Patent ID: 8313933

Claim:
A method of producing an L-amino acid comprising culturing an L-amino acid-producing bacterium belonging to the Enterobacteriaceae family in a medium under microaerobic conditions, and collecting the L-amino acid from the medium or said bacterium, wherein said bacterium has been modified so that expression of yggG gene is enhanced as compared to a non-modified bacterium by a method selected from the group consisting of: a) increasing the copy number of the yggG gene, b) modifying an expression regulatory sequence of said gene, and c) combinations thereof; wherein said yggG gene is selected from the group consisting of: i) a DNA comprising the nucleotide sequence of SEQ ID NO: 1, and ii) a DNA that hybridizes with the nucleotide sequence that is complementary to SEQ ID NO: 1, or with a probe that is prepared from said nucleotide sequence, under stringent conditions comprising washing at 0.1×SSC, 0.1% SDS, at 60° C., and wherein said DNA enhances L-amino acid producing ability of a host bacterium when it is introduced into the host bacterium.