Genetic Incorporation of N(ε)-Formyllysine, a New Histone Post-translational Modification

Area of Science:

• Biochemistry
• Molecular Biology
• Epigenetics

Background:

• Lysine formylation is an emerging post-translational modification (PTM) found in histones and nuclear proteins.
• Its precise role in chromatin conformation and gene expression remains poorly understood.
• Current methods lack site-specific incorporation of N(ε)-formyllysine.

Purpose of the Study:

• To develop a general method for site-specific incorporation of N(ε)-formyllysine into proteins.
• To enable the investigation of lysine formylation's function in epigenetic regulation.

Main Methods:

• Utilized an orthogonal N(ε)-formyllysine aminoacyl-tRNA synthetase/tRNACUA pair.
• Achieved genetic incorporation of N(ε)-formyllysine in *Escherichia coli* and mammalian cells.

Main Results:

• Demonstrated highly efficient site-specific incorporation of N(ε)-formyllysine.
• Established a robust method for producing proteins with this unnatural amino acid.

Conclusions:

• The developed method provides a powerful tool for studying lysine formylation.
• Facilitates research into the role of this PTM in epigenetic mechanisms and gene regulation.