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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 9, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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Published on: May 13, 2020

From electron microscopy to X-ray crystallography: molecular-replacement case studies.

Yong Xiong1

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511, USA. yong.xiong@yale.edu

Acta Crystallographica. Section D, Biological Crystallography
|December 21, 2007
PubMed
Summary

Electron microscopy (EM) maps can serve as effective models for molecular replacement (MR) in X-ray crystallography, aiding the structural determination of large molecular complexes. This approach facilitates phase extension to high resolution, advancing structural biology research.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Multi-component molecular complexes present significant challenges for traditional structural biology methods.
  • Electron microscopy (EM) is emerging as a complementary technique to X-ray crystallography for studying large biomolecular assemblies.

Purpose of the Study:

  • To evaluate the feasibility of using low-resolution electron microscopy (EM) maps as models for molecular replacement (MR) in X-ray crystallography.
  • To assess the effectiveness of MR using EM maps for phase extension to high resolution.

Main Methods:

  • Utilized five crystal structures of large molecular assemblies for test studies.
  • Employed standard molecular replacement (MR) packages (AMoRe, MOLREP, Phaser) with EM maps as models.
  • Investigated potential data analysis challenges, including EM magnification errors and MR positional/rotational errors.

Main Results:

  • Demonstrated that EM maps are viable and effective models for molecular replacement (MR).
  • Successfully used EM maps to aid structure determination and phase extension in X-ray crystallography.
  • Identified and discussed potential difficulties in data analysis, such as magnification and positional errors.

Conclusions:

  • Electron microscopy (EM) maps are suitable for molecular replacement (MR) in X-ray crystallography.
  • This integrated approach enhances the structural determination of large molecular complexes.
  • Further analysis is needed to address specific data analysis challenges for optimal results.