A method for producing a rich taste imparting substance-containing yeast, where the method includes: a yeast proliferating step of culturing a yeast that is modified to have a reduced acetolactate synthase activity in cells, and has isoleucine and valine requirements in a culture medium containing isoleucine and valine, to proliferate the yeast; and a rich taste imparting substance producing step of culturing the yeast with addition of valine to the culture medium when an isoleucine content in the culture medium is less than 0.2% by mass, to produce a rich taste imparting substance, wherein the rich taste imparting substance is at least one of ?-Glu-Abu and ?-Glu-Abu-Gly.

Engineered polypeptides or engineered microbial cells useful in synthesizing acyl amino acids are provided. In some embodiments, engineered polypeptides or engineered microbial cells are useful in synthesizing acyl amino acids with one or more hydroxyl and/or methyl groups at one or more positions of the fatty acid portion of the acyl amino acid (e.g., at -1, -2, and/or -3 positions of the fatty acid portion of the acyl amino acid). Also provided are methods of making acyl amino acids using engineered polypeptides and/or engineered microbial cells.

Engineered polypeptides or engineered microbial cells useful in synthesizing acyl amino acids are provided. In some embodiments, engineered polypeptides or engineered microbial cells are useful in synthesizing acyl amino acids with one or more hydroxyl and/or methyl groups at one or more positions of the fatty acid portion of the acyl amino acid (e.g., at -1, -2, and/or -3 positions of the fatty acid portion of the acyl amino acid). Also provided are methods of making acyl amino acids using engineered polypeptides and/or engineered microbial cells.

Provided are a Corynebacterium glutamicum mutant that is resistant to high concentrations of L-glutamine, and a method of producing L-glutamine by using the mutant.

Provided are a Corynebacterium glutamicum mutant that is resistant to high concentrations of L-glutamine, and a method of producing L-glutamine by using the mutant.

The disclosure relates to a metabolic transistor in microbes such as bacteria and yeast where a competitive pathway is introduced to compete with a product pathway for available carbon so as to control the carbon flux in the microbe.

The disclosure relates to a metabolic transistor in microbes such as bacteria and yeast where a competitive pathway is introduced to compete with a product pathway for available carbon so as to control the carbon flux in the microbe.

Yeast and a yeast extract with a high content of Abu, -Glu-Abu, and/or -Glu-Abu-Gly are provided. By modifying yeast so that intracellular acetolactate synthase activity is reduced, yeast with a high content of Abu, -Glu-Abu, and/or -Glu-Abu-Gly is obtained. An yeast extract is prepared by using the yeast obtained in such a manner as a raw material.

Yeast and a yeast extract with a high content of Abu, -Glu-Abu, and/or -Glu-Abu-Gly are provided. By modifying yeast so that intracellular acetolactate synthase activity is reduced, yeast with a high content of Abu, -Glu-Abu, and/or -Glu-Abu-Gly is obtained. An yeast extract is prepared by using the yeast obtained in such a manner as a raw material.

A capsule having an encapsulated material and a capsule wall encapsulating the encapsulated material. The capsule wall includes a N-acetylglucosamine/glucosamine copolymer or a derivative of such a copolymer, wherein the N-acetylglucosamine/glucosamine copolymer or a derivative of such a copolymer is derived from a raw material which has a non-animal origin. The capsules have significant compression resistance while minimizing the amount of polymer incorporated into the capsule wall and are advantageously stable in a range of products including when associated with commercially available protease containing, biological liquid laundry products.