83 results about "Rate limiting enzyme" patented technology

The present invention relates to a kit for the treatment of cancer comprising (a) a container for containing a first compound (i) or a precursor thereof, said first compound or precursor being a compound that oxidizes glutathione (GSH); (b) a container for containing a second compound (ii) or a precursor thereof, said second compound or precursor being a compound that forms an adduct or conjugate with GSH; (c) a container for containing a third compound (iii) or a precursor thereof, said third compound or precursor being a compound that inhibits the rate-limiting enzyme of GSH biosynthesis, gamma-glutamylcysteine synthetase (GCS); and (d) a container for containing a fourth compound (iv) or a precursor thereof, said fourth compound or precursor being a compound that inhibits the enzyme responsible for the conversion of GSSG to GSH, glutathione reductase (GR).

The invention discloses a composition for whitening skin, which comprises whitening functional components including persimmon leaf extractive, ginkgo leaf extractive, lotus extractive, crocus sativus flower extractivea pomegranate fruit extractive, dogwood fruit extractive, licoflavone, nicotinamide and ascorbyl glucoside. According to the invention, the whitening functional components can act before generating melanin, in the process of generating melanin, and after generating melanin; the purpose of whitening skin is achieved in multiple aspects of inhibiting gene expression of related rate-limiting enzyme synthesized by melanin, inhibiting enzymatic activity of the related rate-limiting enzyme synthesized by melanin, eliminating oxygen free radicals, reducing generated melanin, limiting melanin to transfer towards horn cells and the like; therefore, the composition for whitening skin disclosed by the invention is safe and effective.

Methods and compositions useful for preventing the disruption of thiol (sulfur) signaling which affects degenerative/age related disease and other disease states related to thiol redox signaling, such as S-glutathiolation. The compositions are capable of increasing the DNA transcription of Gamma-Glutamyl-cysteine synthase which is the rate limiting enzyme for the production of the thiol regulating enzyme Glutathione. The acid-stable compositions disclosed herein contain esterfied and free form cafestol and kahweol, and may be formed using ground roasted or unroasted coffee beans. The beans in combination with water are exposed to cavatonic energy sonic or mechanical. C&K typically increase cholesterol and damage the liver. The compositions disclosed are absorbed before or after the distal portion of the small intestines, eliminating liver toxicity and increases in cholesterol. Additional materials may be added to the compositions, such as additional hydrophobic compounds hydrophilic compounds, and may be added to the film or embedded in the compositions by the cavitation process. The process is also adapted for use in all standard methods of brewing coffee, causing the coffee to possess the disclosed compositions.

The invention discloses a saccharomyces cerevisiae recombinant bacterium. According to the saccharomyces cerevisiae recombinant bacterium, an RgTAL gene, an HpaB gene and an HpaC gene are integrated in a genome. The invention further discloses a construction method and application of the saccharomyces cerevisiae recombinant bacteria. The invention finally discloses a production method of caffeic acid. According to the invention, three exogenous genes required by caffeic acid synthesis are integrated into saccharomyces cerevisiae chromosomes; total synthesis from glucose to caffeic acid is achieved through knockout of competitive pathway genes, elimination of feedback inhibition steps and overexpression of rate-limiting enzymes, the shake flask yield reaches about 760 mg/L, the shake flaskyield is the highest level of the yeast yield reported at present, and a new method is provided for industrial production of caffeic acid.

The invention relates to the preparation of a wild cactus polyoses extract and the highly effective function thereof for reducing serum cholesterase. The extract is a polyoses extracted from the natural wild cactus polyoses, and can reduce the total cholesterol content in the hypercholesterolemia and obviously improve the lipid metabolic disturbance by improving the activity of in vivo lipid metabolic key enzyme lecithin cholesterin acylase and reducing the activity of synthetical rate-limiting enzyme 3-hydroxy-3-methyl pentane diacid coenzyme A reductase of liver cholesterin; the invention has no obviouse adverse reaction and can be used for preparing medicines used for lowering the cholesterin.

The invention provides a gene engineering strain streptomyces tsukubaensis L20 and application thereof. The gene engineering strain streptomyces tsukubaensis L20 is preserved in China General Microbiological Culture Collection Center; the preservation date is August 19, 2015; the preservation number is CGMCC No. 11252. The gene engineering strain streptomyces tsukubaensis L20 is relatively stable in inheritable character and fermentation unit, the culture and fermentation conditions are suitable for industrialized production, and the fermentation unit reaches a high level; the gene engineering strain streptomyces tsukubaensis L20 is utilized for improving the expression amount of a rate-limiting enzyme in a tacrolimus biosynthetic pathway through gene engineering, and serves as the rate-limiting enzyme during gene engineering of the tacrolimus biosynthetic pathway to improve the yield of tacrolimus, so that the cost of an industrialized production process can be reduced, and the fermentation unit of tacrolimus can be improved by 30%.

The invention provides genetic engineering strain Streptomyces tsukubaensis L21. The fungus preservation unit is CGMCC (China General Microbiological Culture Collection Center), the preservation date is August 19, 2015, and the preservation number is CGMCC No. 11253. According to the genetic engineering strain Streptomyces tsukubaensis L21, the strain genetic character and the fermentation unit are stable, culture and fermentation conditions are suitable for industrial production, and the fermentation unit is high. The copy number of specific controlling genes in the Tacrolimus creature biosynthetic pathway is increased through genetic engineering, and the genes improve rate-limiting enzyme in the Tacrolimus creature biosynthetic pathway so as to increase the Tacrolimus yield, reduce the cost in the industrial production process and improves the Tacrolimus fermentation unit to 945 mg/L.

The invention relates to an agricultural biotechnology, discloses a strawberry auxin synthetic rate-limiting enzyme gene FaYUC11 and application in adjustment of fruit sizes, and provides a nucleotide sequence and a protein sequence of the gene. A method for using the FaYUC11 to adjust the fruit sizes comprises the following steps of: constructing a virus induction silent vector of the FaYUC11 gene; and transferring the silent vector in agrobacterium, infecting young green fruits of strawberries by using a micro-injection method, and establishing a transgenosis strawberry strain silenced by the virus induction FaYUC11 gene. The content of free auxin in achenes (seeds) can be reduced through gene silencing; the growth rate of fruits in vertical and horizontal diameters is reduced; simultaneously, the hardness of fruits and the content of soluble solids are influenced; and thus, the gene disclosed by the invention has good application prospect in the aspect of adjusting and controlling the fruit sizes of strawberries, and has important significance on development of functional SNP (Single Nucleotide Polymorphism) molecular markers and breeding of high-quality large strawberries.

The invention discloses key enzymes expressed in saccharomyces cerevisiae, genetically engineered bacterium highly producing alpha- and gamma-tocotrienols as well as a construction method of the genetically engineered bacterium. Five enzymes capable of being expressed in the saccharomyces cerevisiae including HPPD, HPT, MPBQMT, TC and gamma-TMT respectively, are obtained through gene cloning and codon optimization; the five enzymes are integrated in saccharomyces cerevisiae genomes step by step, and the genetically engineered saccharomycete strain highly producing alpha- and gamma-tocotrienolsis constructed by further excising chloroplast transit peptides and over-expression rate-limiting enzyme, named YS-356c and has the collection number of CCTCC NO:M2019572. The tocotrienol yield reaches 2.09 mg/g dry cell weight. The engineered bacterium can be cultured by fermentation, alpha- and gamma-tocotrienols can be obtained directly from the bacterium, and the engineered bacterium has goodmarket prospects and application values.

The present invention discloses genetically engineered bacteria and application thereof in production of coenzyme Q10. The genetically engineered bacteria comprises coenzyme Q10 producing bacteria and desired genes transferred into the coenzyme Q10 producing bacteria, and the desired genes are a demethylnaphthoquinone methyltransferase gene, a 2-octo isoprene-3-methyl-6-methoxy-1,4-hydroquinone hydroxylase gene and a 3-demethyl ubiquinone-93-methyl transferase gene. Rate-limiting enzyme genes UbiE, UbiG and UbiF in a coenzyme Q10 synthetic route are transferred into rhodobacter sphaeroides, and by in-series over-expression of the three rate-limiting enzyme genes UbiE, UbiG and UbiF, coenzyme Q10 synthesizing capability of the rate-limiting enzyme genes can be strengthened; and compared with the rhodobacter sphaeroides with no desired gene being transformed, by use of the genetically engineered bacteria for coenzyme Q10 producing, the yield of the coenzyme Q10 is increased by more than 20%.

Methods of increasing the cellular pool of A-CoA and thus driving the metabolic pathways in the direction of A-CoA containing metabolites by overexpressing rate limiting enzymes in A-CoA synthesis. Methods of increasing intracellular levels of CoA and A-CoA through genetic engineering of bacterial strains in conjunction with supplementation with precursor molecules.

The invention discloses a 3-hydroxy-3-methylglutaryl coenzyme A reductase gene RKHMGR and application thereof. A nucleotide sequence is as shown in SEQ ID NO: 1, an amino acid sequence encoded by thegene is as shown in SEQ ID NO: 2, the gene is a key enzyme gene of carotenoid synthesis in YM25235 of Rhodosporidium Kratochvilovae, is the first rate limiting enzyme in an MVA pathway, and can regulate the YM25235 of the Rhodosporidium Kratochvilovae to generate the carotenoid. According to the 3-hydroxy-3-methylglutaryl coenzyme A reductase gene RKHMGR and the application thereof, microorganismis transformed by means of genetic engineering, the yield of the carotenoid in the microorganism is improved, and a foundation is laid for large-scale commercial production of the carotenoid.

The invention provides a gene engineering strain Streptomyces chattanoogensis. The preservation registration number of the gene engineering strain Streptomyces chattanoogensis is CGMCC No.7182, the nucleotide sequence of the gene engineering strain Streptomyces chattanoogensis is represented by SEQ ID NO.1, and the gene engineering strain Streptomyces chattanoogensis is obtained through the genetic construction of a rate-limiting enzyme in the biosynthetic way of natamycin. Compared with gene engineering strain Streptomyces chattanoogensis L10, the gene engineering strain Streptomyces chattanoogensis L11 has the advantages of more stable hereditary characters, improvement of the natamycin fermentation unit to 3.12g/L from 2.21g/L, shortening of the natamycin fermentation period to 120h from 144h, improvement of the natamycin output by 40%, shortening the fermentation period by 24h, and reduction of the industrialized production process, and can be applied to the generation of natamycin.

The invention relates to the technical field of genetic engineering, and discloses a saffron crocus sourced CCD2 mutant, a coding sequence and application thereof, as well as a recombinant yeast strain for producing crocetin. The CCD2 mutant is provided with one or two or above of V120F, Y190K/A, R192V/F, E211A, E212A, T290V, K320A and S323F/A/T locus mutations. A rate-limiting enzyme CCD2 in thesynthesis route of the crocetin is transformed, the crocetin is directly synthesized from beta-carotene by widening the substrate spectrum of the CCD2, and the existing synthesis route of the crocetinis simplified and reconstructed, so that the problem that the total yield of multiple reactions is generally low is solved; and meanwhile, the efficiency of the CCD2 catalyzing an original substratezeaxanthin to synthesize the crocetin is improved, and the yeast strain of the high-yield crocetin is further obtained.

The invention relates to a tylosin gene engineering strain. The construction method for the tylosin gene engineering strain comprises the following steps: cloning tylosin through polymerase chain reaction (PCR) to synthesize crucial rate-limiting enzyme gene TylF and Vitreoscilla hemoglobin VHb gene, constructing a recombinant plasmid by using an E. coli-streptomyces shuttle vector, importing the recombinant plasmid into Escherichia coli ET12567/pUZ8002, performing conjugal transfer culture on the Escherichia coli ET12567/pUZ8002 and streptomyces fradiae spores, converting streptomyces, screening a converter through apramycin resistance, further confirming the converter by using PCR, and finally obtaining the gene engineering strain. The tylosin gene engineering strain can be directly used in the industrial production of tylosin; and compared with the tylosin gene engineering strain used in the conventional industrial production, the tylosin gene engineering strain has the advantages that the yield of the tylosin can be obviously improved to be 17,000-18,000u/ml and the content of a component A in the tylosin is effectively improved to be 94-95 percent.

The invention provides an actinobacillus succinogenes PZ improving yield of succinic acid, and a construction method thereof. The construction method comprises the steps of constructing an expression carrier, constructing recombinant plasmid and constructing the actinobacillus succinogenes PZ. The actinobacillus succinogenes starting strain is connected in series with and expressed excessively by gene pepck of a key rate-limiting enzyme, PEPCK, for generating succinic acid by using the actinobacillus succinogenes, and gene zwf of G6PDH improving the restoring force level in a body, so as to acquire the actinobacillus succinogenes PZ. The actinobacillus succinogenes PZ can improve the yield of succinic acid, and has the potential of industrial production application.

The invention discloses a cryptomeria fortunei CfCCR gene and an application thereof, belonging to the technical fields of plant molecular biology and gene engineering. The cryptomeria fortunei ligninsynthesis regulation CfCCR gene provided by the invention has a nucleotide sequence as shown in SEQ ID NO. 1, and the amino acid sequence of an expression protein of the cryptomeria fortunei lignin synthesis regulation CfCCR gene is as shown in SEQ ID NO. 2. The CfCCR gene is a key rate-limiting enzyme of a lignin synthesis specific pathway, regulates the expression of related genes for synthesizing lignin in plants through encoding protein, and plays an important role in biosynthesis and stress resistance of lignin. The tobacco transformed with the CfCCR gene is increased in lignin expression and developed in cell walls. Thus, the thickness of xylem cell walls in plant stems like cryptomeria fortunei can be changed by expressing the CfCCR gene, so the wood density is increased, and the wood quality and plant stress resistance are improved.

The invention discloses a yeast engineering bacterium for fermentation production of alpha-santalene and application of the yeast engineering bacterium, and belongs to the field of bioengineering. Yeast is used as an original strain, and the yeast engineering bacterium for fermentation production of alpha-santalene is obtained through gene introduction construction. The engineered yeast strain can efficiently produce alpha-santalene, the shake flask fermentation yield of the engineered yeast strain is nearly 3.0 g/L, and the fermentation yield of a 1L fermentation tank can reach 15 g/L. The metabolic flux in the alpha-santalene biosynthesis pathway is improved through high expression of key rate-limiting enzyme in the metabolic pathway, enhancement of precursor supply and a multi-copy strategy, the alpha-santalene is efficiently generated by using the pichia pastoris, and the method has the characteristics of short period, environmental protection and resource saving. The engineered yeast strain for producing alpha-santalene at high yield has a wide application prospect.

The invention discloses a method for increasing content of zeaxanthin in anabaena. The method is characterized by comprising the following specific steps: cloning critical rate-limiting enzyme gene beta-carotene hydroxylase gene for synthesis of zeaxanthin from dunaliella salina teodoresce, constructing the gene into a shuttle expression vector pRL25C, and transferred into anabaena by a triparetal conjugation method, genetically modified anabaena is obtained by resistance screening, and after 16000Lx high-light treatment, the method has the advantage that the content of zeaxanthin in genetically modified anabaena is increased greatly compared with wild type anabaena, and can be increased by 3.8 times to the greatest extent.

The present invention provides one kind of genetically engineered bakanae fungus. The genetically engineered bakanae fungus is prepared through the process of: PCR amplification of rate-limiting enzyme gene cps/ks synthesized with gibberellin and powerful promoter Pgpd or PtrpC, cloning them to corresponding sites of the target plasmid capable of expressing in mycelial fungus to obtain super-expressing cps/ks gene vector with driving powerful promoter, transforming the super-expressing cps/ks gene vector into bakanae fungus to obtain the genetically engineered bakanae fungus. The present invention improves bakanae fungus by means of genetic engineering technology, and has determined fungus culturing target and high efficiency. The obtained engineered bakanae fungus has powerful gibberellin synthesizing ability, 40 % raised from the initial bakanae fungus strain.

The invention relates to a method for breeding a high-yield enramycin strain. The method comprises the following steps: determining the short gene of a rate-limiting enzyme coding gene in the enramycin biological synthesizing process; constructing a thiostrepton resistance gene integrating vector; mutagenizing the modified strains, and screening a thiostrepton high-resistance strain from the modified strains; and carrying out genetic manipulation on the screened high-resistance strain, and restoring the tsr open reading frame to the original endX gene to obtain the strain which is an enramycinhigh-yield mutant strain. The method combines advantages of a traditional mutation breeding technology and a modern molecular biological method to realize quick and efficient screening of the enramycin high-yield strain. The method is applicable to screening of other antibiotic high-yield strains.

The present invention provides a construction method for efficient biosynthesis of streptomycete drugs. The construction method comprises: based on an inducible promoter O[R]O[lac] and a strong promoter ermEp<*>, firstly constructing a gradient induction expression system in streptomycete; controlling the expression level of target gene through the gradient induction, and carrying out coupled analysis on the relationship between the expression level of the target gene and the yield of the target drug so as to reveal the rate-limiting reaction in the drug biosynthesis path and the suitability of the rate-limiting enzyme; and through a constitutive promoter ermEp<*>, rationally carrying out series coupling on the encoding genes highly expressing the relevant rate-limiting enzyme so as to obtain a strain of the high-yield S Chattanoogensis producing strain L12, and transporting the strain to the China General Microbiological Culture Collection Center to preserve, wherein the preservation number is CGMCC No.10157. According to the present invention, the shake flask fermentation results show that the Natamycin yield in the S Chattanoogensis L12 is 3.3 times the yield in the S Chattanoogensis L10, and the 50 L fermentation tank small test results show that the highest yield achieves 15.7 g/L; and the method of the present invention has characteristics of efficiency, accuracy and simple operation, and is generally suitable for other streptomycetes.

In accordance with the present invention, it has been discovered that CREB regulates hepatic gluconeogenesis via the co-activator, PGC-1. PGC-1 potentiated glucocorticoid induction of the gene for PEPCK, the rate limiting enzyme in gluconeogenesis, via the glucocorticoid response unit in the promoter, indicating that activation of PGC-1 by CREB in liver contributes to the pathogenesis of diabetes mellitus. In accordance with the above discoveries, the present invention provides a method of identifying a compound that modulates gluconeogenesis. The invention method comprises contacting CREB and a nucleic acid comprising a PGC-1 promoter with a test compound, and determining if the test compound modulates binding between CREB and the PGC-1 promoter.

The invention discloses a method for evaluating an effect of PM2.5 full chemical component particles on free radical metabolic pathways in human lung cells. The method is characterized in that human lung-bronchial epithelial cells are exposed by means of the PM2.5 full chemical component particles, a liquid chromatography-mass spectrometry (LC- MS) can be used for effectively analyzing micromolecular metabolites in cells, enzymatic activity is quickly analyzed by combining with a biological detection method, and changes of the micromolecular metabolites related associated with intracellular free radical metabolism and activity changes of a rate-limiting enzyme that plays a key role in energy metabolism are integrated, in summary, a set of new methods for evaluating the interference on intracellular oxygen free radical metabolism after cells are exposed to toxic effect of exogenous pollution are constructed based on molecular biology. The method can analyze the influence of contaminantson the free radical metabolic pathways in the cells intuitively, and has the advantages of simple preprocessing method, rapid detection, good repeatability, comprehensive information acquisition andthe like.