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Publication Abstract from PubMed

NOTUM is a carboxylesterase that has been shown to act by mediating the O-depalmitoleoylation of Wnt proteins resulting in suppression of Wnt signaling. Here, we describe the development of NOTUM inhibitors that restore Wnt signaling for use in in vitro disease models where NOTUM over activity is an underlying cause. A crystallographic fragment screen with NOTUM identified 2-phenoxyacetamide 3 as binding in the palmitoleate pocket with modest inhibition activity (IC(50) 33 muM). Optimization of hit 3 by SAR studies guided by SBDD identified indazole 38 (IC(50) 0.032 muM) and isoquinoline 45 (IC(50) 0.085 muM) as potent inhibitors of NOTUM. The binding of 45 to NOTUM was rationalized through an X-ray co-crystal structure determination which showed a flipped binding orientation compared to 3. However, it was not possible to combine NOTUM inhibition activity with metabolic stability as the majority of the compounds tested were rapidly metabolized in an NADPH-independent manner.

Discovery of 2-phenoxyacetamides as inhibitors of the Wnt-depalmitoleating enzyme NOTUM from an X-ray fragment screen.,Atkinson BN, Steadman D, Zhao Y, Sipthorp J, Vecchia L, Ruza RR, Jeganathan F, Lines G, Frew S, Monaghan A, Kjaer S, Bictash M, Jones EY, Fish PV Medchemcomm. 2019 Apr 29;10(8):1361-1369. doi: 10.1039/c9md00096h. eCollection , 2019 Aug 1. PMID:31534655^[1]

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