Abstract
Calyculin A (1), isolated from the marine sponge Discodermia calyx, exhibits potent inhibitory activity against protein phosphatases PP1 and 2A. These enzymes are ubiquitously expressed in eukaryotes and catalyze the dephosphorylation of phosphorylated Ser/Thr residue. Considering the essential roles of PP1/2A in many aspects of cellular functions, fluorescence probe specific to these enzymes would be significant, but has not been reported so far. Therefore we launched a study to develop a fluorescence probe based on the specific inhibitor, 1.
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