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Related Concept Videos

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Related Experiment Video

Updated: Aug 2, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon
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Visualizing Heterogeneous Protein Conformations with Multi-Tilt Nanoparticle-Aided Cryo-Electron Microscopy Sampling.

Changin Kim1,2,3, Yeeun Kim4, Sang Jin Lee1,2,3

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

Nano Letters
|April 17, 2023
PubMed
Summary
This summary is machine-generated.

A new multi-tilt nanoparticle-aided cryo-electron microscopy sampling (MT-NACS) technique reveals small protein dynamics. This method captures heterogeneous protein conformations, crucial for understanding biological functions.

Keywords:
calmodulincryo-electron microscopygold nanoparticle labelingsmall-protein heterogeneous conformationtilt series analysis

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Area of Science:

  • Structural Biology
  • Biophysics
  • Cryo-Electron Microscopy

Background:

  • Understanding the heterogeneous conformations of small proteins is vital for elucidating their biological roles.
  • Current methods face challenges in observing these dynamic structural variations in small proteins.

Purpose of the Study:

  • To develop and validate a novel technique, multi-tilt nanoparticle-aided cryo-electron microscopy sampling (MT-NACS), for observing heterogeneous protein conformations.
  • To apply MT-NACS to study the conformational flexibility of calmodulin and its interactions.

Main Methods:

  • Developed the MT-NACS technique utilizing nanoparticle labeling and multi-angle cryo-electron microscopy imaging.
  • Analyzed projected nanoparticle positions to determine 3D interparticle distance distributions.
  • Applied the technique to calmodulin, studying its structural changes upon Ca2+ binding, salt concentration changes, and interaction with amyloid-beta.

Main Results:

  • Successfully obtained distributions of 3D interparticle distances for small proteins.
  • Determined conformational changes in calmodulin related to Ca2+ binding and salt concentration.
  • Observed, for the first time experimentally, the structural changes during the interaction between amyloid-beta and calmodulin.

Conclusions:

  • The MT-NACS technique is effective for observing heterogeneous conformations of small proteins.
  • This method provides insights into the functional flexibility and dynamic structural changes of proteins.
  • MT-NACS offers a new platform for studying the structural dynamics of small proteins and their interactions.