L-amino acid producing bacterium

摘要

A method for producing an L-amino acid is described, for example, L-phenylalanine and L-histidine, by fermentation using a bacterium of the Enterobacteriaceae family, wherein the bacterium has been modified by attaching a DNA fragment able to be transcribed encoding the peptide represented in SEQ ID NO: 2, or a variant thereof, particularly a portion of the ssrA gene, to the 3′-end of gene encoding for the bacterial enzyme, which influences on the L-amino acid biosynthesis, such as chorismate mutase/prephenate dehydrogenase or phosphoglucose isomerase.

主权项

1. A recombinant L-amino acid producing Escherichia coli bacterium having a DNA comprising:
A) a gene selected from the group consisting of tyrA, pheA, pgi, ilvE, ilvA, tdcB, sdaA, sdaB, argA, argG, proB, thrB, and combinations thereof, and B) a DNA fragment able to be transcribed and encoding the peptide of SEQ ID NO: 2, or a variant thereof consisting of a deletion, insertion, substitution, or addition of 1 amino acid as compared to SEQ ID NO: 2, wherein said DNA fragment of B) is attached to the 3′ end of said gene of A) and consequently enhances production of an L-amino acid.