PP2A-B56-β Inhibitors

The chemical class of PP2A-B56-β (PPP2R5B) inhibitors primarily consists of compounds that inhibit the PP2A complex, thereby indirectly affecting the regulatory role of the PP2A-B56-β subunit. These inhibitors modulate the function of PP2A, a crucial phosphatase in various signaling pathways, thereby influencing cellular processes regulated by PP2A-B56-β. Compounds such as Okadaic Acid, Cantharidin, Fostriecin, Calyculin A, LB-100, and Endothall are well-known inhibitors of PP2A. Their mode of action typically involves binding to the catalytic subunit of PP2A, thereby inhibiting its activity. This inhibition can indirectly affect the regulatory function of PP2A-B56-β, which is part of the PP2A complex. For example, Okadaic Acid, a potent PP2A inhibitor, could impact the PP2A-B56-β subunit by disrupting the overall phosphatase activity of the PP2A complex.

Additionally, Tautomycin, Rubratoxin B, Microcystin-LR, Phenothiazines, Bithionol, and Perphenazine are part of this chemical class due to their PP2A inhibitory activity. These compounds, through their interaction with PP2A, potentially influence the regulatory role of PP2A-B56-β in cellular processes like cell growth, apoptosis, and DNA damage response. For instance, Microcystin-LR and Tautomycin, by inhibiting PP2A, could indirectly modulate the activity of the PP2A-B56-β subunit.