Engineering of a peptide α-N-methyltransferase to methylate non-proteinogenic amino acids
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Introduction of α-N-methylated non-proteinogenic amino acids into peptides can improve their biological activities, membrane permeability and proteolytic stability. This is commonly achieved, in nature and in the lab, by assembling pre-methylated amino acids. The more appealing route of methylating amide bonds is challenging. Biology has evolved an α-N-automethylating enzyme, OphMA, which acts on the amide bonds of peptides fused to its C-terminus. Due to the ribosomal biosynthesis of its substrate, the activity of this enzyme towards peptides with non-proteinogenic amino acids has not been addressed. An engineered OphMA, intein-mediated protein ligation and solid-phase peptide synthesis have allowed us to demonstrate the methylation of amide bonds in the context of non-natural amides. This approach may have application in the biotechnological production of therapeutic peptides.
Song , H , Burton , A J , Shirran , S L , Fahrig-Kamarauskaitė , J , Kaspar , H , Muir , T W , Künzler , M & Naismith , J H 2021 , ' Engineering of a peptide α-N-methyltransferase to methylate non-proteinogenic amino acids ' , Angewandte Chemie International Edition , vol. Early View . https://doi.org/10.1002/anie.202100818
Angewandte Chemie International Edition
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