Coscinosulfate, a CDC25 phosphatase inhibitor from the sponge Coscinoderma mathewsi.

Abstract The dual specificity CDC25 phosphatases dephosphorylate two inhibitory phospho-amino acids of cyclin-dependent kinases, a major family of cell cycle regulators. CDC25 inhibitors constitute new anti-mitotic agents with potential anticancer activity. While screening through a collection of natural products derived from marine organisms for CDC25A inhibitors, we purified and identified coscinosulfate 1 , a sesquiterpene sulfate from the New Caledonian sponge Coscinoderma matthewsi , along with 4 . The purified compound 1 displayed significant inhibitory activity towards CDC25A (IC 50 : 3 μM).