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Toxin Induction and Protein Extraction from Fusarium spp. Cultures for Proteomic Studies
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Metabolic activation and deactivation of fusarin C, a mutagen produced by Fusarium moniliforme

W C Gelderblom, P G Thiel, K J van der Merwe

    Biochemical Pharmacology
    |May 15, 1984
    PubMed

    Insights

    Fusarin C, a mutagen from Fusarium moniliforme, is activated by microsomal monooxygenase and deactivated by glutathione S-transferase. This study details the metabolic pathways of this fungal toxin.

    Area of Science:

    • * Mycology
    • * Toxicology
    • * Biochemistry

    Background:

    • * Fusarium moniliforme strain MRC 826 produces the mycotoxin fusarin C.
    • * Fusarin C is a known mutagen requiring metabolic activation.
    • * Understanding its metabolic fate is crucial for risk assessment.

    Purpose of the Study:

    • * To investigate the metabolic activation and deactivation pathways of fusarin C.
    • * To identify the enzymes involved in fusarin C metabolism.
    • * To characterize the mutagenicity of fusarin C using a bacterial assay.

    Main Methods:

    • * Salmonella typhimurium mutagenicity assay with tester strain TA 100.
    • * Use of phenobarbitone-induced microsomal monooxygenase for activation studies.
    • * Investigation of deactivation mechanisms involving thiol binding and enzymatic conjugation.

    Main Results:

    • * Microsomal monooxygenase, induced by phenobarbitone, activates fusarin C to a mutagenic form.
    • * Deactivation involves chemical binding to thiol groups.
    • * Cytosolic glutathione S-transferase mediates enzymatic conjugation for detoxification.

    Conclusions:

    • * Fusarin C metabolism is a two-step process involving activation and deactivation.
    • * Microsomal monooxygenase and glutathione S-transferase play key roles.
    • * The findings provide insight into the toxicological mechanisms of fusarin C.

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