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Updated: Nov 22, 2025

Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level

Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level

Published on: April 19, 2019

Principles of Protein Labeling Techniques.

Christian Obermaier¹, Anja Griebel¹, Reiner Westermeier²

¹SERVA Electrophoresis GmbH, Heidelberg, Germany.

Methods in Molecular Biology (Clifton, N.J.)

|January 9, 2021

Summary

This summary is machine-generated.

Protein labeling is essential for proteomic profiling, using stable isotopes, mass tags, or fluorophores for enhanced detection and quantification in biological samples.

Keywords:

Difference gel electrophoresis Fluorescence imager Fluorophores Mass spectrometry Mass tags Protein detection Protein labeling Quantification Stable isotopes

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Area of Science:

Proteomics
Biochemistry
Analytical Chemistry

Background:

Protein labeling is crucial for advanced proteomic profiling.
Various tagging strategies are employed, including stable isotopes, mass tags, and fluorophores.
These methods enable detailed analysis of biological samples.

Purpose of the Study:

To review and describe protein labeling techniques for proteomic analysis.
To discuss the principles, modifications, benefits, and drawbacks of different labeling approaches.
To highlight the importance of labeling in monitoring biological processes and protein characteristics.

Main Methods:

Utilizing stable isotopes incorporated during cell growth.
Employing mass tags and fluorophores for post-translational modification analysis.
Chemical attachment of tags to specific amino acid residues (lysine, N-terminus, cysteine) or incorporation of labeled amino acids.

Main Results:

Stable isotopes and mass tags are detected via mass spectrometry.
Fluorophores are detected using fluorescence imagers.
Labeling facilitates multiplexed sample analysis, improved detection sensitivity, and simplified workflows.

Conclusions:

Protein labeling methods are indispensable tools in modern proteomics.
The choice of labeling strategy depends on the specific research question and analytical platform.
Understanding the principles and limitations of each method is key for successful proteomic profiling.