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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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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.
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Related Experiment Video

Updated: Jan 15, 2026

Sample Preparation by 3D-Correlative Focused Ion Beam Milling for High-Resolution Cryo-Electron Tomography
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Single-Molecule 3D Nanoscopy for Application to Cryofixed Samples.

Kanta Naruse1,2, Tsuyoshi Matsuda1, Yuta Mizouchi1

  • 1Department of Physics, Institute of Science, Tokyo, Meguro, Tokyo 152-3550, Japan.

The Journal of Physical Chemistry. B
|October 9, 2025
PubMed
Summary
This summary is machine-generated.

Cryogenic 3D nanoscopy achieves angstrom-scale biomolecular structure preservation. This new technique enables nanometer-scale 3D localization accuracy for individual fluorophores, overcoming previous axial limitations.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Cryo-electron microscopy

Background:

  • Cryogenic conditions preserve biomolecular structures at the angstrom scale in vitrified ice.
  • Reduced fluorophore photobleaching under cryogenic conditions enhances lateral localization accuracy.
  • Axial localization accuracy remains a significant challenge, limited to tens of nanometers.

Purpose of the Study:

  • To develop a cryogenic 3D nanoscopy system for angstrom-scale resolution.
  • To achieve nanometer-scale localization accuracy in all three dimensions for individual fluorophores.
  • To overcome limitations in axial localization accuracy in previous cryogenic microscopy techniques.

Main Methods:

  • Utilized multifocal plane detection for near shot-noise-limited localization.
  • Minimized errors from blinking, dipole orientation, and background emission.
  • Employed double-stranded DNA (dsDNA) molecules with conjugated fluorophores for validation.

Main Results:

  • Demonstrated 3D localization accuracy in the nanometer range under cryogenic conditions.
  • Measured a 3D distance of 20 ± 8 nm between fluorophores on a 17 nm dsDNA molecule at 1.9 K.
  • Achieved localization error comparable to the shot-noise limit, validating the system's precision.

Conclusions:

  • Cryogenic 3D nanoscopy successfully achieves nanometer-scale 3D localization accuracy.
  • The developed system overcomes previous axial localization limitations in cryogenic microscopy.
  • This technique holds potential for high-resolution structural analysis of biomolecules.