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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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Related Experiment Video

Updated: Nov 24, 2025

Manual Blot-and-Plunge Freezing of Biological Specimens for Single-Particle Cryogenic Electron Microscopy
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Detection of Microcrystals for CryoEM.

Simon Weiss1, Sandra Vergara1, Guowu Lin1

  • 1Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 28, 2020
PubMed
Summary

This study introduces a method using negative stain transmission electron microscopy (TEM) to find and improve microcrystal quality for advanced structural analysis. This technique aids in optimizing crystal lattices for Microcrystal Electron Diffraction (MicroED) and larger crystal growth.

Keywords:
Brightfield microscopyCrystal lattice qualityFFT-calculationGranular aggregateMicrocrystalNegative staining TEMOptimizationProtein crystallizationUV microscopy

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Microcrystal Electron Diffraction of Small Molecules
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Microcrystal Electron Diffraction of Small Molecules
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Area of Science:

  • Structural biology
  • Biophysics
  • Materials science

Background:

  • Protein crystallization is crucial for determining protein structures.
  • Identifying and optimizing microcrystals for diffraction is challenging.
  • Existing methods lack real-time feedback for crystal lattice quality.

Purpose of the Study:

  • To develop a strategy for identifying and optimizing microcrystals from screening experiments.
  • To utilize negative stain transmission electron microscopy (TEM) as a guiding tool for crystal optimization.
  • To enable the use of high-quality nanocrystals for Microcrystal Electron Diffraction (MicroED) and X-ray/FEL data collection.

Main Methods:

  • Protein crystallization screening.
  • Negative stain transmission electron microscopy (TEM) for visualization and lattice quality assessment.
  • Seeding nanocrystals with optimized lattices.

Main Results:

  • Successful identification of microcrystals from initial screens.
  • Optimization of crystal diffraction quality by monitoring lattice perfection using TEM.
  • Generation of high-quality nanocrystals suitable for MicroED and larger crystal growth.

Conclusions:

  • Negative stain TEM is an effective guiding technique for microcrystal identification and optimization.
  • This strategy enhances the success rate of obtaining high-quality crystals for various diffraction techniques.
  • The method facilitates the advancement of structural determination for proteins and other macromolecules.