Generation of the cell factories for bio-based organic acid production through improvement of filamentous fungi by metabolic engineering

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For generation of cell factories for bio-based organic acid production, generation of strains showing high gene-targeting frequencies was performed in citric acid-producing Aspergillus niger. Novel type III polyketide synthase and some key enzymes, such as methylcitrate synthase and aconitate isomerase, in relation to the tricarboxylic acid cycle were examined through gene cloning and enzymatic characterization. There is some possibility that heterologous expression of genes encoding novel and specific enzymes in the citric acid-producing strains as hosts and improvement by metabolic engineering will open the way for generation of the cell factories for bio-based organic acid production.