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We isolated fluvirucin B2 from the culture broth of Streptomyces as an inhibitor of phosphatidylinositol-specific phospholipase C (PI-PLC). It inhibited PI-PLC of A431 cell cytosol with an IC50 of 1.6 micrograms/ml. Fluvirucin B2 also inhibited PI-PLC in cultured A431 cells, whereas it did not inhibit phosphatidylinositol synthesis and macromolecular synthesis markedly. It also inhibited epidermal growth factor-induced rapid rounding of A431 cells, in which PI turnover is involved.
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Ui et al. (1995) studied this question.
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