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Gluconic acid production by Aspergillus terreusDowdells, C. ...Aim: Aspergillus terreus produces itaconic acid at low pH but lovastatin and other secondary metabolites at higher pH in the fermentation. The utilization of glucose as a carbon substrate was ... investigated for secondary metabolite production by A. terreus. Methods and Results: With a starting pH of 6.5, glucose was rapidly metabolized to gluconic acid by the wild-type strain and by transformants harbouring Aspergillus niger genes encoding 6-phosphofructo-1-kinases with superior kinetic and regulatory properties for bioproduction of metabolites from glucose. On exhaustion of the glucose in batch fermentations, the accumulated gluconic acid was utilized as a carbon source. Conclusions: A novel pathway of glucose catabolism was demonstrated in A. terreus, a species whose wild type is, without any strain development, capable of producing gluconic acid at high molar conversion efficiency (up to 0.7 mol mol [sub]-1 glucose consumed). Significance and Impact of the Study: Aspergillus terreus is a potential novel producer organism for gluconic acid, a compound with many uses as a bulk chemical. With a new knowledge of glucose catabolism by A. terreus, fermentation strategies for secondary metabolite production can be devised with glucose feeding using feedback regulation by pH.Source: Letters in applied microbiology. - ISSN 0266-8254 (Vol. 51, issue 3, 2010, str. 252-257)Type of material - article, component partPublish date - 2010Language - englishCOBISS.SI-ID - 4452634
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Database name | Field | Year |
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Dowdells, C. | |
Jones, R. L. | |
Mattey, Michael | |
Benčina, Mojca, 1968- | 14360 |
Legiša, Matic | 09354 |
Mousdale, David M. |
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