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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Updated: Sep 17, 2025

The CryoAPEX Method for Electron Microscopy Analysis of Membrane Protein Localization Within Ultrastructurally-Preserved Cells
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The CryoAPEX Method for Electron Microscopy Analysis of Membrane Protein Localization Within Ultrastructurally-Preserved Cells

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Cryo-Electron Microscopy-Based Epitope Mapping.

Ieva Drulyte1,2, Daniel L Hurdiss3

  • 1Materials and Structural Analysis, Thermo Fisher Scientific, Eindhoven, The Netherlands.

Methods in Molecular Biology (Clifton, N.J.)
|July 2, 2025
PubMed
Summary
This summary is machine-generated.

This chapter details a cryo-electron microscopy (cryo-EM) single-particle analysis (SPA) protocol for studying antigen-antibody interactions. It offers tips for examining these complexes, crucial for drug and vaccine development.

Keywords:
AntibodiesCryo-electron microscopyEpitope mappingEpitope-ParatopeProtein-protein interactionsSingle-particle analysisStructural biology

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Area of Science:

  • Structural Biology
  • Immunology
  • Biochemistry

Background:

  • Antibodies are key components of the adaptive immune system.
  • Antibody-antigen interactions are vital for therapeutics, vaccines, and understanding self/non-self-recognition.
  • Cryo-electron microscopy single-particle analysis (cryo-EM SPA) is a powerful tool for studying molecular interactions.

Purpose of the Study:

  • To provide a standardized protocol for examining antigen-antibody complexes using cryo-EM SPA.
  • To offer practical tips and tricks for successful cryo-EM SPA of these interactions.
  • To facilitate research in therapeutic antibody development and immunological studies.

Main Methods:

  • Cryo-electron microscopy single-particle analysis (cryo-EM SPA).
  • Detailed protocol development for antigen-antibody complex imaging.
  • Optimization strategies for data acquisition and processing.

Main Results:

  • A comprehensive and adaptable protocol for cryo-EM SPA of antigen-antibody complexes.
  • Identification of key parameters and potential pitfalls in the methodology.
  • Demonstration of the utility of cryo-EM SPA for structural elucidation of these interactions.

Conclusions:

  • Cryo-EM SPA is an effective method for characterizing antigen-antibody complexes at high resolution.
  • The provided protocol and tips can accelerate research in antibody-based therapeutics and diagnostics.
  • This work enhances the application of cryo-EM in structural immunology and drug discovery.