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Inhibition of Aspergillus flavus Growth and Aflatoxin Production in Transgenic Maize Expressing the α-amylase Inhibitor from Lablab purpureus L.
09:21

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A possible role for exocytosis in aflatoxin export in Aspergillus parasiticus

Anindya Chanda1, Ludmila V Roze, John E Linz

  • 1Department of Food Science and Human Nutrition, Michigan State University, East Lansing, 48824, USA.

Eukaryotic Cell
|September 28, 2010
PubMed

Insights

Filamentous fungi export harmful aflatoxins via exocytosis. Specialized vesicles called aflatoxisomes fuse with the cell membrane, releasing aflatoxin into the environment.

Area of Science:

  • Mycology
  • Cell Biology
  • Biochemistry

Background:

  • Filamentous fungi produce secondary metabolites with significant health and economic impacts.
  • The export mechanisms for these fungal metabolites remain largely uncharacterized.
  • Aspergillus parasiticus produces aflatoxin, a potent carcinogen, with unknown export pathways.

Purpose of the Study:

  • To investigate the export mechanism of aflatoxin in Aspergillus parasiticus.
  • To test the hypothesis that aflatoxisomes mediate aflatoxin export through fusion with the plasma membrane.

Main Methods:

  • Microscopic analysis of Aspergillus parasiticus.
  • Comparison of fungal cells grown under aflatoxin-inducing and non-inducing conditions.

Main Results:

  • Experimental evidence supports the hypothesis that aflatoxisomes are involved in aflatoxin export.
  • Microscopic observations indicate fusion of aflatoxisomes with the cytoplasmic membrane.
  • These findings suggest a role for specialized vesicles in mycotoxin secretion.

Conclusions:

  • Aflatoxin export in Aspergillus parasiticus occurs via exocytosis.
  • A proposed model illustrates the exocytosis mechanism involving aflatoxisomes.
  • Understanding this pathway is crucial for controlling aflatoxin contamination.

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