Notum Protein serves as a crucial negative regulator of the Wnt signaling pathway, playing a specific role in mediating the depalmitoleoylation of WNT proteins. The process of serine palmitoleoylation of WNT proteins is essential for their efficient binding to frizzled receptors, and Notums carboxylesterase activity is instrumental in modulating this aspect of the Wnt signaling cascade. Notum Protein, Human (C330S, CHO, His) is the recombinant human-derived Notum protein, expressed by CHO , with C-His labeled tag.