Okadaic Acid, Potassium Salt is a water-soluble analog of Okadaic Acid, isolated from cultured|Prorocentrum concavum|. The salt form is generated in aqueous potassium hydroxide methanol solution. The compound is a potent inhibitor of serine/threonine-specific protein phosphatases PP1, PP2A, 5534, PP2C and endogenous phosphatase smooth muscle myosin at IC|50|of 10-15 nM, 0.1 nM, 5 μM, >10 μM and 15-70 nM respectively. This inhibition action has been used to stimulate the activity of glucose transport and has been observed to block insulin's stimulation of glucose transport by inhibiting IRS-1 phosphorylation. Okadaic Acid, Potassium Salt has been used as a response modifier in the study of large granular lymphocyte and T-cell biochemistry. In addition to inhibitive activities it is a tumor promoter and has been used to study nitric oxide metabolism, apoptosis, cell cycle and calcium signaling.
Isolated from Prorocentrum concavum by preparative flash, medium pressure and high performance liquid chromatography. Salt form generated in aqueous potassium hydroxide-methanol solution.