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Related Experiment Videos

Microbial transformations of isosteviol.

Feng-Lin Hsu1, Chia-Chung Hou, Li-Ming Yang

  • 1Graduate Institute of Pharmaceutical Sciences, Taipei Medical University, Taipei, Taiwan 110, Republic of China.

Journal of Natural Products
|March 23, 2002
PubMed
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Microbial metabolism of isosteviol yielded five new compounds and three known ones. These metabolites showed reduced antihypertensive activity compared to the parent compound.

Area of Science:

  • Natural Product Chemistry
  • Microbial Biotechnology
  • Pharmacology

Background:

  • Isosteviol, a tetracyclic diterpenoid, undergoes microbial transformations.
  • Understanding these biotransformations can lead to novel compound discovery.

Purpose of the Study:

  • To identify new metabolites of isosteviol produced by microbial fermentation.
  • To evaluate the antihypertensive activity of the resulting metabolites.

Main Methods:

  • Microbial fermentation of isosteviol using Cunninghamella bainieri, Actinoplanes sp., Mucor recurvatus, and Cunninghamella blakesleeana.
  • Structure elucidation of new metabolites using HRFABMS and 1D/2D NMR spectroscopy.
  • In vitro testing of metabolites for antihypertensive activity.

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Main Results:

  • Five new isosteviol metabolites were identified: ent-11alpha,12alpha-dihydroxy-16-ketobeyeran-19-oic acid (5), ent-11alpha,12alpha,17-trihydroxy-16-ketobeyeran-19-oic acid (6), ent-12alpha,15alpha-dihydroxy-16-ketobeyeran-19-oic acid (7), ent-7alpha,15alpha-dihydroxy-16-ketobeyeran-19-oic acid (8), and ent-9alpha-hydroxy-16-ketobeyeran-19-oic acid (9).
  • Three known metabolites were also isolated: ent-7alpha-hydroxy-16-ketobeyeran-19-oic acid (3), ent-7beta-hydroxy-16-ketobeyeran-19-oic acid (4), and ent-12alpha-hydroxy-16-ketobeyeran-19-oic acid (10).
  • All tested metabolites (3-10) exhibited lower antihypertensive activity than the parent compound, isosteviol (2).

Conclusions:

  • Microbial metabolism of isosteviol generates a diverse range of hydroxylated derivatives.
  • The identified metabolites possess reduced antihypertensive potential compared to isosteviol.
  • This study expands the known metabolic pathways of isosteviol and provides insights into structure-activity relationships.