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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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 keV in...
Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
10:39

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Published on: September 14, 2014

SINGLE MOLECULE 3D STRUCTURES DETERMINED BY INDIVIDUAL-PARTICLE ELECTRON TOMOGRAPHY.

Gang Ren1

  • 1The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Iscience Notes
|February 20, 2026
PubMed
Summary

Individual-particle electron tomography (IPET) reveals unbiased 3D structures of single molecules without averaging. This method captures dynamic conformational changes crucial for understanding cellular functions.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Structural biology
  • Biophysics
  • Biochemistry

Background:

  • Macromolecules like proteins and nucleic acids undergo dynamic structural changes essential for cellular functions.
  • Current methods (X-ray crystallography, cryo-EM) provide high-resolution static structures but struggle with low-resolution, flexible conformations and rare states.
  • Averaging processes in traditional methods limit the capture of the full conformational landscape.

Purpose of the Study:

  • To develop a novel method for characterizing the structural dynamics of single macromolecules without averaging.
  • To overcome the limitations of existing techniques in resolving flexible structures and capturing the complete distribution of molecular conformations.
  • To enable the study of molecular dynamics, phase transitions, and structural alterations during biological processes.

Main Methods:

  • Development and application of individual-particle electron tomography (IPET).
  • Acquisition of images at multiple tilt angles for each particle.
  • Reconstruction of detailed 3D density maps from individual particle images without averaging.
  • Low-to-intermediate resolution (up to 2 nm) structural determination.

Main Results:

  • IPET successfully determines 3D structures of single particles at low-to-intermediate resolution.
  • The method provides unbiased structural distributions, including flexible regions and unique particle structures.
  • IPET avoids the limitations of averaging, revealing a more complete picture of molecular conformations.
  • Facilitates flexible model fitting to captured density maps.

Conclusions:

  • Individual-particle electron tomography (IPET) is a powerful technique for studying macromolecular dynamics.
  • IPET offers an unbiased approach to characterizing the full range of molecular structures and conformational states.
  • This method enhances the understanding of molecular dynamics, phase transitions, and structural changes during biological processes like self-folding.