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Related Experiment Video

Updated: Mar 23, 2026

Methylated DNA Immunoprecipitation

Methylated DNA Immunoprecipitation

Published on: January 2, 2009

A charge-suppressing strategy for probing protein methylation.

Zhibin Ning¹, Alexandra Therese Star¹, Anna Mierzwa¹

¹Ottawa Institute of Systems Biology, Department of Biochemistry, Immunology and Microbiology, Faculty of Medicine, University of Ottawa, Ontario, Canada. dfigeys@uottawa.ca.

Chemical Communications (Cambridge, England)

|March 30, 2016

Summary

Researchers developed a new antibody-free method to detect protein methylation on arginine and lysine residues. This chemical strategy enriches methylated peptides for mass spectrometry, advancing epigenetic research tools.

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Area of Science:

Biochemistry
Epigenetics
Proteomics

Background:

Protein methylation on arginine and lysine (RK) residues is crucial for gene expression regulation.
Current methods for studying RK methylation are limited, hindering research progress.

Purpose of the Study:

To develop a novel, antibody-free strategy for capturing and identifying methylated RK residues in proteins.
To overcome limitations of existing tools for probing protein methylation.

Main Methods:

A chemical approach was employed to eliminate charges on un-modified RK residues and peptide N-termini.
Peptides with methylated RK residues, retaining positive charges, were enriched using strong cation exchange chromatography.
High-resolution mass spectrometry was utilized for identification of enriched methylated peptides.

Main Results:

Successfully developed and validated an antibody-free method for detecting RK methylation.
The chemical modification and enrichment strategy effectively isolated methylated peptides.
High-resolution mass spectrometry enabled accurate identification of methylated RK sites.

Conclusions:

This novel strategy provides an effective and accessible tool for studying protein methylation.
The antibody-free approach facilitates research in epigenetics and gene expression regulation.
This method advances the field of proteomics by offering a new way to probe post-translational modifications.