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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.4K
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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Related Experiment Video

Updated: Aug 4, 2025

Author Spotlight: Enhancing CryoEM Sample Preparation Using Graphene Monolayer on Microscopy Grids
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Dual-Affinity Graphene Sheets for High-Resolution Cryo-Electron Microscopy.

Hang Cheng1,2,3,4, Liming Zheng5, Nan Liu1,2,6

  • 1Ministry of Education Key Laboratory of Protein Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|April 3, 2023
PubMed
Summary
This summary is machine-generated.

Dual-affinity graphene (DAG) supports cryo-electron microscopy (cryo-EM) sample preparation by preventing protein adsorption and improving particle orientation. This novel technique facilitates efficient high-resolution macromolecular structure determination.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Materials Science

Background:

  • Cryo-electron microscopy (cryo-EM) enables high-resolution macromolecular structure determination.
  • Specimen preparation challenges in cryo-EM include protein adsorption at the air-water interface and preferred particle orientation.
  • These issues hinder efficient three-dimensional (3D) reconstruction.

Purpose of the Study:

  • To develop an improved supporting material for cryo-EM sample preparation.
  • To overcome challenges associated with protein adsorption and orientation in vitreous ice.
  • To enhance the efficiency and robustness of cryo-EM structural determination.

Main Methods:

  • Exploration of dual-affinity graphene (DAG) as a cryo-EM support material.
  • DAG is modified with two distinct affinity ligands to bind specific sites on tagged protein particles.
  • Comparison of DAG with single-functionalized graphene using protein samples, including SARS-CoV-2 spike glycoprotein.

Main Results:

  • DAG demonstrated high binding specificity and affinity for target macromolecules.
  • DAG resulted in more balanced particle Euler angular distributions compared to single-functionalized graphene.
  • Prevention of protein particle adsorption at the air-water interface was observed.

Conclusions:

  • DAG grids offer a robust and generalizable technique for cryo-EM sample preparation.
  • This method facilitates facile and efficient 3D reconstruction for structural determination.
  • The DAG approach is anticipated to advance future cryo-EM studies.