Deletion of glucose oxidase changes the pattern of organic acid production in Aspergillus carbonarius

作者：Yang Lei; Lubeck Mette; Lubeck Peter S^*

来源：AMB Express, 2014, 4(1): 54.

DOI：10.1186/s13568-014-0054-7

• Aspergillus carbonarius
• Citric acid
• Glucose oxidase
• Gluconic acid
• Malic acid

Aspergillus carbonarius has potential as a cell factory for the production of different organic acids. At pH 5.5, A. carbonarius accumulates high amounts of gluconic acid when it grows on glucose based medium whereas at low pH, it produces citric acid. The conversion of glucose to gluconic acid is carried out by secretion of the enzyme, glucose oxidase. In this work, the gene encoding glucose oxidase was identified and deleted from A. carbonarius with the aim of changing the carbon flux towards other organic acids. The effect of genetic engineering was examined by testing glucose oxidase deficient (Delta gox) mutants for the production of different organic acids in a defined production medium. The results obtained showed that the gluconic acid accumulation was completely inhibited and increased amounts of citric acid, oxalic acid and malic acid were observed in the Delta gox mutants.

• 出版日期2014-8-15