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Updated: Sep 2, 2025

Plunge Freezing: A Tool for the Ultrastructural and Immunolocalization Studies of Suspension Cells in Transmission Electron Microscopy
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Customising the plunge-freezing workflow for challenging conditions.

Ian Hands-Portman1, Saskia E Bakker1

  • 1Advanced Bioimaging Research Technology Platform, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK. s.bakker@warwick.ac.uk.

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|August 1, 2022
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Summary

Optimizing cryo-transmission electron microscopy grid preparation is crucial. This study details adaptations to a Leica plunge-freezer for special protein samples, enhancing cryo-EM reproducibility for challenging specimens.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Materials Science

Background:

  • Cryo-transmission electron microscopy (cryo-TEM) requires optimal grid freezing for high-resolution structure determination.
  • Modern plunge-freezers incorporate temperature and humidity control, typically using cold (4°C) humid conditions.
  • Standard conditions may not suit all biological or polymeric samples, presenting a bottleneck in cryo-EM workflows.

Purpose of the Study:

  • To describe modifications to a Leica GP2 plunge-freezer for accommodating samples with unique handling requirements.
  • To present methods for plunge-freezing sensitive proteins and temperature-dependent gelling polymers.
  • To offer solutions for improving cryo-EM sample preparation reproducibility for challenging specimens.

Main Methods:

  • Adaptations were made to a Leica GP2 plunge-freezer system.
  • Methods were developed for plunge-freezing proteins sensitive to light and oxygen.
  • Protocols were established for maintaining samples at 37°C during plunge-freezing and for freezing a polymer at its gelling temperature.

Main Results:

  • Successful plunge-freezing protocols were established for samples with specific environmental needs.
  • The adaptations allowed for the preservation of sample integrity under non-standard conditions.
  • The modified system demonstrated flexibility in handling diverse sample types.

Conclusions:

  • Standard plunge-freezing conditions are not universally applicable for cryo-EM sample preparation.
  • System modifications can overcome challenges posed by sensitive or temperature-dependent samples.
  • Sharing these adaptable methods can aid researchers in optimizing cryo-EM grid preparation for difficult specimens.