Abstract
A miniaturized 24-well plate microbioreactor approach was used to explore secondary metabolite media dependence in an Australian marine tunicate-associated fungus, Talaromyces sp. (CMB TU011). Detailed chemical investigations of an antifungal M1-saline cultivation yielded talarolide A (1), only the second reported natural cyclic peptide hydroxamate, and the first from a fungus. The antifungal properties of the M1-saline extract were attributed to the known diterpene glycoside sordarin (2). Structure elucidation of 1 and 2 was achieved by detailed spectroscopic analysis, with amino acid configurations in 1 assigned by the C3 and C18 Marfey's methods, and l-Ala and d-Ala regiochemistry by the recently reported 2D C3 Marfey's method.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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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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Cell Line
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Cell Survival / drug effects
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Diterpenes / chemistry
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Diterpenes / pharmacology
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Humans
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Hydroxamic Acids / chemistry*
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Hydroxamic Acids / isolation & purification
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Hydroxamic Acids / pharmacology
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Indenes / chemistry
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Indenes / pharmacology
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Peptides, Cyclic / chemistry*
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Peptides, Cyclic / isolation & purification
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Peptides, Cyclic / pharmacology
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Stereoisomerism
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Talaromyces / chemistry*
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Urochordata
Substances
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Anti-Bacterial Agents
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Antifungal Agents
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Diterpenes
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Hydroxamic Acids
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Indenes
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Peptides, Cyclic
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sordarin