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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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Characterization of Membrane Proteins Using Cryo-Electron Microscopy.

Vanessa Carvalho1, Joachim W Pronk1, Andreas H Engel1

  • 1Department of Bionanoscience, Applied Sciences, Delft University of Technology, Delft, The Netherlands.

Current Protocols in Protein Science
|September 11, 2018
PubMed
Summary

Advances in 3D cryo-electron microscopy (cryo-EM) enable atomic-scale structure determination. This study details membrane protein preparation and data acquisition for high-resolution cryo-EM analysis.

Keywords:
2D crystalsbicellescryo-EMdetergentnanodiscsproteoliposomesvitrification

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Microscopy

Background:

  • 3D cryo-electron microscopy (cryo-EM) has rapidly advanced, enabling atomic-scale structure determination.
  • Historically, slow progress in cryo-EM was hampered by challenges like beam damage.

Purpose of the Study:

  • To outline methods for preparing membrane proteins for 3D cryo-EM.
  • To describe data acquisition strategies for vitrified membrane protein samples.

Main Methods:

  • Improvements in instrumentation and software for analyzing elastically scattered electrons.
  • Development of fast, single-electron detecting cameras.
  • Vitrification of samples on grids for cryo-EM.

Main Results:

  • Atomic-scale resolution is now more accessible due to technological advancements.
  • Successful purification of membrane protein complexes is crucial for structural insights.

Conclusions:

  • Modern 3D cryo-EM technologies offer unprecedented possibilities for structural biology.
  • Effective sample preparation and data acquisition are key to unlocking the potential of cryo-EM for membrane proteins.