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Two new coumarins from Talaromyces flavus.

Jun-Wei He1, Da-Peng Qin1, Hao Gao1

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Two novel coumarins from Talaromyces flavus exhibit moderate activity against amyloid-beta 42 (Aβ42) aggregation. This study is the first to report Aβ42 inhibitory aggregation activity for coumarins.

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Area of Science:

  • Natural Product Chemistry
  • Mycology
  • Biochemistry

Background:

  • Soil-derived fungi are a rich source of novel bioactive compounds.
  • Coumarins are a diverse class of natural products with various biological activities.
  • Amyloid-beta 42 (Aβ42) aggregation is a key pathological hallmark of Alzheimer's disease.

Purpose of the Study:

  • To isolate and characterize new coumarins from the fungus Talaromyces flavus.
  • To evaluate the anti-Aβ42 aggregation, cytotoxic, and antimicrobial activities of the isolated compounds.

Main Methods:

  • Isolation of compounds using ethyl acetate extraction.
  • Structure elucidation via Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS).
  • Determination of absolute configurations using modified Mosher's method and circular dichroism (CD) spectroscopy.

Main Results:

  • Two new coumarins, talacoumarins A (1) and B (2), were identified.
  • Compounds 1 and 2 demonstrated moderate inhibitory activity against Aβ42 aggregation.
  • This marks the first report of Aβ42 aggregation inhibitory activity for coumarins.

Conclusions:

  • Talacoumarins A and B represent new additions to the coumarin chemical class.
  • The findings suggest potential therapeutic applications of coumarins in targeting Aβ42 aggregation.
  • Further research into the mechanism of action and structure-activity relationships is warranted.