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• W2161279260 abstract "A signal transduction pathway involving cAMP and protein kinase A (PKA) regulates aflatoxin accumulation and nor-1 and ver-1 (aflatoxin structural genes) promoter function in Aspergillus parasiticus by modulating expression of a key transcriptional activator, AflR. To understand the function of this pathway in greater detail we treated A. parasiticus in culture with wortmannin, a frequently used probe of phosphatidyl inositol (PI)-3 kinase activity. A. parasiticus D8D3 (nor-1::GUS reporter) and I4 (ver- ::GUS reporter) were grown on a defined solid growth medium (GMS agar) under aflatoxin-inducing conditions. GMS containing wortmannin (1 μM) reduced aflatoxin B1 accumulation up to 15-fold accompanied by a similarly large decrease in ver-1 and nor-1 promoter activity. Wortmannin inhibited growth (colony diameter) and asexual sporulation but to a much smaller extent. Wortmannin treatment increased intracellular cAMP levels up to 25-fold; total PKA activity also increased within 10 min of wortmannin exposure. These data support a regulatory model in which PI-3 kinase activity modulates intracellular cAMP accumulation and PKA activity. This in turn regulates AflR expression and activity, aflatoxin gene expression and aflatoxin accumulation." @default.
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• W2161279260 date "2007-07-01" @default.
• W2161279260 modified "2023-09-27" @default.
• W2161279260 title "Evidence that a wortmannin-sensitive signal transduction pathway regulates aflatoxin biosynthesis" @default.
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• W2161279260 doi "https://doi.org/10.3852/mycologia.99.4.562" @default.
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