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Related Experiment Videos

Microbial transformation studies on arteannuin B.

S A Elmarakby1, F S el-Feraly, H N Elsohly

  • 1Department of Pharmacognosy, University of Mississippi, University 38677.

Journal of Natural Products
|September 1, 1987
PubMed
Summary
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Microbial transformation of sesquiterpene lactone arreannuin B using Aspergillus flavipes yielded dihydroarteannuin B. Further fermentation with Beauveria bassiana produced novel hydroxy metabolites, expanding knowledge of sesquiterpene chemistry.

Area of Science:

  • Natural Product Chemistry
  • Microbial Biotechnology
  • Organic Synthesis

Background:

  • Sesquiterpene lactones are a diverse class of natural products with significant biological activities.
  • Artemisinin derivatives, like arreannuin B, are crucial in antimalarial drug development.
  • Understanding microbial transformations can lead to novel compound discovery and synthetic routes.

Purpose of the Study:

  • To investigate the microbial transformation of arreannuin B using different fungal strains.
  • To identify and characterize new metabolites derived from arreannuin B.
  • To explore chemical synthesis of related isomers for structural elucidation.

Main Methods:

  • Microbial fermentation of arreannuin B using Aspergillus flavipes and Beauveria bassiana.

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  • Isolation and purification of transformation products.
  • Structure elucidation using advanced spectroscopic techniques (1D and 2D NMR) and chemical methods.
  • Chemical synthesis of isomeric compounds.

    • Main Results:

    • Aspergillus flavipes transformed arreannuin B into dihydroarteannuin B.
    • Beauveria bassiana fermentation yielded two new compounds: 3 beta-hydroxyarteannuin B and 13-hydroxy-11-epi-dihydroarteannuin B.
    • Full 1H and 13C NMR assignments were completed for all synthesized and isolated compounds.
    • Chemical synthesis provided 11-epi-dihydroarteannuin B and an isomer of arteannuin B.

    Conclusions:

    • Microbial biotransformation is a viable strategy for generating novel sesquiterpene lactone derivatives.
    • The identified metabolites represent new chemical entities with potential for further investigation.
    • Comprehensive NMR analysis confirmed the structures of these new compounds and their isomers.
    • This study expands the chemical diversity of arreannuin B derivatives through both microbial and chemical approaches.