6pvb
The structure of NTMT1 in complex with compound 6The structure of NTMT1 in complex with compound 6
Structural highlights
FunctionNTM1A_HUMAN Distributive alpha-N-methyltransferase that methylates the N-terminus of target proteins containing the N-terminal motif [Ala/Pro/Ser]-Pro-Lys when the initiator Met is cleaved. Specifically catalyzes mono-, di- or tri-methylation of exposed alpha-amino group of Ala or Ser residue in the [Ala/Ser]-Pro-Lys motif and mono- or di-methylation of Pro in the Pro-Pro-Lys motif. Some of the substrates may be primed by METTL11B-mediated monomethylation. Responsible for the N-terminal methylation of KLHL31, MYL2, MYL3, RB1, RCC1, RPL23A and SET. Required during mitosis for normal bipolar spindle formation and chromosome segregation via its action on RCC1.[1] [2] [3] Publication Abstract from PubMedThe bisubstrate analogue strategy is a promising approach to develop potent and selective inhibitors for protein methyltransferases. Herein, the interactions of a series of bisubstrate analogues with protein N-terminal methyltransferase 1 (NTMT1) were examined to probe the molecular properties of the active site of NTMT1. Our results indicate that a 2-C to 4-C atom linker enables its respective bisubstrate analogue to occupy both substrate- and cofactor-binding sites of NTMT1, but the bisubstrate analogue with a 5-C atom linker only interacts with the substrate-binding site and functions as a substrate. Furthermore, the 4-C atom linker is the optimal and produces the most potent inhibitor (Ki,app = 130 +/- 40 pM) for NTMT1 to date, displaying more than 3000-fold selectivity for other methyltransferases and even for its homologue NTMT2. This study reveals the molecular basis for the plasticity of the active site of NTMT1. Additionally, our study outlines general guidance on the development of bisubstrate inhibitors for any methyltransferases. Probing the Plasticity in the Active Site of Protein N-terminal Methyltransferase 1 Using Bisubstrate Analogues.,Chen D, Dong C, Dong G, Srinivasan K, Min J, Noinaj N, Huang R J Med Chem. 2020 Aug 13;63(15):8419-8431. doi: 10.1021/acs.jmedchem.0c00770. Epub, 2020 Jul 16. PMID:32605369[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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