Patent ID: 8076111

Claim:
A method for producing succinic acid comprising: A) allowing a substance to act on an organic raw material in a reaction mixture containing carbonate ions, bicarbonate ions, or carbon dioxide gas, wherein the substance is selected from the group consisting of: i) a bacterium which has an ability to produce an organic acid and has been modified to have enhanced expression of the yidE gene, ii) a product obtained by processing the bacterium of i), iii) combinations thereof, and B) collecting the succinic acid: wherein the yidE gene is selected from the group consisting of: (a) a DNA comprising the nucleotide sequence of SEQ ID NO: 46, and (b) a DNA which hybridizes with a DNA comprising a nucleotide sequence complementary to the entire nucleotide sequence of SEQ ID NO: 46 under stringent conditions comprising washing with 1×SSC, 0.1% SDS at 60° C., and said DNA improves the ability of the bacterium to produce an organic acid when expression of the DNA is enhanced in the bacterium; wherein the enhanced expression is obtained by a method selected from the group consisting of: i) increasing the copy number of the yidE gene, ii) replacing a promoter sequence of the yidE gene with a stronger promoter, and iii) combinations thereof.