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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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The CryoAPEX Method for Electron Microscopy Analysis of Membrane Protein Localization Within Ultrastructurally-Preserved Cells
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Anaerobic cryoEM protocols for air-sensitive nitrogenase proteins.

Rebeccah A Warmack1,2, Belinda B Wenke3, Thomas Spatzal3

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA. rwarmack@caltech.edu.

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|April 4, 2024
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Summary

This study introduces an anaerobic workflow for single-particle cryo-electron microscopy (cryoEM), enabling high-resolution structural analysis of air-sensitive biological molecules like nitrogenase enzymes.

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Microscopy

Background:

  • Single-particle cryo-electron microscopy (cryoEM) is crucial for atomic resolution studies.
  • Current cryoEM methods primarily focus on aerobic samples, limiting the study of air-sensitive biological systems.
  • Air-sensitive enzymes and microorganisms are vital yet understudied in structural biology.

Purpose of the Study:

  • To develop and detail an anaerobic workflow for single-particle cryoEM.
  • To enable high-resolution structural determination of oxygen-sensitive proteins, specifically nitrogenase enzymes.
  • To provide a protocol adaptable for other air-sensitive biological samples.

Main Methods:

  • Utilized Schlenk lines and anaerobic chambers for sample preparation under an inert atmosphere.
  • Incorporated a protein tag to monitor oxygen exposure.
  • Adapted a plunge freezing apparatus within a specialized anaerobic chamber for cryoEM grid preparation.
  • Implemented a custom vacuum port for safe evacuation of flammable vapors.

Main Results:

  • Successfully obtained high-resolution structures of nitrogenase proteins using the developed anaerobic cryoEM workflow.
  • Demonstrated the efficacy of the protocol for characterizing air-sensitive enzymes.
  • Established a comprehensive protocol involving anaerobic sample generation and cryoEM preparation.

Conclusions:

  • The developed anaerobic cryoEM workflow successfully overcomes limitations in studying air-sensitive biological systems.
  • This methodology significantly advances the structural biology of enzymes like nitrogenase.
  • The protocol is adaptable for various controlled gas environments and oxygen-sensitive proteins.