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Site-Specific Lysine Lactylation via Genetic Code Expansion in E. coli and Mammalian Cells
Published on: February 24, 2026
A method to site-specifically introduce methyllysine into proteins in E. coli.
Hui-Wang Ai1, Jae Wook Lee, Peter G Schultz
1Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.
Chemical Communications (Cambridge, England)
|June 24, 2010
Summary
Researchers genetically encoded a novel amino acid in bacteria, which can be converted to methyllysine. This offers a simple method for site-specific protein modification with methyllysine residues.
Area of Science:
- Biochemistry
- Synthetic Biology
- Protein Engineering
Background:
- Site-specific incorporation of non-canonical amino acids (ncAAs) into proteins is crucial for expanding protein functionality.
- Lysine methylation is an important post-translational modification involved in various cellular processes.
Purpose of the Study:
- To develop a straightforward method for site-specific introduction of methyllysine residues into proteins using genetic encoding.
- To establish a bacterial system for producing proteins with site-specific methyllysine.
Main Methods:
- Utilized a mutant pyrrolysyl-tRNA synthetase/tRNA pair for the genetic encoding of allylcarbamoyl methyllysine in bacteria.
- Employed a ruthenium catalyst for the in situ conversion of the encoded allylcarbamoyl methyllysine to methyllysine.
Main Results:
- Successfully demonstrated the genetic encoding of allylcarbamoyl methyllysine in a bacterial system.
- Validated the efficient conversion of the encoded amino acid to methyllysine using a ruthenium catalyst.
- Showcased the site-specific introduction of methyllysine residues into target proteins.
Conclusions:
- The developed system provides a facile and efficient approach for site-specific protein methylation.
- This method expands the toolkit for protein engineering and the study of lysine methylation.
- Opens avenues for creating novel proteins with tailored biochemical properties.
