This toxin is a phosphate 1 A and 2A inhibitor and causes diarrhetic shellfish poisoning.
Okadaic acid is a potent inhibitor of protein phosphate-1 and 2A which leads to sodium secretion by intestinal cells and a profound secretory diarrhea. (Haystead TA et al. Effects of the tumour promoter okadaic acid on intracellular protein phosphorylation and metabolism. Nature 1989; Jan 5; 337 (6202): 78-81. doi: 10.1038/337078a0)
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