Abstract
Strain TP-A0248 which produces two new Cdc25B tyrosine phosphatase inhibitors and also possessing antifungal activity, designated nocardiones A (1) and B (2), was considered to belong to the genus Nocardia on the basis of literature comparison of chemotaxonomic properties. The nocardiones were isolated by solvent extraction of fermentation broth of Nocardia sp. TP-A0248 and purified by the conventional column chromatography. Spectroscopic studies led to determination that 1 and 2 belong to a class compound of naphtho[1,2-b]furan-4,5-diones. Compound 1 inhibited the activity of Cdc25B, PTP1B and FAP-1 protein tyrosine phosphatases at a concentration of 10 microM. It also showed moderate in vitro antifungal and cytotoxic activity.
MeSH terms
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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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Enzyme Inhibitors / chemistry
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Enzyme Inhibitors / isolation & purification*
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Enzyme Inhibitors / pharmacology
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Fermentation
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Furans / chemistry
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Furans / isolation & purification*
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Furans / pharmacology
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Humans
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Magnetic Resonance Spectroscopy
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Microbial Sensitivity Tests
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Molecular Structure
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Naphthoquinones / chemistry
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Naphthoquinones / isolation & purification*
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Naphthoquinones / pharmacology
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Nocardia
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Protein Tyrosine Phosphatases / antagonists & inhibitors
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Tumor Cells, Cultured / drug effects
Substances
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Antifungal Agents
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Enzyme Inhibitors
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Furans
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Naphthoquinones
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nocardione A
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nocardione B
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Protein Tyrosine Phosphatases