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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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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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Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Related Experiment Video

Updated: Jun 27, 2025

Optimizing Sample Preparation for Cryogenic Electron Microscopy
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Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

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Electrospray-assisted cryo-EM sample preparation to mitigate interfacial effects.

Zi Yang1,2, Jingjin Fan3, Jia Wang1,2

  • 1Ministry of Education Key Laboratory of Protein Sciences, Beijing Frontier Research Center of Biological Structures, School of Life Sciences, Tsinghua University, Beijing, China.

Nature Methods
|April 25, 2024
PubMed
Summary

A new method, electrospray ionization cryogenic electron microscopy preparation (ESI-cryoPrep), preserves protein structure during specimen preparation. This technique avoids denaturation and orientation issues, enabling high-resolution 3D reconstructions of macromolecules.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Cryo-Electron Microscopy

Background:

  • Interfacial effects during specimen preparation pose challenges in cryogenic electron microscopy (cryo-EM).
  • Macromolecule adsorption at interfaces can lead to protein denaturation and preferred orientation artifacts.
  • Existing methods struggle to maintain protein integrity and achieve optimal ice thickness for cryo-EM analysis.

Purpose of the Study:

  • To introduce ESI-cryoPrep, a novel specimen preparation method for cryo-EM.
  • To address challenges of protein denaturation and preferred orientation in cryo-EM sample preparation.
  • To improve the quality of cryo-specimens for high-resolution structural analysis of macromolecules.

Main Methods:

  • Developed ESI-cryoPrep, a method integrating electrospray ionization (ESI) with native mass spectrometry principles.
  • Optimized ESI spraying parameters to control droplet size, charge, and ice thickness.
  • Utilized the protective mechanism of charged droplets to prevent biomolecule adsorption at interfaces.

Main Results:

  • Successfully prepared high-quality cryo-specimens of five different proteins using ESI-cryoPrep.
  • Achieved near-atomic resolution three-dimensional reconstructions for the analyzed proteins.
  • Demonstrated effective confinement of macromolecules within amorphous ice, enabling blotting-free sample preparation.

Conclusions:

  • ESI-cryoPrep effectively preserves protein integrity and prevents structural damage during cryo-EM specimen preparation.
  • The method mitigates preferred orientation issues by preventing biomolecule adsorption at air-water or graphene-water interfaces.
  • ESI-cryoPrep facilitates the preparation of high-quality, vitreous samples suitable for high-resolution cryo-EM structural determination.