protein phosphatase 2A

Ethoxysanguinarine (6-Ethoxydihydrosanguinarine) shows human blood acetylcholinesterase (HuAChE) and human plasma butyrylcholinesterase (HuBuChE) inhibitory activity, with IC50 values of 0.83 +/- 0.04 microM and 4.20 +/- 0.19 microM, respectively.

Calyculin A ((-)-Calyculin A), a toxicant in the Japanese marine sponge CDiscodermia calyxC, is a selective and potent inhibitor of protein phosphatase 1 (PP1) and protein phosphatase 2A (PP2A), inducing hyperactivation of cryopreserved bovine spermatozoa and inhibiting radiation-induced gammaH2AX DNA repair disease in human lymphocytes. gammaH2AX DNA repair foci in human lymphocytes.

N-Stearoylsphingosine (Cer(d18:1 18:0)) is an amide compound widely found in eukaryotic organisms that enhances protein phosphatase 2A (PP2A) activity by interfering with the binding of PP2A to PP2A inhibitor 2, leading to dephosphorylation of Akt.N-Stearoylsphingosine is used in prostate cancer research.

Cytostatin is a natural antitumor inhibitor of cell adhesion to extracellular matrix, blocking adhesion of B16 melanoma cells to laminin and collagen type IV in vitro (IC50s = 1.3 and 1.4 μg/ml, respectively) and B16 cells metastatic activity in mice. It induces apoptosis of FS3 mouse fibrosarcoma cells (IC50 = 3.1 μg/ml). Cytostatin potently and selectively inhibits protein phosphatase 2A (PP2A; IC50 = 29 nM against the catalytic subunit), while having no effect against PP1, PP2B, or PP5.

Motuporin is an inhibitor of type-1 and type-2A protein phosphatase catalytic subunits (PP-1c and PP-2Ac).