Exploiting an allosteric binding site of PRMT3 yields potent and selective inhibitors.

Abstract

Protein arginine methyltransferases (PRMTs) play an important role in diverse biological processes. Among the nine known human PRMTs, PRMT3 has been implicated in ribosomal biosynthesis via asymmetric dimethylation of the 40S ribosomal protein S2 and in cancer via interaction with the DAL-1 tumor suppressor protein. However, few selective inhibitors of PRMTs have been discovered. We recently disclosed the first selective PRMT3 inhibitor, which occupies a novel allosteric binding site and is noncompetitive with both the peptide substrate and cofactor. Here we report comprehensive structure-activity relationship studies of this series, which resulted in the discovery of multiple PRMT3 inhibitors with submicromolar potencies. An X-ray crystal structure of compound 14u in complex with PRMT3 confirmed that this inhibitor occupied the same allosteric binding site as our initial lead compound. These studies provide the first experimental evidence that potent and selective inhibitors can be created by exploiting the allosteric binding site of PRMT3.

• Authors: Feng Liu, Fengling Li, Anqi Ma, Elena Dobrovetsky, Aiping Dong, Cen Gao, Ilia Korboukh, Jing Liu, David Smil, Peter J Brown, Stephen V Frye, Cheryl H Arrowsmith, Matthieu Schapira, Masoud Vedadi, Jian Jin
• Journal: Journal of medicinal chemistry (J Med Chem) Vol. 56 Issue 5 Pg. 2110-24 (Mar 14 2013) ISSN: 1520-4804 [Electronic] United States
• PMID: 23445220 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Enzyme Inhibitors
• Ribosomal Proteins
• Thiadiazoles
• ribosomal protein S2
• benzo-1,2,3-thiadiazole
• PRMT3 protein, human
• Protein-Arginine N-Methyltransferases

Topics

• Allosteric Site (drug effects)
• Enzyme Inhibitors (chemical synthesis, pharmacology)
• Humans
• Inhibitory Concentration 50
• Protein-Arginine N-Methyltransferases (antagonists & inhibitors, chemistry)
• Ribosomal Proteins (metabolism)
• Structure-Activity Relationship
• Thiadiazoles (chemistry, pharmacology)
• X-Ray Diffraction