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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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Nanosecond Hyperquenching for Electron Cryo-Microscopy Without Air-Water Interface Artifacts.

Utz H Ermel1, Harald Schwalbe2, Alexey V Cherepanov2

  • 1Electr, on Microscopy Group, Buchmann Institute for Molecular Life Sciences (BMLS), Johann Wolfgang Goethe-University, Max-von-Laue-Straße 15, D-60438, Frankfurt am Main, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 3, 2025
PubMed
Summary

Nanosecond hyperquenching (NHQ) prepares electron cryo-microscopy samples without air-water interface artifacts. This method prevents protein damage by forming vitrified films directly in cryogen, avoiding surface tension effects.

Keywords:
Air-water interface (AWI)High-pressure jet freezingMolecular shock wave mechanicsNanosecond hyperquenching (NHQ)Time-resolved electron cryo-microscopy (trECM)

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Area of Science:

  • Structural Biology
  • Biophysics
  • Cryo-Electron Microscopy

Background:

  • Specimen preparation for electron cryo-microscopy (ECM) is challenged by artifacts from air-water interface (AWI) surface tension.
  • These artifacts include protein adsorption, preferred orientation, dissociation, and denaturation, hindering high-resolution imaging.

Purpose of the Study:

  • To introduce nanosecond hyperquenching (NHQ) as a novel method for preparing ECM samples.
  • To eliminate AWI-bound protein macromolecules and associated preparation artifacts.

Main Methods:

  • NHQ involves a fast, narrow sample jet impinging a eutectic propane-ethane (PET) cryogen at 77 K.
  • This process forms thin (30-150 nm) vitrified films directly within the cryogen, bypassing the AWI.

Main Results:

  • NHQ successfully prevents AWI-induced protein artifacts.
  • Formed films exhibit specimen-free surfaces with a 2.7-nm protein-depleted layer of hyperquenched glassy water (HGW).
  • Surface sealing via HGW layer formation occurs within approximately 35 ps, displacing proteins inwards.

Conclusions:

  • NHQ offers a superior method for ECM sample preparation by avoiding AWI tension.
  • The "surface sealing" mechanism is critical for vitrification under NHQ conditions.
  • This technique enhances the quality of vitrified samples for high-resolution structural analysis.