Related Experiment Video
Updated: Aug 8, 2026
Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
Published on: February 21, 2016
Ultrastructural Identification and Colocalization of Interacting Proteins in the Murine Cochlea by Post-Embedding
Margaret C Harvey1, Bernd H A Sokolowski2
1Department of Otolaryngology-HNS, Morsani College of Medicine, University of South Florida, 12901 Bruce B. Downs Blvd., Tampa, FL, 33612, USA.
Insights
This study presents a method for precisely locating proteins within tissues using electron microscopy. The technique allows for nanometer-level resolution, enhancing our understanding of protein interactions at the cellular level.
Area of Science:
- Cell Biology
- Biochemistry
- Microscopy
Background:
- Protein localization and interaction studies are crucial for understanding cellular functions.
- Existing methods like western blotting and immunohistochemistry offer limited spatial resolution.
- Visualizing protein interactions at the ultrastructural level remains a challenge.
Purpose of the Study:
- To develop and present a method for high-resolution in situ protein immunolocalization using electron microscopy.
- To enable precise determination of protein locations within tissues at the nanometer scale.
Main Methods:
- Utilizing post-embedding immunolabeling on ultrathin tissue sections embedded in acrylic resin.
- Employing high-quality primary antibodies and small-particle-size gold-conjugated secondary antibodies.
- Performing ultrastructural localization with a high-resolution transmission electron microscope.
Main Results:
- Achieved protein localization with resolution capabilities within nanometers of the actual location.
- Demonstrated the effectiveness of the post-embedding technique for electron microscopic immunolocalization.
- Enabled visualization of protein interactions at the cellular level with unprecedented detail.
Conclusions:
- The described electron microscopic immunolocalization method provides precise spatial information on protein location and interaction.
- This technique significantly advances the ability to study molecular mechanisms within cells.
- Offers a powerful tool for researchers in cell biology and related fields.
Abstract:
Verification of the presence and location of a protein within tissue can be accomplished by western blotting and immunohistochemistry, using either paraffin or frozen sections. Affinity purification by reciprocal coimmunoprecipitations using the tissue of interest can demonstrate the existence of an interacting pair of proteins. Ultimately, the ability to visualize the interaction at the cellular level is desired. Precise location(s) of interacting proteins in situ can be accomplished by ultrastructural localization with high-quality primary antibodies and small-particle-size Au-conjugated secondary antibodies. Visualization can be obtained with a transmission electron microscope fitted with a high-resolution camera permitting magnifications that exceed 2 × 10(5), and, to date, resolution capability of 20+ Mpixels, thus enabling localization of the target protein to within nanometers of the actual location. Here, we report the method by which immunolocalization at the level of the electron microscope is accomplished using the post-embedding technique, i.e., performing antibody labeling of proteins on ultrathin sections of tissue embedded in acrylic resin.
