphics processing units (GPUs) for efficient, on-the-fly calculation of scattering patterns.
  • Applied the method to lysine-, arginine-, ornithine-binding protein and deca-alanine.

Main Results:

  • Demonstrated a scalable and efficient MD approach driven by x-ray solution scattering.
  • Showcased the importance of hydration effects for accurate simulation of unfolding.
  • Achieved significant speed-up in calculations using GPU acceleration for all-atom simulations.
  • Validated the methodology on two model protein systems.

Conclusions:

  • The developed MD approach effectively guides conformational searches using experimental scattering data.
  • Inclusion of hydration layers improves the description of protein dynamics and conformational changes.
  • This method offers a powerful tool for interpreting scattering experiments in protein folding and association studies.