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Updated: Jun 27, 2026

Imaging Glycans in Zebrafish Embryos by Metabolic Labeling and Bioorthogonal Click Chemistry

Imaging Glycans in Zebrafish Embryos by Metabolic Labeling and Bioorthogonal Click Chemistry

Published on: June 6, 2011

Molecular imaging enabled by bioorthogonal click labeling.

Katharina Götz¹, Marcel Streit¹, Patrick Eiring²

¹Rudolf Virchow Center, Research Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany.

Methods in Enzymology

|June 25, 2026

Summary

This summary is machine-generated.

This study introduces a new method for precise protein labeling using genetic code expansion and bioorthogonal click chemistry. This technique improves super-resolution microscopy by enabling high-density labeling with minimal error for molecular-scale imaging.

Keywords:

Bioorthogonal click chemistry Fluorescence imaging Genetic code expansion Noncanonical amino acids Site-specific labeling

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Area of Science:

Biochemistry
Molecular Biology
Microscopy

Background:

Efficient protein labeling is crucial for super-resolution fluorescence microscopy.
Current methods like antibodies and fluorescent proteins face steric hindrance, limiting labeling density and resolution.
Site-specific labeling with minimal linkage error is needed for molecular-scale imaging.

Purpose of the Study:

To develop a broadly applicable protocol for site-specific protein labeling.
To overcome limitations of existing labeling strategies in super-resolution microscopy.
To enable high-density, stoichiometric labeling for imaging proteins in their native cellular context.

Main Methods:

Utilized genetic code expansion to incorporate a strained alkene-modified noncanonical amino acid.
Employed bioorthogonal inverse electron-demand Diels-Alder click chemistry for labeling.
Developed a protocol for designing click sites, expressing mutants, selecting dyes, and optimizing conditions for mammalian cells.

Main Results:

Achieved rapid and selective covalent labeling with tetrazine-conjugated organic fluorophores.
Enabled attachment of small, bright dyes with minimal linkage error.
Demonstrated compatibility with both live-cell and fixed-cell imaging, including single-molecule localization microscopy.

Conclusions:

The described protocol provides a practical approach for site-specific protein labeling.
Supports high-density, stoichiometric labeling, enhancing achievable resolution in super-resolution microscopy.
Facilitates robust implementation across diverse protein classes and experimental systems for molecular-scale imaging.