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The production of alamethicins by Trichoderma spp
D Brewer1, F G Mason, A Taylor
1National Research Council of Canada, Atlantic Research Laboratory, Halifax, N.S.
Canadian Journal of Microbiology
|July 1, 1987
Summary
Researchers explored Trichoderma spp. for producing polypeptides rich in 2-methylalanine. Optimal yields were achieved using specific media components and fermentation conditions, yielding crystalline metabolites.
Area of Science:
- Microbiology
- Biochemistry
- Fermentation Technology
Background:
- Trichoderma species are known for producing various bioactive compounds.
- Polypeptides containing non-proteinogenic amino acids, such as 2-methylalanine, are of interest for their unique properties.
- Optimizing the production of these specific polypeptides requires understanding the influence of media composition and fermentation parameters.
Purpose of the Study:
- To investigate the production of polypeptides with a high percentage of 2-methylalanine residues by Trichoderma spp.
- To determine optimal fermentation conditions and media components for maximizing yields.
- To characterize the produced polypeptides and their physical and chemical properties.
Main Methods:
- Cultivation of Trichoderma spp. isolates on synthetic media with varying components.
- Optimization of fermentation parameters including temperature, pH, aeration, and nitrogen sources.
- Shake-flask and tank fermentation for metabolite production.
- Isolation and purification of target polypeptides.
- Characterization of physical and chemical properties of the purified metabolites.
Main Results:
- Good yields (0.5-1.0 g L-1) of 2-methylalanine-rich polypeptides were achieved using insoluble carbohydrates in synthetic media.
- A mixture of potassium nitrate, glutamine, and 2-methylalanine proved effective as a nitrogen source.
- Fermentation conditions (temperature, pH, age, aeration) significantly influenced the proportions of at least eight produced polypeptides.
- Specific conditions were identified to enhance the production of two key metabolites independently.
- Two target metabolites were successfully obtained in crystalline form, with their properties detailed.
Conclusions:
- Trichoderma spp. can be optimized for high-yield production of 2-methylalanine-rich polypeptides.
- Careful selection of media components and precise control of fermentation parameters are crucial for maximizing yields and directing metabolite profiles.
- The study provides a foundation for further research into the applications of these unique polypeptides.