摘要:
The present invention relates to a novel customized sRNA that reduces gene expression in prokaryotic cells, a preparation method thereof, and the use thereof, and more particularly to a synthetic sRNA comprising an Hfq binding site, derived from the sRNA of any one of MicC, SgrS and MicF, and a region that base-pairs with the target gene mRNA, and to a preparation method thereof and the use thereof. The synthetic sRNA according to the invention has an advantage in that the degree of inhibition of the target gene can be controlled by regulating the ability of the synthetic sRNA to bind to the mRNA of the target gene. The use of the synthetic sRNA that regulates the expression of the target gene makes it possible to effectively construct a recombinant microorganism without using a conventional gene deletion method and to reduce the expression of the target gene, and thus the synthetic sRNA is useful for the production of recombinant microorganisms. Also, the synthetic sRNA can be quickly applied to various strains, and thus is very suitable for the measurement of metabolic capabilities of strains and the selection of the most suitable strain. In addition, recombinant microorganisms, which are obtained by metabolic flux manipulation using the synthetic sRNA and produce tyrosine or cadaverine with high efficiency, are useful in the drug and industrial fields. In other words, the use of the sRNA according to the present invention can make it easy to select target genes whose expression is to be inhibited for the highly efficient production of metabolites. Accordingly, the synthetic sRNA can be used to construct recombinant strains for efficient production of various metabolites and to establish efficient methods for production of various metabolites, and thus is highly useful.
摘要:
Provided is a method of producing a chemical by a continuous fermentation method in which a washing effect of a separation membrane by a gas is enhanced by a simple operation procedure and high productivity can be stably maintained for a long time. The method of producing a chemical of the present invention includes: a chemical production step of culturing cells to ferment a feedstock to produce a chemical; a culture solution supply step of supplying a culture solution containing the chemical to a separation membrane unit; a filtration step of filtering the culture solution to separate a permeate containing the chemical; a reflux step of refluxing a retentate that is not filtered to the fermentor; and a washing step of supplying a gas containing oxygen to the separation membrane unit while the amount is changed to at least two different values to perform scrubbing, wherein the supply amount and time of the gas containing oxygen supplied in the chemical production step and the washing step are set so that a kLa value is within a predetermined range from an optimal kLa value for the cells cultured in the chemical production step.
摘要:
This invention provides polypeptides having lyase activity, polynucleotides encoding these polypeptides, and methods of making and using these polynucleotides and polypeptides. In one aspect, the invention is directed to polypeptides having ammonia lyase activity, eg phenylalanine ammonia lyase, tyrosine ammonia lyase and/or histidine ammonia lyase activity, including thermostable and thermotolerant activity, and polynucleotides encoding these enzymes, and making and using these polynucleotides and polypeptides. The polypeptides of the invention can be used in a variety of pharmaceutical, agricultural and industrial contexts.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von L-Aminosäuren durch Fermentation von rekombinanten Mikroorganismen der Familie Enterobacteriaceae, dadurch gekennzeichnet, dass man a) die die gewünschte L-Aminosäure produzierenden Mikroorganismen, in denen man den yhaO-ORF, für das Genprodukt kodierende Nukleotidsequenzen oder Allele abschwächt, insbesondere ausschaltet, in einem Medium kultiviert unter Bedingungen, bei denen die gewünschte L-Aminosäure im Medium oder in den Zellen angereichert wird, und b) die gewünschte L-Aminosäure isoliert, wobei gegebenenfalls Bestandteile der Fermentationsbrühe und/oder die Biomasse in ihrer Gesamtheit oder Anteilen (> 0 bis 100 %) im isolierten Produkt verbleiben oder vollständig entfernt werden.
摘要:
According to the present invention, there are provided a microorganism belonging to Enterobacteriaciae wherein a function of CsrB RNA or CsrC RNA has been decreased or lost, and which has the ability to produce and accumulate an amino acid, and a process wherein the microorganism is cultured in a medium to produce and accumulate the amino acid in the culture, and the amino acid is recovered from the culture.
摘要:
An enteric bacterial strain was engineered to over-produce L-tyrosine using a one-step method. The pheA-tyrA chromosomal region of the bacterial genome was replaced with an engineered chromosomal segment, resulting in inactivation of the pheA coding region and strong expression of the tyrA coding region, resulting in high levels of L-tyrosine production.
摘要:
A method for producing an optically active amino acid, which comprises adding ammonia to an acrylic acid derivative by action of a plant enzyme and obtaining the corresponding optically active amino acid. The method for producing an L-amino acid, which comprises, in the presence of ammonia, allowing phenylalanine ammonia-lyase derived from a plant to act on an acrylic acid derivative, which may have an aromatic ring group that may have various substituents and comprise a hetero atom.