Abstract
Protein α-N-terminal (Nα) methylation is a post-translational modification catalyzed by N-terminal methyltransferase 1/2 (NTMT1/2) and METTL13. Nα methylation affects protein stability, protein-protein interaction, and protein-DNA interaction. Thus, Nα methylated peptides are essential tools to study the function of Nα methylation, generate specific antibodies for different states of Nα methylation, and characterize the enzyme kinetics and activity. Here, we describe chemical methods of site-specific synthesis of Nα mono-, di-, and trimethylated peptides in the solid phase. In addition, we describethe preparation of trimethylation peptides by recombinant NTMT1 catalysis.
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