Journal
JOURNAL OF ANTIBIOTICS
Volume 55, Issue 10, Pages 855-862Publisher
JAPAN ANTIBIOTICS RESEARCH ASSOC
DOI: 10.7164/antibiotics.55.855
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Six structurally related antitumor antibiotics named GEX1 compounds were isolated from a culture broth of Streptomyces sp. GEX1A was identified as a known herbicide, berboxidiene, structurally interested by the tetrahydropyran moiety and the side chain including a conjugated diene. GEX1Q1similar toQ5 were determined as novel compounds related to herboxidiene. All GEX1 compounds showed cytotoxicity with IC50 values of 0.0037similar to0.99 muM against human tumor cell lines in vitro, but were not active against both Gram-positive and -negative bacteria. Though GEX1A/herboxidiene exhibited antitumor activity in murine tumor-planted mouse models, both GEX1Q3 and GEX1Q5 did not.
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