Patent ID: 7368268

Claim:
A process for producing dicarboxylic acids selected from the group consisting of succinic acid, fumaric acid and malic acid, which comprises reacting a bacterium and saccharides in a reaction solution under the reducing state containing carbonate or bicarbonate ions or carbon dioxide gas therein, and collecting dicarboxylic acids produced in the reaction solution, wherein the bacterium is an aerobic Corynebacterium glutamicum R transformant wherein a) the endogenous lactate dehydrogenase gene is disrupted by a homologous recombination method with a plasmid and said Corynebacterium bacterium is transformed with b) the pyruvate carboxylase gene derived from Corynebacterium glutamicum R strain wherein said gene is overexpressed and wherein an oxidation-reduction potential of the reaction solution under the reducing state is −200 millivolts to −500 millivolts.