Abstract
A new antibiotic compound, gephyronic acid was isolated from the culture broth of the myxobacterium, Archangium gephyra strain Ar 3895. Up to 3 mg/liter was produced during the logarithmic and stationary growth phase. The compound is an aliphatic acid, which tends to form a hemiacetal. Both forms inhibited growth of yeasts and molds (MIC 1-25 micrograms/ml) and had a cytostatic effect on mammalian cell cultures (IC50 10-60 ng/ml). Gephyronic acid is a specific inhibitor of eukaryotic protein synthesis showing an IC50 of 1-2 x 10(-7) mol/liter in an in vitro translation assay.
MeSH terms
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Animals
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Antifungal Agents / biosynthesis
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Antifungal Agents / chemistry*
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Antifungal Agents / pharmacology*
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Cell Division / drug effects
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Chemical Phenomena
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Chemistry, Physical
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Fatty Acids, Monounsaturated / chemistry
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Fatty Acids, Monounsaturated / metabolism
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Fatty Acids, Monounsaturated / pharmacology
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Fibroblasts / drug effects
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Fibroblasts / metabolism
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Humans
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Leukemia, Experimental / drug therapy
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Leukemia, Experimental / metabolism
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Mice
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Myxococcales / chemistry*
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Myxococcales / metabolism*
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Protein Biosynthesis* / drug effects
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Proteins / drug effects*
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Rabbits
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Tumor Cells, Cultured
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Yeasts / drug effects
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Yeasts / metabolism
Substances
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Antifungal Agents
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Fatty Acids, Monounsaturated
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Proteins
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gephyronic acid