3BrB-PP1 is an ATP-competitive analog that exhibits specific inhibitory activity towards protein kinase. It is effective in inhibiting protein kinase with mutations in the ATP-binding pocket, specifically the mutation of Thr97 within Sty1's ATP-binding pocket.
Tautomycin is a potent and specific protein phosphatases 1 and 2A inhibitor (Kiapp of 0.16 nM and 0.4 nM for PP1 and PP2A, respectively), and is an antifungal antibiotic isolated from the bacterium Streptomyces verticillatus.