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Isolation and characterization of novel geldanamycin analogues.
Journal of Antibiotics 2004 July
New geldanamycin analogues with novel structures arising from direct microbial bioconversion and a genetically engineered geldanamycin producer were isolated and characterized. Three compounds, 15-hydroxygeldanamycin, a tricyclic geldanamycin analog (KOSN-1633), and methyl-geldanamycinate), were isolated after geldanamycin was added to a growing culture of the herbimycin producing strain-Streptomyces hygroscopicus AM-3672. Two related compounds, 17-formyl-17-demethoxy-18-O,-21-O-dihydrogeldanamycin and 17-hydroxymethyl-17-demethoxygeldanamycin were isolated from S. hygroscopicus NRRL 3602/pKOS279-78, a geldanamycin-producing strain containing various genes isolated from S. hygroscopicus AM-3672. Compared with geldanamycin, these five new compounds exhibited reduced cytotoxicity against SKBr3 cancer cells.
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