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Cryo-electron Microscopy

Cryo-electron Microscopy

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: Oct 21, 2025

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Published on: May 29, 2021

Validation, analysis and annotation of cryo-EM structures.

Grigore Pintilie¹, Wah Chiu¹

¹Department of Bioengineering, James H. Clark Center, Stanford University, Stanford, CA 94305, USA.

Acta Crystallographica. Section D, Structural Biology

|September 2, 2021

Summary

This summary is machine-generated.

This study details validation methods for cryo-electron microscopy (cryo-EM) 3D atomic models. It covers assessing map resolution, validating atomic models against density, and identifying small molecules in high-resolution maps.

Keywords:

Fourier shell correlation annotation cryo-EM modeling validation

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Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

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Last Updated: Oct 21, 2025

Single Particle Cryo-Electron Microscopy: From Sample to Structure

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Published on: May 29, 2021

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

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Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

Published on: July 19, 2024

Area of Science:

Structural Biology
Biophysics
Biochemistry

Background:

Cryo-electron microscopy (cryo-EM) is a powerful technique for determining macromolecular structures.
The process of generating 3D atomic models from 2D cryo-EM micrographs requires rigorous validation.

Purpose of the Study:

To describe essential validation methods for cryo-EM 3D atomic model building.
To provide guidance on assessing map quality and model accuracy.

Main Methods:

Fourier Shell Correlation (FSC) for map resolution assessment.
Phase randomization for resolution estimation.
Q-scores and FSC plots for map-model validation.
B-factor annotation for atomic resolvability.
Detection of water molecules and ions in high-resolution maps.

Main Results:

FSC and phase randomization are key for evaluating cryo-EM map resolution.
Map-model comparison metrics ensure atomic model accuracy.
B-factors reflect atomic resolvability within the map.
High-resolution maps enable validation of water molecules and ions.

Conclusions:

Comprehensive validation is crucial at multiple stages of cryo-EM structure determination.
These methods ensure the reliability and accuracy of 3D atomic models derived from cryo-EM data.
Advanced validation techniques support the interpretation of high-resolution cryo-EM maps.