NRX-103094 is a potent enhancer of the interaction between β-catenin, and its cognate E3 ligase, SCFβ-TrCP. NRX-103094 enhances the binding of pSer33/Ser37 β-catenin peptide for β-TrCP with an EC50 of 62 nM and a Kd of 0.6 nM[1].
NRX-103094 shows high potency with pSer33/Ser37 β-catenin peptide (EC50 of 457 nM). NRX-103094 potentiates the ubiquitylation of pSer33/S37A β-catenin peptide to levels greater than wild-type pSer33/pSer37 levels at 250 nM[1].
NRX-103094 enhances the S33E/S37A phosphomimetic peptide binding affinity for β-TrCP from >5 μM in the absence of compound to 22 nM in the presence of 40 μM compound. In the presence of 20 μM NRX-103094, robust time-dependent ubiquitylation of S33E/S37A β-catenin peptide is observed. Likewise, the full-length S33E/S37A β-catenin protein is strongly ubiquitylated in the presence of 20 μM NRX-103094, with the ubiquitylation levels approaching that of WT full-length β-catenin protein[1].
[1]. Kyle R Simonetta, et al. Prospective discovery of small molecule enhancers of an E3 ligase-substrate interaction. Nat Commun. 2019 Mar 29;10(1):1402.