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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.3K
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...
3.3K

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Updated: Jul 11, 2025

Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block
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Theoretical framework and experimental solution for the air-water interface adsorption problem in cryoEM.

Joon S Kang, Xueting Zhou, Yun-Tao Liu

    Biorxiv : the Preprint Server for Biology
    |November 14, 2023
    PubMed
    Summary

    Cryo-electron microscopy (cryoEM) struggles with particle loss due to air-water interface (AWI) adsorption. This study explains particle migration to the AWI and demonstrates surfactants as a practical solution for high-resolution cryoEM.

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    Last Updated: Jul 11, 2025

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    Area of Science:

    • Structural Biology
    • Biophysics

    Background:

    • Cryo-electron microscopy (cryoEM) is a powerful technique for determining atomic structures of biological complexes.
    • Particle loss and preferential orientation on cryoEM grids limit high-resolution structure determination.
    • The underlying reasons for poor particle behavior on cryoEM grids are not well understood.

    Approach:

    • Developed a theoretical formulation predicting particle migration to the air-water interface (AWI) to minimize surface energy.
    • Utilized cryogenic electron tomography (cryoET) with GroEL to observe particle distribution in standard buffer and with varying surfactant concentrations.
    • Employed single-particle cryoEM to assess the impact of surfactants on biological complex integrity.

    Key Points:

    • Particles preferentially migrate to the AWI in standard buffer solutions, driven by surface energy minimization.
    • Reducing surface tension with surfactants significantly decreases particle accumulation at the AWI.
    • Applicable surfactants do not compromise the structural integrity of biological complexes.

    Conclusions:

    • Surfactants offer a practical, simple, and generalizable solution to mitigate AWI adsorption in cryoEM.
    • This approach enabled the first near-atomic structure of the ClC-1 channel membrane protein using cryoEM.