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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: Jul 6, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon

Published on: July 1, 2022

Overcoming resolution attenuation during tilted cryo-EM data collection.

Sriram Aiyer¹, Philip R Baldwin^1,2, Shi Min Tan³

¹Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, 92037, USA.

Nature Communications

|January 9, 2024

Summary

This summary is machine-generated.

Cryo-electron microscopy (cryo-EM) researchers can now overcome preferred specimen orientation issues using stage tilting. New workflows minimize resolution loss, enabling high-resolution structure determination and analysis of novel molecular interactions.

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Last Updated: Jul 6, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon

Published on: July 1, 2022

Strategies for Optimization of Cryogenic Electron Tomography Data Acquisition

Strategies for Optimization of Cryogenic Electron Tomography Data Acquisition

Published on: March 19, 2021

Routine Collection of High-Resolution cryo-EM Datasets Using 200 KV Transmission Electron Microscope

Routine Collection of High-Resolution cryo-EM Datasets Using 200 KV Transmission Electron Microscope

Published on: March 16, 2022

Area of Science:

Structural Biology
Biophysics
Biochemistry

Background:

Preferred specimen orientation in cryo-electron microscopy (cryo-EM) hinders high-resolution structure determination by causing anisotropic map resolution.
Specimen stage tilting is a known solution but often leads to significant resolution loss.

Purpose of the Study:

To develop and validate updated cryo-EM data collection and image processing workflows to mitigate resolution attenuation caused by stage tilting.
To enable high-resolution reconstruction of specimens with preferred orientations.

Main Methods:

Implementation of advanced data collection strategies involving specimen stage tilting up to 60 degrees.
Development of refined image processing workflows to correct for tilt-induced aberrations.
Application of these methods to multiple biological specimens, including a bacterial RNA polymerase.

Main Results:

Resolution attenuation was found to be negligible or significantly reduced across various tilt angles.
Reconstructions generated with and without stage tilting were virtually indistinguishable.
Achieved 3 Ångström resolution for a bacterial RNA polymerase with preferred orientation, revealing novel base pair recognition.

Conclusions:

The developed strategies effectively overcome preferred orientation challenges in cryo-EM without compromising resolution.
Stage tilting is a robust technique for obtaining isotropic maps and improving cryo-EM structure determination.
A quantitative framework is provided to guide optimal tilt angle selection during data acquisition.