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Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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Solving protein nanocrystals by cryo-EM diffraction: multiple scattering artifacts.

Ganesh Subramanian1, Shibom Basu2, Haiguang Liu3

  • 1Department of Materials Science and Engineering, Arizona State University, Tempe, AZ, USA.

Ultramicroscopy
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

The single-scattering approximation for electron diffraction of protein crystals is limited by thickness. Molecular replacement (MR) improves structure determination for thicker crystals, enabling nanocrystal analysis up to 1000 Å.

Keywords:
Charge density mapElectron diffractionLysozymeMultiple scatteringProtein crystallographyR-factor

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Area of Science:

  • Structural Biology
  • Materials Science
  • Crystallography

Background:

  • Transmission electron diffraction (TED) is crucial for determining the structure of protein microcrystals.
  • The single-scattering approximation is often used but has limitations regarding crystal thickness.
  • Accurate structure determination relies on high-quality diffraction data and understanding scattering approximations.

Purpose of the Study:

  • To estimate the maximum permissible thickness for protein microcrystals within the single-scattering approximation using transmission electron diffraction.
  • To determine the validity domain of the single-scattering approximation under various diffraction conditions and beam energies.
  • To assess the impact of experimental errors and molecular replacement (MR) on structure determination.

Main Methods:

  • Multislice simulations were performed for tetragonal hen-egg lysozyme protein crystals.
  • R-factor analysis was employed to estimate the maximum permissible thickness under the single-scattering approximation.
  • The influence of erroneous structure factor amplitudes and phase information from MR was evaluated.

Main Results:

  • The single-scattering approximation is valid for thinner crystals; its limit depends on diffraction conditions and beam energy.
  • Molecular replacement (MR), utilizing phase information, significantly enhances structure determination for crystals thicker than approximately 200 Å, overriding poor diffraction data quality.
  • For perfectly ordered protein nanocrystals, a maximum thickness of approximately 1000 Å is predicted at 200 keV when MR is applied.

Conclusions:

  • The maximum crystal thickness for accurate structure determination via TED is constrained by the single-scattering approximation.
  • Molecular replacement is a powerful tool for overcoming data limitations and extending structural analysis to thicker protein nanocrystals.
  • Further research should consider crystal imperfections like bending and mosaicity, alongside advancements in crystal preparation techniques.