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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...
3.2K

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The CryoAPEX Method for Electron Microscopy Analysis of Membrane Protein Localization Within Ultrastructurally-Preserved Cells
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Cryo-electron microscopy of membrane proteins.

Kenneth N Goldie1, Priyanka Abeyrathne, Fabian Kebbel

  • 1Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University Basel, Basel, Switzerland.

Methods in Molecular Biology (Clifton, N.J.)
|December 21, 2013
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Summary

Electron crystallography uses cryo-electron microscopy (cryo-EM) to determine high-resolution structures of membrane proteins in 2D crystals. Meticulous sample preparation and low-dose data collection are crucial for accurate structural determination.

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Area of Science:

  • Structural biology
  • Biophysics
  • Cryo-electron microscopy

Background:

  • Electron crystallography is a powerful technique for studying membrane proteins in crystalline arrays.
  • Cryo-electron microscopy (cryo-EM) enables imaging of membrane proteins in their near-native state within lipid bilayers.
  • Previous studies have determined atomic resolution structures of key membrane proteins like bacteriorhodopsin and aquaporins.

Purpose of the Study:

  • To outline the critical aspects of sample preparation and data collection for high-resolution electron crystallography of membrane proteins.
  • To highlight methods for overcoming challenges such as beam-induced drift and specimen flatness.
  • To discuss the role of cryo-EM in preserving the structural integrity of delicate crystalline arrays.

Main Methods:

  • Utilizing electron crystallography to analyze two-dimensional (2D) and tubular crystals of membrane proteins.
  • Employing cryo-electron microscopy (cryo-EM) for imaging and electron diffraction.
  • Implementing meticulous sample preparation techniques, including symmetrical carbon film sandwiching and optimized grid choices.
  • Performing low-dose data collection with spot-scanning and automated acquisition schemes.

Main Results:

  • Demonstrated that symmetrical carbon film sandwiching reduces beam-induced drift, enhancing image resolution.
  • Showcased how optimized grid materials and preparation protocols improve specimen flatness.
  • Indicated that low-dose procedures and spot-scanning in cryo-EM are essential for high-resolution data acquisition.
  • Highlighted the increasing use of automated data collection and user-friendly software.

Conclusions:

  • Meticulous sample preparation is paramount for achieving high-resolution structures using electron crystallography.
  • Cryo-EM, combined with optimized protocols, allows for the near-native structural analysis of membrane proteins.
  • Advancements in data collection and processing are expanding the accessibility and applicability of electron crystallography.