Abstract
(-)-Phenylahistin, a fungal diketopiperazine metabolite composed of phenylalanine and isoprenylated dehydrohistidine, arrested cells in mitosis and inhibited the proliferation of A549 cells. The microtubule network in A549 cells was disrupted by (-)-phenylahistin, which also inhibited the polymerization of both microtubule protein from bovine brain and phosphocellulose-purified tubulin in vitro. Competitive binding studies indicated that (-)-phenylahistin interacted with the colchicine binding site on tubulin but not with the vinblastine binding site.
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