Abstract:
There is provided a method for obtaining an L-amino acid or nucleic acid-producing bacterium belonging to the genus Escherichia with an optimized level of expression of the gene which influence on the distribution of carbon flow, such as sucAB genes, comprising the steps of introducing into chromosome of the bacterium a set of in vitro constructed DNA fragments containing regulatory element for the gene expression instead of the native element of regulatory region of the gene and selecting the colonies with increased L-amino acid productivity. Also there is provided a method for producing L-amino acid, such as L-glutamic acid, L-proline, L-arginine, L-glutamine, L-leucine, using the bacterium with optimized level of expression of the sucAB gene.
Abstract:
There is provided a method for obtaining an L-amino acid or nucleic acid-producing bacterium belonging to the genus Escherichia with an optimized level of expression of the gene which influence on the distribution of carbon flow, such as sucAB genes, comprising the steps of introducing into chromosome of the bacterium a set of in vitro constructed DNA fragments containing regulatory element for the gene expression instead of the native element of regulatory region of the gene and selecting the colonies with increased L-amino acid productivity. Also there is provided a method for producing L-amino acid, such as L-glutamic acid, L-proline, L-arginine, L-glutamine, L-leucine, using the bacterium with optimized level of expression of the sucAB gene.
Abstract:
There is disclosed a method for producing L-amino acid, for example L-threonine, L-lysine, L-histidine, L-phenylalanine, L-arginine or L-glutamic acid, using a bacterium of the Enterobacteriaceae family, wherein the bacterium has been modified to enhance an activity of D-xylose permease.
Abstract:
A method for producing L-amino acids, such as L-tryptophan, L-phenylalanine, and L-tyrosine, using a bacterium of the Enterobacteriaceae family is provided. The L-amino acid productivity of said bacterium is increased by enhancing an activity of 6-phosphogluconolactonase, which is encoded by the pgl gene (ybhE ORF).
Abstract:
The present invention provides a method for producing an L-amino acid using a bacterium of the Enterobacteriaceae family, particularly a bacterium belonging to genus Escherichia or Pantoea , which has been modified to attenuate expression of the sfmACDFH-fimZ cluster and/or the fimZ gene.
Abstract:
A method for producing L-amino acids, such as L-tryptophan, L-phenylalanine, and L-tyrosine, using a bacterium of the Enterobacteriaceae family is provided. The L-amino acid productivity of said bacterium is increased by enhancing an activity of 6-phosphogluconolactonase, which is encoded by the pgl gene (ybhE ORF).