Abstract:
An acidic substance having a carboxyl group is produced by culturing in a medium a microorganism which has been modified to enhance expression of the ybjL gene, and collecting the acidic substance having a carboxyl group from the medium.
Abstract:
A method for producing an L-amino acid is described, for example L-threonine, L-lysine, L-histidine, L-phenylalanine, L-arginine, L-tryptophan, or L-glutamic acid, using a bacterium of the Enterobacteriaceae family, wherein the bacterium has been modified to enhance an activity of a wild-type alcohol dehydrogenase encoded by the adhE gene or a mutant alcohol dehydrogenase which is resistant to aerobic inactivation.
Abstract:
A medium component for more efficiently culturing a microorganism or microalga is provided. A nutrient additive useful in culturing a microorganism or microalga is produced by culturing a microalga in a medium to produce biomass derived from the microalga in the medium, adding an acid to the biomass to hydrolyze the biomass, and preparing the hydrolysate of the biomass as a nutrient additive.
Abstract:
A method for producing a protein is provided. An objective protein is produced by culturing in a culture medium Talaromyces cellulolyticus having an objective protein-producing ability, which has been modified so that the activity of a Pep4 protein is reduced.
Abstract:
A method for producing an L-amino acid is provided. An L-amino acid is produced by culturing a bacterium belonging to the family Enterobacteriaceae and having an L-amino acid-producing ability, wherein the bacterium has been modified so that the activity of aconitase is increased, or the activities of aconitase and acetaldehyde dehydrogenase are increased, in a medium, and collecting the L-amino acid from the medium or cells of the bacterium.
Abstract:
A method for producing an L-amino acid is provided. An L-amino acid is produced by culturing a bacterium belonging to the family Enterobacteriaceae and having an L-amino acid-producing ability, wherein the bacterium has been modified so that the activity of aconitase is increased, or the activities of aconitase and acetaldehyde dehydrogenase are increased, in a medium, and collecting the L-amino acid from the medium or cells of the bacterium.
Abstract:
An acidic substance having a carboxyl group is produced by culturing in a medium a microorganism which has been modified to enhance expression of the ybjL gene, and collecting the acidic substance having a carboxyl group from the medium.
Abstract:
A method for improving the thermostability of a protein includes introducing, into the protein, two or more amino acid substitutions selected from the group consisting of: (i) substitution of an arginine residue for a lysine residue, (ii) substitution of a threonine residue for a serine residue, and (iii) substitution of an alanine residue for a serine residue.
Abstract:
An L-amino acid is produced by culturing an Enterobacteriaceae which is able to produce an L-amino acid in a medium containing glycerol, especially crude glycerol, as the carbon source to produce and accumulate the L-amino acid in the culture, and collecting the L-amino acid from the culture.
Abstract:
A method for producing an L-amino acid includes culturing a bacterium which belongs to the family Enterobacteriaceae and has an L-amino acid-producing ability in a medium containing a carbon source selected from a fatty acid and an alcohol, and collecting the L-amino acid from the medium. A bacterium which has been subjected to a modification including at least one of enhancement of oxyS gene expression, enhancement of fixABC gene expression, and combination thereof, is used as the bacterium, or a substance that reduces intracellular hydrogen peroxide concentration of the bacterium is added to the medium.