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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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Updated: Aug 5, 2025

Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy
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A simple flash and freeze system for cryogenic time-resolved electron microscopy.

Biddut Bhattacharjee1, Md Mahfuzur Rahman2, Ryan E Hibbs2

  • 1University of Colorado Boulder, Boulder, United States.

Frontiers in Molecular Biosciences
|March 24, 2023
PubMed
Summary

We developed a novel LED photo-flash system for cryogenic time-resolved electron microscopy (cryoTREM). This cost-effective, plug-and-play system ensures uniform sample irradiation with minimal heating before plunge freezing, advancing dynamic macromolecular studies.

Keywords:
CryoEMLEDcaged compoundsoptogenetic activationplug & playplunge freezertime resolvedvitrification

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Area of Science:

  • Structural Biology
  • Biophysics
  • Electron Microscopy

Background:

  • Macromolecular complexes are dynamic and undergo conformational changes critical for function.
  • Understanding these dynamics requires time-resolved methods to bridge static structures with function.
  • Cryogenic electron microscopy (CryoEM) is expanding into time-resolved techniques (cryoTREM).

Purpose of the Study:

  • To introduce a novel LED-based photo-flash system for sample preparation in cryoTREM.
  • To demonstrate its utility with standard plunge freezing equipment.
  • To assess potential adverse heating effects on biological samples.

Main Methods:

  • Development of a plug-and-play LED photo-flash system with adjustable parameters.
  • Integration and testing with Thermo Scientific Vitrobot and Leica EM GP2 plunge freezers.
  • Theoretical and experimental evaluation of sample heating effects.

Main Results:

  • The LED system provides uniform irradiation and minimal sample heating.
  • The system is cost-effective and easy to implement.
  • Heating effects were quantified and found to be within acceptable limits.

Conclusions:

  • The developed LED photo-flash system is a valuable tool for cryoTREM sample preparation.
  • It enables the study of dynamic macromolecular processes at high resolution.
  • This technology facilitates the coupling of static structures to biological functions.