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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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...
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon
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Using the Volta phase plate with defocus for cryo-EM single particle analysis.

Radostin Danev1, Dimitry Tegunov2, Wolfgang Baumeister1

  • 1Department of Molecular Structural Biology, Max Planck Institute of Biochemistry, Martinsried, Germany.

Elife
|January 22, 2017
PubMed
Summary

This study introduces a hybrid cryo-electron microscopy (cryo-EM) method combining in-focus and defocus imaging. This technique enhances data acquisition speed and allows for high-resolution 3D reconstructions beyond 3 Å.

Keywords:
biophysicscryo-EMnonephase plateproteasomestructural biology

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Area of Science:

  • Structural Biology
  • Microscopy Techniques

Background:

  • Previously reported in-focus data acquisition for cryo-EM using Volta phase plate.
  • Limitations of in-focus methods include resolution limits.

Purpose of the Study:

  • To extend the in-focus cryo-EM method by incorporating a small amount of defocus.
  • To enable contrast transfer function measurement and correction.
  • To improve experimental simplicity and data acquisition speed.

Main Methods:

  • Hybrid approach combining in-focus and defocus imaging in cryo-EM.
  • Utilized Volta phase plate technology.
  • Enabled contrast transfer function measurement and correction.

Main Results:

  • Achieved simplified experimental procedures.
  • Increased data acquisition speed significantly.
  • Overcame resolution limitations of the in-focus method.
  • Enabled 3D reconstructions with resolutions better than 3 Å.

Conclusions:

  • The hybrid in-focus/defocus cryo-EM method is a powerful advancement.
  • This technique offers faster, simpler, and higher-resolution structural analysis.
  • Facilitates routine high-resolution cryo-EM single-particle analysis.