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Microbial transformation of pyrethrosin.
1National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, Mississippi 38677, USA. amgalalv@yahoo.com
Journal of Natural Products
|August 25, 2001
Summary
Microbial transformation of pyrethrosin yielded a new eudesmanolide and known compounds. These natural products show promising cytotoxic, antifungal, and antiprotozoal activities.
Area of Science:
- Natural Product Chemistry
- Microbiology
- Medicinal Chemistry
Background:
- Germacranolides are a class of sesquiterpenoids with diverse biological activities.
- Microbial transformations are valuable tools for generating novel chemical entities from natural products.
Purpose of the Study:
- To investigate the microbial transformation of pyrethrosin using Rhizopus nigricans.
- To isolate and characterize new metabolites with potential therapeutic applications.
Main Methods:
- Microbial transformation of pyrethrosin (1) using Rhizopus nigricans NRRL 1477.
- Structure elucidation of isolated metabolites using 1D and 2D Nuclear Magnetic Resonance (NMR) analyses.
- Evaluation of biological activities including cytotoxicity, antifungal, and antiprotozoal assays.
Main Results:
- Isolation of a new eudesmanolide-type metabolite, 6 alpha-acetoxy-1 beta,4 alpha-dihydroxy-5,7 alpha H,8 beta H-eudesm-11 beta,13-dihydro-8,12-olide (5).
- Co-isolation of previously reported eudesmanolides (2, 3, 4, and 6).
- Demonstration of cytotoxic, antifungal, and antiprotozoal activities for the isolated metabolites.
Conclusions:
- Rhizopus nigricans NRRL 1477 effectively transforms pyrethrosin into novel and known eudesmanolides.
- The isolated eudesmanolides possess significant biological activities, highlighting their potential as leads for drug discovery.
- NMR spectroscopy is crucial for the structural determination of complex natural products.