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ABC99 is a Selective Irreversible Inhibitors of the Wnt-Deacylating Enzyme, ABC99 inhibited NOTUM with an IC50 value of 13 nM and showed excellent selectivity across the serine hydrolase family, as initially assessed by gel-based ABPP of soluble and membrane proteomes from SW620 cells. ABC99 preserves Wnt-mediated cell signaling in the presence of NOTUM and was also converted into an ABPP probe for visualizing NOTUM in native biological systems.

ABC99 is an N-hydroxyhydantoin (NHH) carbamate that selectively inhibits the Wnt-deacylating enzyme NOTUM (IC50=13 nM). ABC99 preserves Wnt3A signaling in the presence of NOTUM[1].

[1] Suciu RM, et al. Selective Irreversible Inhibitors of the Wnt-Deacylating Enzyme NOTUM Developed by Activity-Based Protein Profiling. ACS Med Chem Lett. 2018;9(6):563-568. DOI:10.1021/acsmedchemlett.8b00191