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Publication Abstract from PubMed

N-Acyl indolines 4 are potent, non-covalent Notum inhibitors developed from a covalent virtual screening hit 2a. The lead compounds were simple to synthesise, achieved excellent potency in a biochemical Notum-OPTS assay and restored Wnt signalling in a cell-based TCF/LEF reporter assay. Multiple high resolution X-ray structures established a common binding mode of these inhibitors with the indoline bound centred in the palmiteolate pocket with key interactions being aromatic stacking and a water mediated hydrogen bond to the oxyanion hole. These N-acyl indolines 4 will be useful tools for use in vitro studies to investigate the role of Notum in disease models, especially when paired with a structurally related covalent inhibitor (e.g. 4w and 2a). Overall, this study highlights the designed switch from covalent to non-covalent Notum inhibitors and so illustrates a complementary approach for hit generation and target inhibition.

Designed switch from covalent to non-covalent inhibitors of carboxylesterase Notum activity.,Atkinson BN, Willis NJ, Zhao Y, Patel C, Frew S, Costelloe K, Magno L, Svensson F, Jones EY, Fish PV Eur J Med Chem. 2023 May 5;251:115132. doi: 10.1016/j.ejmech.2023.115132. Epub , 2023 Jan 21. PMID:36934521^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.