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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

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Published on: October 4, 2019

Novel microbial transformations of sclareolide.

Athar Ata¹, Leigha J Conci, Jordan Betteridge

¹Department of Chemistry, The University of Winnipeg, Winnipeg, MB Canada R3B 2E9. a.ata@uwinnipeg.ca

Chemical & Pharmaceutical Bulletin

|January 5, 2007

Summary

Fungal biotransformation of sclareolide yielded new hydroxylated derivatives. These compounds showed modest activity against acetylcholinesterase, suggesting potential for drug discovery.

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Area of Science:

Microbial Biotechnology
Natural Product Chemistry
Enzyme Catalysis

Background:

Sclareolide is a natural product with potential biological activities.
Microbial biotransformation is a powerful tool for generating novel chemical structures.
Exploring fungal metabolism can lead to the discovery of new bioactive compounds.

Purpose of the Study:

To investigate the fungal metabolism of sclareolide using various fungal strains.
To identify and characterize new sclareolide derivatives produced by microbial catalysis.
To evaluate the acetylcholinesterase inhibitory activity of the obtained metabolites.

Main Methods:

Incubation of sclareolide with selected fungal strains: Mucor plumbeus, Cunninghamella blakesleeana, Cunninghamella echinulata, Curvularia lunata, and Aspergillus niger.
Isolation and purification of metabolites using chromatographic techniques.
Structure elucidation of new compounds via spectroscopic methods (NMR, MS).
In vitro assay to determine acetylcholinesterase inhibitory activity.

Main Results:

Cunninghamella blakesleeana metabolized sclareolide to O(6)-sclareolide, 3beta,6alpha-dihydroxysclareolide, 9-hydroxysclareolide, and known metabolites.
Cunninghamella echinulata produced two new compounds, 5-hydroxysclareolide and 7beta-hydroxysclareolide, along with known derivatives.
Compounds 2-9 exhibited modest acetylcholinesterase inhibitory activity.

Conclusions:

Fungal biotransformation, particularly using Cunninghamella species, is effective for generating novel hydroxylated sclareolide derivatives.
The newly identified compounds possess potential for further development as acetylcholinesterase inhibitors.
This study expands the chemical diversity of sclareolide metabolites and highlights their pharmacological relevance.