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Related Concept Videos

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.
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Updated: Sep 10, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon
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Exploiting Anisotropic Orientation in Nanoparticle-Aided Cryo-Electron Microscopy Sampling.

Yeeun Kim1, Changin Kim2, Yongsoo Yang3

  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

Methods (San Diego, Calif.)
|August 23, 2025
PubMed
Summary
This summary is machine-generated.

Single-tilt angle nanoparticle-aided cryo-EM sampling (ST-NACS) efficiently measures protein conformational changes. This method determines interparticle distance distribution (P(d)) using gold nanoparticle (AuNP) pair angles, simplifying structural analysis.

Keywords:
Anisotropic angle distributionCryo-electron microscopyGold nanoparticle labelingProtein heterogeneous conformationTilt-series analysis

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Area of Science:

  • Structural biology
  • Biophysics
  • Cryo-electron microscopy

Background:

  • Understanding small protein conformational dynamics is crucial for elucidating biological functions.
  • Nanoparticle-aided cryo-electron microscopy sampling (MT-NACS) uses multiple-tilt angles to measure protein conformational distributions via interparticle distances.
  • Current MT-NACS methods are time-consuming due to particle tracking requirements.

Purpose of the Study:

  • To develop a more efficient method for measuring protein conformational distributions.
  • To determine if protein structural transitions can be reliably assessed using single-tilt angle cryo-EM data.
  • To simplify the analysis of cryo-EM data for conformational studies.

Main Methods:

  • Incorporation of gold nanoparticle (AuNP) pair angle distribution into data analysis.
  • Utilizing cryo-electron microscopy (cryo-EM) images collected at a single tilt angle.
  • Applying the developed single-tilt angle NACS (ST-NACS) method to calmodulin (CaM).

Main Results:

  • Reliable determination of the three-dimensional interparticle distance distribution (P(d)) using single-tilt angle cryo-EM data.
  • Consistent measurement of calmodulin structural changes between ST-NACS and multi-tilt angle NACS (MT-NACS).
  • Demonstration that ST-NACS accurately reflects conformational changes by observing similar P(d) trends.

Conclusions:

  • Single-tilt angle NACS (ST-NACS) provides an efficient and reliable tool for measuring protein conformational distributions.
  • The method simplifies structural analysis, reducing the time and effort required for cryo-EM studies.
  • ST-NACS is effective for monitoring structural transitions in small proteins.