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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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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Related Experiment Video

Updated: Jan 4, 2026

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

Published on: July 1, 2022

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A potential difference for single-particle cryo-EM.

Peter B Rosenthal1

  • 1Structural Biology of Cells and Viruses Laboratory, The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.

Iucrj
|November 12, 2019
PubMed
Summary
This summary is machine-generated.

Researchers determined the structures of frozen protein and nucleic acid assemblies using low-voltage electron microscopy. This study highlights the benefits of lower operating voltages for single-particle cryo-electron microscopy (cryo-EM).

Keywords:
direct detectorselectron cryomicroscopylow-dose electron microscopysingle-particle cryoEM

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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Area of Science:

  • Structural biology
  • Biophysics
  • Electron microscopy

Background:

  • Determining the three-dimensional structure of biological macromolecules is crucial for understanding their function.
  • Single-particle cryo-electron microscopy (cryo-EM) has revolutionized structural biology, enabling high-resolution structure determination of large biomolecular assemblies.
  • Advancements in electron optics and detector technology are continuously improving cryo-EM capabilities.

Purpose of the Study:

  • To determine the structures of frozen-hydrated protein and nucleic acid assemblies using low-voltage electron microscopy.
  • To characterize electron microscopes optimized for lower operating voltages in single-particle cryo-EM.
  • To evaluate the advantages of reduced electron beam energy for cryo-EM applications.

Main Methods:

  • Utilizing a 100 keV electron microscope for imaging frozen-hydrated samples.
  • Applying single-particle analysis techniques to reconstruct 3D structures from 2D projection images.
  • Characterizing the performance and specific features of electron microscopes designed for low-voltage operation.

Main Results:

  • Successful determination of high-resolution structures of protein and nucleic acid assemblies.
  • Identification of specific microscope characteristics that enhance performance at lower operating voltages.
  • Demonstration of the feasibility and advantages of using 100 keV electrons for cryo-EM structure determination.

Conclusions:

  • Low-voltage electron microscopy is a viable and effective method for determining the structures of frozen-hydrated biomolecular assemblies.
  • Optimized electron microscopes can leverage lower operating voltages to improve image quality and data collection efficiency in cryo-EM.
  • This approach offers significant potential for advancing structural studies of sensitive biological macromolecules.