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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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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Related Experiment Video

Updated: Jun 29, 2025

Preparation and Cryo-FIB micromachining of Saccharomyces cerevisiae for Cryo-Electron Tomography
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Bridging structural and cell biology with cryo-electron microscopy.

Eva Nogales1,2,3, Julia Mahamid4,5

  • 1Molecular and Cell Biology Department, Institute for Quantitative Biomedicine, University of California, Berkeley, CA, USA. enogales@lbl.gov.

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|April 3, 2024
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Summary

Structural biology and cell biology offer complementary views of cellular processes. Combining cryogenic electron microscopy (cryo-EM) with cryo-electron tomography (cryo-ET) visualizes macromolecules in situ, bridging structural and cellular insights.

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Area of Science:

  • Structural Biology
  • Cell Biology
  • Biophysics

Background:

  • Understanding cellular processes necessitates structural knowledge of macromolecules.
  • Traditional structural biology (e.g., X-ray crystallography) requires purified samples, often losing native context.
  • Cryo-electron microscopy (cryo-EM) enables studying large, complex, or difficult-to-crystallize samples but still requires purification.

Purpose of the Study:

  • To bridge the gap between structural biology and cell biology.
  • To explore the potential of visualizing macromolecules within their natural cellular environment.
  • To develop comprehensive structural depictions of macromolecular interactions in situ.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) for high-resolution structural determination.
  • Cryo-electron tomography (cryo-ET) for visualizing cellular structures in situ.
  • Integration of cryo-EM and cryo-ET to visualize macromolecules within their native cellular context.

Main Results:

  • Cryo-EM and cryo-ET provide complementary resolutions, from atomic detail to cellular architecture.
  • The combined approach allows for the visualization of purified macromolecules and their localization within the cell.
  • This integration facilitates understanding macromolecular function in its native environment.

Conclusions:

  • The interplay between cryo-EM and cryo-ET offers a powerful approach to visualize macromolecules in situ.
  • This integrated methodology promises to create comprehensive structural models of cellular processes.
  • It bridges the gap between reductionist structural biology and holistic cell biology, advancing our understanding of life at the molecular level.