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Gluconic acid production by Aspergillus terreus.
C Dowdells1, R L Jones, M Mattey
1beòcarta Ltd., Royal College Building, Glasgow, UK.
Letters in Applied Microbiology
|July 13, 2010
Summary
Aspergillus terreus efficiently converts glucose to gluconic acid, a valuable bulk chemical. This discovery reveals a new metabolic pathway and offers strategies for optimizing secondary metabolite production.
Area of Science:
- Microbiology
- Biochemistry
- Industrial Biotechnology
Background:
- Aspergillus terreus produces itaconic acid at low pH and secondary metabolites at higher pH.
- Investigating glucose utilization is key for optimizing metabolite production in A. terreus.
Purpose of the Study:
- To investigate glucose utilization by Aspergillus terreus for secondary metabolite production.
- To elucidate the glucose catabolism pathway in A. terreus.
Main Methods:
- Fermentation of A. terreus with glucose as the carbon source.
- Utilizing wild-type and genetically modified strains of A. terreus.
- Monitoring glucose metabolism and pH changes during fermentation.
Main Results:
- A. terreus rapidly metabolizes glucose to gluconic acid at pH 6.5.
- Gluconic acid is subsequently utilized as a carbon source after glucose depletion.
- A novel glucose catabolism pathway was identified in A. terreus.
Conclusions:
- A. terreus naturally produces gluconic acid with high molar conversion efficiency (up to 0.7 mol/mol).
- This organism is a potential novel producer of gluconic acid for industrial applications.
- Understanding glucose catabolism enables optimized fermentation strategies for secondary metabolite production via pH-controlled glucose feeding.
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