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Related Concept Videos

Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Cryo-electron Microscopy01:28

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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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Related Experiment Video

Updated: May 9, 2025

Optimizing Sample Preparation for Cryogenic Electron Microscopy
06:38

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

186

Optimizing Sample Preparation for Cryogenic Electron Microscopy.

Joohyun Lee1, Truc Kim2, Kyeong Kyu Kim3

  • 1Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine.

Journal of Visualized Experiments : Jove
|April 28, 2025
PubMed
Summary

Cryo-electron microscopy (cryo-EM) struggles with uneven particle distribution, impacting protein structure resolution. This study presents a practical sample preparation method to achieve homogeneous particle distribution for higher-quality cryo-EM structures.

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Optimizing Sample Preparation for Cryogenic Electron Microscopy
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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Cryo-electron microscopy (cryo-EM) visualizes macromolecular structures in near-native states.
  • Advancements in single-particle analysis and computation have made cryo-EM essential.
  • Uneven particle distribution is a key challenge, reducing cryo-EM resolution and accuracy.

Purpose of the Study:

  • To present a practical method for optimizing sample preparation in cryo-EM.
  • To address the challenge of uneven particle distribution.
  • To improve the quality of reconstructed protein structures using cryo-EM.

Main Methods:

  • Developed a sample preparation technique to minimize preferential adsorption.
  • Utilized the small heat-shock protein from Methanocaldococcus jannaschii (MjsHSP16.5) as a model system.
  • Focused on achieving homogeneous particle distribution on cryo-EM grids.

Main Results:

  • The optimized sample preparation resulted in more homogeneous particle distribution.
  • Minimized preferential adsorption of biomolecules.
  • Facilitated higher-quality cryo-EM structure reconstructions.

Conclusions:

  • The presented method offers a practical solution to improve cryo-EM sample preparation.
  • Homogeneous particle distribution is crucial for high-resolution structural studies.
  • This technique provides valuable guidance for researchers facing similar cryo-EM challenges.