Structural highlights
FunctionNNMT_HUMAN Catalyzes the N-methylation of nicotinamide and other pyridines to form pyridinium ions. This activity is important for biotransformation of many drugs and xenobiotic compounds. Publication Abstract from PubMedNicotinamide N-methyltransferase (NNMT), which catalyzes the methylation of nicotinamide, is a cytosolic enzyme that has attracted much attention as a therapeutic target for a variety of diseases. However, despite the considerable interest in this target, reports of NNMT inhibitors have still been limited to date. In this work, utilizing in vitro translated macrocyclic peptide libraries, we identified peptide 1 as a novel class of NNMT inhibitors. Further exploration based on the X-ray cocrystal structures of the peptides with NNMT provided a dramatic improvement in inhibitory activity (peptide 23: IC(50) = 0.15 nM). Furthermore, by balance of the peptides' lipophilicity and biological activity, inhibitory activity against NNMT in cell-based assay was successfully achieved (peptide 26: cell-based IC(50) = 770 nM). These findings illuminate the potential of cyclic peptides as a relatively new drug discovery modality even for intracellular targets. Macrocyclic Peptides as a Novel Class of NNMT Inhibitors: A SAR Study Aimed at Inhibitory Activity in the Cell.,Hayashi K, Uehara S, Yamamoto S, Cary DR, Nishikawa J, Ueda T, Ozasa H, Mihara K, Yoshimura N, Kawai T, Ono T, Yamamoto S, Fumoto M, Mikamiyama H ACS Med Chem Lett. 2021 Jun 2;12(7):1093-1101. doi: , 10.1021/acsmedchemlett.1c00134. eCollection 2021 Jul 8. PMID:34267879[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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