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Author Spotlight: Enhancing CryoEM Sample Preparation Using Graphene Monolayer on Microscopy Grids
Published on: November 10, 2023
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Uniform thin ice on ultraflat graphene for high-resolution cryo-EM
Liming Zheng1,2, Nan Liu3, Xiaoyin Gao1
1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.
Nature Methods
|December 15, 2022
Summary
Ultraflat graphene (UFG) supports uniform thin ice for improved cryo-electron microscopy (cryo-EM) imaging. This method enhances image quality and enables high-resolution structural determination of macromolecules.
Area of Science:
- Structural Biology
- Biophysics
- Materials Science
Background:
- Cryo-electron microscopy (cryo-EM) requires vitrified specimens in thin ice for atomic resolution imaging.
- Homogeneous ice thickness is crucial for high-quality cryo-EM data but is difficult to control during specimen preparation.
- Current methods face challenges in achieving uniform ice thickness, limiting high-resolution cryo-EM applications.
Purpose of the Study:
- To investigate the relationship between supporting film surface flatness and thin ice uniformity in cryo-EM.
- To develop a novel specimen preparation method for improved control over vitreous ice thickness.
- To demonstrate the utility of ultraflat graphene (UFG) as a support for high-resolution cryo-EM.
Main Methods:
- Developed a cryo-EM specimen preparation technique utilizing ultraflat graphene (UFG) as a support film.
- Assessed ice thickness uniformity and image quality of vitrified specimens on UFG.
- Determined the 3D structures of hemoglobin, α-fetoprotein, and streptavidin using the UFG method.
Main Results:
- Uniform thin ice formation was achieved on UFG, directly correlating ice uniformity with surface flatness.
- Significantly improved image quality of vitrified specimens was observed on UFG supports.
- High-resolution 3D structures were determined for hemoglobin (3.5 Å), α-fetoprotein (2.6 Å), and streptavidin (2.2 Å).
Conclusions:
- Ultraflat graphene (UFG) provides superior control over vitreous ice thickness in cryo-EM specimen preparation.
- The UFG method enhances image quality, facilitating high-resolution structural determination of macromolecules.
- UFG holds significant potential for advancing cryo-electron tomography and structure-based drug discovery.
