Discovery of a First-in-Class Inhibitor of the PRMT5-Substrate Adaptor Interaction.
Journal
Journal of medicinal chemistry
ISSN: 1520-4804
Titre abrégé: J Med Chem
Pays: United States
ID NLM: 9716531
Informations de publication
Date de publication:
12 08 2021
12 08 2021
Historique:
pubmed:
4
8
2021
medline:
9
3
2022
entrez:
3
8
2021
Statut:
ppublish
Résumé
PRMT5 and its substrate adaptor proteins (SAPs), pICln and Riok1, are synthetic lethal dependencies in MTAP-deleted cancer cells. SAPs share a conserved PRMT5 binding motif (PBM) which mediates binding to a surface of PRMT5 distal to the catalytic site. This interaction is required for methylation of several PRMT5 substrates, including histone and spliceosome complexes. We screened for small molecule inhibitors of the PRMT5-PBM interaction and validated a compound series which binds to the PRMT5-PBM interface and directly inhibits binding of SAPs. Mode of action studies revealed the formation of a covalent bond between a halogenated pyridazinone group and cysteine 278 of PRMT5. Optimization of the starting hit produced a lead compound, BRD0639, which engages the target in cells, disrupts PRMT5-RIOK1 complexes, and reduces substrate methylation. BRD0639 is a first-in-class PBM-competitive inhibitor that can support studies of PBM-dependent PRMT5 activities and the development of novel PRMT5 inhibitors that selectively target these functions.
Identifiants
pubmed: 34342224
doi: 10.1021/acs.jmedchem.1c00507
pmc: PMC9036822
mid: NIHMS1786730
doi:
Substances chimiques
Adaptor Proteins, Signal Transducing
0
Pyridazines
0
PRMT5 protein, human
EC 2.1.1.319
Protein-Arginine N-Methyltransferases
EC 2.1.1.319
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
11148-11168Subventions
Organisme : NCI NIH HHS
ID : R01 CA233626
Pays : United States
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