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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.9K
Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
3.9K

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Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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Devitrification reduces beam-induced movement in cryo-EM.

Jan-Philip Wieferig1, Deryck J Mills1, Werner Kühlbrandt1

  • 1Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt, Germany.

Iucrj
|March 12, 2021
PubMed
Summary
This summary is machine-generated.

Controlled devitrification of ice in cryo-electron microscopy (cryo-EM) significantly reduces beam-induced movement. This method enhances high-resolution structure determination by preserving initial image data from radiation damage.

Keywords:
beam-induced movementcryo-EMdevitrification

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Area of Science:

  • Structural Biology
  • Biophysics
  • Microscopy

Background:

  • Cryo-electron microscopy (cryo-EM) faces challenges in high-resolution structure determination due to beam-induced movement.
  • This movement, caused by electron irradiation, leads to image blurring and loss of critical high-resolution information, especially in unsupported vitrified water films.

Purpose of the Study:

  • To investigate a method to mitigate beam-induced movement in cryo-EM.
  • To improve the quality of structural data obtained from biological specimens.

Main Methods:

  • Controlled devitrification of conventionally plunge-frozen samples to convert vitrified water into mechanically stable cubic ice.
  • Single-particle cryo-EM data collection and 3D reconstruction using minimally damaged frames.

Main Results:

  • Devitrification reduced beam-induced movement by approximately fourfold in the initial electron exposure (5 e⁻/Ų).
  • This reduction substantially improved the contribution of early, less damaged frames to the final structure.
  • A 3D apoferritin map reconstructed from devitrified samples resolved undamaged side chains.

Conclusions:

  • Devitrification of frozen-hydrated specimens is an effective strategy to overcome beam-induced specimen motion in single-particle cryo-EM.
  • This technique advances the capability of cryo-EM for achieving high-resolution biological structure determination.