Abstract
[structure] Organic extracts from cultures of endophytic fungi collected in the Guanacaste Conservation Area of Costa Rica were screened for antibiotic activity. Two endophytes CR200 (Cytospora sp.) and CR146 (Diaporthe sp.) were found to have potent antibiotic activity. Bioassay-guided fractionation of the extracts from these fungi led to the identification of cytosporones D and E, antibacterial active trihydroxybenzene lactones, and three related but inactive metabolites. The five new octaketides were characterized using X-ray crystallography and NMR.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Anti-Bacterial Agents / chemistry
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Anti-Bacterial Agents / isolation & purification*
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Anti-Bacterial Agents / pharmacology
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Antifungal Agents / chemistry
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Antifungal Agents / isolation & purification
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Antifungal Agents / pharmacology
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Bacteria / drug effects
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Benzopyrans / chemistry
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Benzopyrans / isolation & purification*
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Benzopyrans / pharmacology
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Crystallography, X-Ray
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Fermentation
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Lactones / chemistry
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Lactones / isolation & purification*
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Lactones / pharmacology
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Magnetic Resonance Spectroscopy
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Microbial Sensitivity Tests
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Mitosporic Fungi / chemistry
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Mitosporic Fungi / metabolism*
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Models, Molecular
Substances
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Anti-Bacterial Agents
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Antifungal Agents
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Benzopyrans
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Lactones