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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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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Optimizing Sample Preparation for Cryogenic Electron Microscopy
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Benchmarking the ideal sample thickness in cryo-EM.

Michael W Martynowycz1,2, Max T B Clabbers2, Johan Unge2

  • 1HHMI, University of California, Los Angeles, CA 90095.

Proceedings of the National Academy of Sciences of the United States of America
|December 7, 2021
PubMed
Summary
This summary is machine-generated.

This study reveals optimal sample thickness for microcrystal electron diffraction (MicroED) data quality. Thinner samples, up to twice the inelastic mean free path, yield reliable structures, crucial for cryo-electron microscopy (cryo-EM) methods.

Keywords:
Cryo-EMFIB millingMicroEDelectron scatteringmean free path

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Area of Science:

  • Structural Biology
  • Biophysics
  • Materials Science

Background:

  • Accurate structural determination using MicroED relies on high-quality diffraction data.
  • Sample thickness is a critical parameter influencing electron scattering and data quality in MicroED.

Purpose of the Study:

  • To investigate the relationship between sample thickness and MicroED data quality.
  • To establish optimal specimen thickness for reliable structural determination using MicroED.

Main Methods:

  • Proteinase K microcrystals were thinned into lamellae of varying thicknesses (95–1,650 nm) using focused ion beam milling.
  • Microcrystal electron diffraction (MicroED) data were collected at different accelerating voltages (120, 200, 300 kV).
  • Lamellae thicknesses were normalized to the inelastic mean free path for cross-voltage comparison.

Main Results:

  • Reliable structure determination was achieved for lamellae up to two times the inelastic mean free path.
  • Reduced diffraction resolution was observed at three times the inelastic mean free path, insufficient for structure determination.
  • No coherent diffraction was observed for lamellae thicker than four times the inelastic mean free path.

Conclusions:

  • Specimen thickness up to twice the inelastic mean free path is ideal for high-quality MicroED data and structure determination.
  • These findings provide critical benchmarks for sample preparation in MicroED and other cryo-EM techniques.
  • Understanding thickness limitations is essential for optimizing data acquisition and structural resolution in electron microscopy.