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Lovastatin biosynthesis by Aspergillus terreus in a chemically defined medium
H Hajjaj1, P Niederberger, P Duboc
1Nestlé Research Center, Nestec Ltd., Vers-chez-les-Blanc, CH-1000 Lausanne 26, Switzerland. philippe.duboc@rdls.nestle.com
Applied and Environmental Microbiology
|May 26, 2001
Summary
This study optimized lovastatin production in Aspergillus terreus by identifying key carbon and nitrogen sources. Defined media with glucose and glutamate significantly enhanced lovastatin biosynthesis, showing potential for industrial applications.
Area of Science:
- Microbiology
- Biotechnology
- Biochemistry
Background:
- Lovastatin, a cholesterol-lowering drug, is a secondary metabolite produced by Aspergillus terreus.
- Optimizing lovastatin biosynthesis is crucial for efficient industrial production.
Purpose of the Study:
- To investigate the impact of various carbon and nitrogen sources on lovastatin production by A. terreus.
- To develop a chemically defined medium for enhanced lovastatin biosynthesis.
Main Methods:
- Culturing A. terreus in chemically defined media with different carbon (glucose, lactose) and nitrogen sources (glutamate, histidine).
- Monitoring lovastatin production in relation to nutrient consumption and availability.
- Comparing productivity in defined media versus complex media.
Main Results:
- Glutamate and histidine as nitrogen sources yielded the highest lovastatin levels.
- Lovastatin synthesis was triggered by glucose depletion and relief of glucose repression.
- Defined medium with glucose and glutamate resulted in a threefold increase in specific productivity compared to complex media.
Conclusions:
- Carbon source starvation and relief of glucose repression are essential for optimal lovastatin production.
- A defined medium using glucose and glutamate offers a more efficient system for lovastatin biosynthesis.
- Findings provide a basis for optimizing large-scale lovastatin fermentation.