294 results about "Escherichia" patented technology

O-acetylserine, L-cysteine and sulphurous compounds derived therefrom may be produced using a bacterium belonging to the genus Escherichia which harbors a mutant feedback-resistant serine acetyltransferases in which the amino acid sequence corresponding to positions from 89 to 96 in a wild-type serine acetyltransferase is replaced with any one of the amino acid sequences shown in SEQ ID NOS: 4 to 9, and feedback inhibition by L-cysteine in the bacterium is desensitized.

L-threonine or L-isoleucine is produced by culturing a bacterium which belongs to the genus Escherichia and has an ability to produce L-threonine or L-isoleucine, and wherein expression of a threonine operon is directed by its native promoter, and from which at least a leader sequence and an attenuator are deleted, in a medium and collecting the L-threonine or L-isoleucine from the medium.

A bacterium belonging to the genus Escherichia which has an ability to produce L-lysine or L-threonine and which is modified so that a malic enzyme does not function normally in a cell, and a method for producing L-lysine or L-threonine, comprising culturing the bacterium in a medium to produce and cause accumulation of L-lysine or L-threonine, and collecting the L-lysine or L-threonine from the medium.

Methods and compositions are provided for treating weight related conditions and metabolic disorders by altering microbiota in a subject. One aspect provides methods and compositions to alter microbiota in a subject by administering to the subject a composition that includes a substantially purified microbiota from phyla such as Bacteroidetes, Proteobacteria, Firmicutes and Verrucomicrobia or orders such as Bacteroidales, Verrucomicrobiales, Clostridiales and Enterobacteriales or genera such as Alistipes, Clostridium, Escherichia, and Akkermansia. Another aspect includes a pharmaceutical composition for altering microbiota that includes a therapeutically effective amount of substantially purified microbiota and a pharmaceutically acceptable carrier. Yet another aspect includes methods for treating a disorder, such as obesity, in a subject in need of such treatment by changing relative abundance of microbiota in a gastrointestinal tract of the subject without or in addition to a surgical procedure.

A dietary supplement that may contain probiotics from the genera Akkermansia, Bacteriodes, Faecalibacterium, Eubacterium, Escherichia, Collinsella, Desulfovibrio, Clostridium, Mycobacterium, Pediococcus, and Bifidobacterium. The dietary supplement may provide a variety of benefits including weight management, blood sugar management, treatment of irritable bowel syndrome, treatment of Crohn's disease, treatment of diverticulitis, treatment for inflammatory bowel, treatment for dysbiosis, and strengthening the immune system.

The present invention describes the production of L-tyrosine by culturing in a medium an Escherichia bacterium which has L-tyrosine-producing ability and which carries a mutant prephenate dehydrogenase which is desensitized to feedback inhibition by L-tyrosine, producing and accumulating L-tyrosine in the medium or in the bacterial cells, and collecting L-tyrosine from the medium or the bacterial cells.

Disclosed is a composition and method for the treatment and prevention of bad breath, halitosis, gingivitis, and / or periodontitis that contains one or more varieties of probiotic bacteria from the groups Lactobacillus, Bacillus, Escherichia, Enterococcus, Streptococcus, and Bifidobacterium, and / or a species of the yeast genus Saccharomyces. The composition may be in a variety of forms, such as a toothpaste, mouthwash, oral spray, oral cream or gel, chewing gum, candy, lozenges, dissolvable pill or strip, or powder that may be sprinkled directly into the oral cavity.

Disrupting the expression of endogenous Escherichia host cell genes gcvA and spr provides mutant host cells having increased heterologous peptide production relative to control Escherichia host cells. Recombinant Escherichia host cells are provided as well as methods of using such host cells for heterologous peptide production.

There is disclosed a method for producing L-threonine using bacterium belonging to the genus Escherichia wherein the bacterium has been modified to enhance an activity of aspartate-β-semialdehyde dehydrogenase.

The invention relates to candida Antarctica lipase B gene and applications thereof in yeast display. Coded protein of improved candida Antarctica B and wild type candida Antarctica lipase protein have the same function on the amino acid level; the heat resistance capacity of the enzyme is 50-80 DEG C, and the half-lift is 3-24 hours; a nucleotide sequence is hybridized with SEQ.ID.NO2 from 1st to 978th of nucleotide under the moderate precise condition; and a preservation number of colon bacillus DH5Alpha / Puc57-CALB (Escherichia coliDH5Alpha / pUC57-CALB) which carries the plasmids is CCTCC M 209081. The candida Antarctica lipase B gene is transferred into pichia pastoris host bacteria so as to realize the high-efficient display expression of the candida Antarctica lipase B in pichia pastoris; and the provided pichia pastoris bacteria can effectively display candida Antarctica lipase B, can be widely applied to the synthesis of ethyl caproate, has different melting points and does not contain triglyceride of various fatty acids, a plurality of structured lipids, and the like.

O-acetylserine, L-cysteine and sulphurous compounds derived therefrom may be produced using a bacterium belonging to the genus Escherichia which harbors a mutant feedback-resistant serine acetyltransferases in which the amino acid sequence corresponding to positions from 89 to 96 in a wild-type serine acetyltransferase is replaced with any one of the amino acid sequences shown in SEQ ID NOS: 4 to 9, and feedback inhibition by L-cysteine in the bacterium is desensitized.

The invention discloses an enzyme conversion method for preparing gamma-butyric acid. The preparation method comprises employing two mixed acidic amino acids of L-glutamic acid and L-aspartic acid as raw material, mixing the cells of Escherichia.coli AS1.505 with highly active L-glutamic acid decarboxylases and the conversion liquid containing the mixture of L-glutamic acid and L-aspartic acid, implementing enzymatic reaction under the temperature of 28~45íµ, then separating the conversion products by isoelectric point crystallization process or isoelectric point crystallization and ion exchange resin combined method to obtain high purity gamma-butyric acid and L-aspartic acid. The invention solves the problem of the highly effective separation of two acidic mixed amino acids, and obtains gamma-butyric acid with higher additional value, and has advantages of low price, simple operation, short conversion time, and low production cost.

A method is provided 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 influences the distribution of carbon flow, such as the sucAB genes, comprising introducing into the chromosome of the bacterium a set of in vitro constructed DNA fragments which contain regulatory elements for gene expression instead of the native elements of the regulatory region of the gene, and selecting the colonies with increased L-amino acid productivity. Also, a method is provided for producing an L-amino acid, such as L-glutamic acid, L-proline, L-arginine, L-glutamine, L-leucine, using the bacterium with an optimized level of expression of the sucAB gene.

The invention discloses a submerged fermentation phellinus linteus mycelium glycoprotein, a usage and a separation extraction preparation method thereof, the complex is the complex of heteropolysaccharide and protein, wherein, the content of the heteropolysaccharide is 15 to 20 percent, and the heteropolysaccharide is composed of three monosaccharides of glucose monosaccharide, xylose and mannose; the content of the protein is 80 to 85 percent, and the protein is composed of 18 amino acids of aspartic acid, glutamic acid, arginine and so on; and the weight-average molecular weight is 20 to 40KD. The glycoprotein complex uses bran extract liquid as a main ingredient for preparing a culture medium, the phellinus linteus mycelium is produced by the submerged fermentation of the phellinus linteus bacterial strain liquid, the homogenization, the cold-water extraction, the centrifugalization, the collection of supernatant liquid, the precipitation of ammonium sulfate, the dialysis and the DEAE-Sepharose Fast Flow column chromatography are carried out for system separating and purifying the glycoprotein complex. The anti-bacterial glycoprotein is used for preparing the anti-bacterial dugs which have inhibitory effects on escherichia coil and staphylococcus aureus. At the same time, the glycoprotein complex can be used for the separation and the purification of the glycoprotein from the mycelium obtained by the submerged fermentation of various medical and edible fungi.

Methods for producing purine nucleosides, and purine nucleotides, such as inosine and 5′-inosinic acid are provided which include using a bacterium belonging to the genus Bacillus or to the genus Escherichia wherein the purine nucleoside productivity of said bacterium is enhanced by increasing an activity of the YdhL protein. Also disclosed is the amino acid sequence of the YdhL protein from Bacillus amyloliquefaciens and the gene encoding it.

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 a gene coding for sRNA.

A method for producing an L-amino acid, such as L-histidine, L-threonine, L-lysine, L-glutamic acid, and L-tryptophan, using bacterium belonging to the genus Escherichia which has increased expression of genes, such as those of the xylABFGHR locus, which encode the xylose utilization enzymes, is disclosed. The method includes cultivating the L-amino acid producing bacterium in a culture medium containing xylose, and collecting the L-amino acid from the culture medium.

Disclosed is a strain of Escherichia sp., capable of producing O-acetyl homoserine in high yield, with the introduction and enhancement therein of the activity of: homoserine acetyl transferase, aspartokinase and homoserine dehydrogenase; and at least one enzyme selected from a group consisting of phosphoenolpyruvate carboxylase, aspartate aminotransferase and aspartate semi-aldehyde dehydrogenase. Also, a method of producing O-acetyl homoserine using the strain is provided.

The invention relates to a method of synthesizing trehalose by virtue of whole cell catalysis. The method comprises the following steps that: recombinant Escherichia coli cells used for massively producing trehalose synthase are cultivated in a fermenting manner, permeable treatment is carried out on the recombinant cells by using an ecological biosurfactant, and the trehalose is synthesized by the treated cells in a phosphate buffering system by using maltose as a substrate. According to the method disclosed by the invention, the Escherichia coli after the permeable treatment is used for synthesizing the trehalose by using the 25-3 percent of maltose as the substrate, the conversion rate of the substrate can reach 55-60 percent after reaction for 16-20 hours at the temperature of 20-25 DEG C; in addition, compositions of a reaction solution are very simple, thus greatly simplifying an extraction and purification technology of the permeable treatment. By utilizing the method provided by the invention, the trehalose with high quality can be efficiently produced in a large scale with low cost.

A Bacillus strain characterized by (i): sensitivity for ampicillin, vancomycin, gentamicin, kanamycin, streptomycin, erythromycin, clindamycin, tetracycline and chloramphenicol; (ii) antimicrobial activity against E. coli and Clostridium perfringens; and (iii) a sporulation percentage of at least 80 when measured after 2 days of incubation. The invention further relates to a method for selecting such strains. Many of the identified strains according to the invention are of the species Bacillus amyloliquefaciens. Some of the Bacillus amyloliquefaciens were further identified as Bacillus amyloliquefaciens subsp. amyloliquefaciens whereas others were identified as amyloliquefaciens subsp. plantarum. A Bacillus strain of the invention may be used as a feed additive to animal feed where it has a probiotic effect.

The invention discloses a promoter with a nucleotide sequence as follows: 1) a nucleotide sequence shown in sequence 1 in a sequence table; 2) a nucleotide sequence which hybridizes with the nucleotide sequence in 1) under strict conditions and has promoter activity; or 3) a nucleotide sequence which has homology of more than 70% with the nucleotide sequence in 1) and has promoter activity. The promoter provided by the invention can be applied to the biotechnology field with corynebacterium or escherichia bacteria as industrial microbes. Experiments prove a fragment with promoter activity from SEQ ID NO:1 has the activity higher than that of a trc promoter (SEQ ID NO:2).

The invention discloses an intestinal flora maker for intestinal cancer and an application of the intestinal flora maker, and belongs to the technical fields of microorganisms and genetic engineering.The intestinal flora maker comprises megasphaera, veillenella, streptococci, bilophila sp., haemophilus, corynebacterium or Escherichia-Shigella. Through detection by the intestinal flora maker, risks of individuals suffering from intestinal cancer can be assessed, and auxiliary reference can be provided for disease diagnosis and prognosis monitoring.

This invention discloses a method for improving the salt resistance and drought resistance of the corn and wheat by aggregating the beta, NHX1, PPase genes with the transfer genes, the steps as follows: regrouping the solution film natrium hydrogen counter-operating protein gene NHX1, the solution film tar phosphatase gene PPase and the Cholinesterase dehydrogenase gene from the escherichia colim to the plant expression carrier, then adding the corn or wheet cells and make them express efficiently, then producing the transfer gene plant; screening out the transfer gene pure cell that has apparently higher salt resistance and drought resistance from the transfer gene plant and its offspring; getting the transfer gene plant with the three object genes through twice tranfering the transfer gene pure cell or making the plant with the different transfer genes mate mutully, then sceening out the ones that have better salt resistance and drought resistance in their offsprings, and making them mute and purify by themselves to creat the new corn and wheat seeds with the salt resistance and drought resistance; or making use of the transfer polymeric material to produce the mixing seeds directly.

The invention discloses a household electromagnetic-shielding radiation-proof textile fiber material. The household electromagnetic-shielding radiation-proof textile fiber material comprises two-component or three-component radiation-proof yarn formed by blending metal filament fibers with polyester fibers, cotton or viscose fibers, wherein the weight of the metal filament fibers accounts for 20-35% of that of the two-component radiation-proof yarn, and the weight of the other component accounts for 65-80% of that of the two-component radiation-proof yarn; the weight of the metal filament fibers accounts for 15-25% of that of the three-component radiation-proof yarn, and the weights of another two components account for 30-35% and 40-55% of that of the three-component radiation-proof yarn respectively. The invention further discloses radiation-proof shell fabric produced from the household electromagnetic-shielding radiation-proof textile fiber material and application of the shell fabric. The radiation-proof shell fabric produced from the household electromagnetic-shielding radiation-proof textile fiber material is remarkable in radiation-proof effect, is not less than 90% in antibacterial rate for staphylococcus aureus, candida sporogenes and escherichia coli, and can be produced into radiation-proof home textiles such as suites, quilts and mosquito nets.

The invention discloses a carbonyl reductase expressed recombination engineering bacterium and application thereof. The engineering bacterium comprises a host cell and a recombinant vector transferred into the host cell, wherein the recombinant vector consists of an original vector and a target gene connected into the original vector, the host cell is Escherichiacoli Rosetta (DE3), the target gene is a carbonyl reductase gene, and the base sequence is shown in SEQ ID NO.1. According to the recombination engineering bacterium, the expression level of a carbonyl reductase is high, bacterial cells which are prepared through induced culture are used for converting N,N-dimethyl-3-oxy-3-(2-thienyl)-l-propylamine hydrochloride into (S)-N,N-dimethyl-3-hydroxy-3-(2-thienyl)-l-propylamine or converting 4-chloroethyl acetoacetate into (S)-4-chloro-3-hydroxyethyl butyrate, and the two products are higher in both optical purity and conversion rate.

L-Cysteine is produced by culturing a bacterium belonging to the genus Escherichia having an L-cysteine producing ability and modified so that cystathionine-β-lyase activity or cystathionine-β-lyase activity and tryptophanase activity should be reduced or eliminated in a medium to produce and accumulate L-cysteine in the medium and collecting the L-cysteine from the medium.

Disrupting the expression of endogenous Escherichia host cell genes gcvA and spr provides mutant host cells having increased heterologous peptide production. The addition of a genetic modification to the coding region of gene yejM further enhances peptide production and facilitates easier downstream processing. Recombinant Escherichia host cells are provided as well as methods of using such host cells for heterologous peptide production.

The first primer of the invention is a primer which, when used in PCR under appropriate conditions, serves to detectably amplify 16S rRNA-encoding DNAs of bacteria of the Escherichia, Salmonella and Vibrio genera, but when used in PCR under the same conditions, does not serve to detectably amplify either chloroplast 16S rRNA-encoding DNAs or mitochondrial 16S rRNA-encoding DNAs. The second primer of the invention is a primer which, when used in PCR under appropriate conditions, serves to detectably amplify 16S rRNA-encoding DNAs of Staphylococcus aureus and Bacillus cereus, but when used in PCR under the same conditions, does not serve to detectably amplify either chloroplast 16S rRNA-encoding DNAs or mitochondrial 16S rRNA-encoding DNAs.

The present invention provides a method for producing an L-amino acid using a bacterium of the Enterobacteriaceae family, particularly a bacterium belonging to the genus Escherichia or Pantoea, which has been modified to enhance expression of at least one gene of the fucPIKUR operon.