52 results about "Cotransformation" patented technology

The invention provides a simple and convenient Agrobacterium Tumefacies dual carrier containing double T-DNA structural regions, and a method of using the carrier system to cultivate transgenic rice without resistance selection label. With the help of the principle of co-conversion mediated by root nodule Agrobacterium Tumefacies, the system contains two separate T-DNA structural sections, where the first T-DNA region contains antibiotic resistance selection label gene and the second one contains a universal polyclonal site able to be arbitrarily inserted with destination gene. The double-T-DNA carrier has small molecular weight, easy to clone and after the destination gene and necessary regulation and control series are cloned in the T-DNA region containing the polyclonal site, it realizes rice co-conversion; by selfing, it selects transgenic individual with destination gene but without selectin label gene from the self-bred progeny, thus eliminating the negative effect on transgenic plant commercialized production, etc, possibly caused by selection label gene.

The present invention includes compositions and methods of co-transformation of naturally competent cells. In one aspect of the invention, a method is included for introducing nucleic acid sequences into one or more naturally competent cells in parallel. In other aspects, a heterogenic pool of co-transformed naturally competent cells and an apparatus for introducing two or more populations of nucleic acid sequences into a population of naturally competent cells in parallel are also included.

The invention relates to a pig breeding and breathing complex virus (PPRSV) and pig 2-type loop virus (PCV 2) series gene recombination adenovirus and vaccine in the field of high and new biotechnology. It uses PCR technology to clone the Cap protein gene into the plasmid carrier pShuttle-CMV-GP5 by open type reading rule and transforms tobacillus coli BJ5183strain with cage carrier pAdEasy-1 to capture the recombination plasmid; it uses recombination plasmid HEK293-A cell to capture recombination adenovirus and purifies it to express the recombination adenovirus rAd-Cap-GP5 of PRRSV GP5protein and PCV-2 Cap protein.

The present invention relates to pig reproduction and respiratory syndrome virus recombined adenovirus and vaccine, and belongs to the field of biological high-tech. Through RT-PCR process to proliferate whole PRRSV GP5 sequence, cloning the gene sequence to the shuttle vector pShuttle-CMV of adenovirus carrier system, cotransforming colibacillus BJ5183 strain together with the skeleton vector of adenovirus carrier system to obtain recombinant plasmid, transfecting HEK293-A cell to obtain recombinant adenovirus and plaque purification, and RT-PCR and indirect immunofluorescence technique inspection, the recombinant adenovirus rAd-GP5 expressing PRRSV GP5 protein is constituted. The recombinant adenovirus can set ahead the expression of PRRSV GP5 protein and raise the expression amount to simulate the immune protecting reaction of body effectively.

The invention discloses a construction method of genetically engineered bacterium for producing astaxanthin, which is characterized by comprising the following steps: A)constructing a gene expression module, wherein the gene expression module comprises relative gene for producing astaxanthin, a promoter at the upstream of relative gene for producing astaxanthin and a terminator at the downstream of the relative gene for producing astaxanthin; and B)performing cotransformation of the gene expression module to saccharomyces cerevisiae. The method has the advantages of simple, rapid and high efficiency performance, multi-grade clone is avoided, restriction enzyme cutting site is not required for depending on, multiple fragments enable cotransformation, the homologous recombination efficiency is high, and the engineering bacteria construction time can be obviously shortened.

The invention discloses a construction method of genetically engineered bacterium for producing beta-carotene, which is characterized by comprising the following steps: A)constructing a gene expression module, wherein the gene expression module comprises relative gene for producing beta-carotene, a promoter at the upstream of relative gene for producing beta-carotene and a terminator at the downstream of the relative gene for producing beta-carotene; and B)performing cotransformation of the gene expression module to saccharomyces cerevisiae. The method has the advantages of simple, rapid and high efficiency performance, multi-grade clone is avoided, restriction enzyme cutting site is not required for depending on, multiple fragments enable cotransformation, the homologous recombination efficiency is high, and the engineering bacteria construction time can be obviously shortened.

The invention relates to a method for converting disease-resistance genes of rice and obtaining transgenic descendants without selective markers. The method comprises the following steps: first, cloning green fluorescent protein (GFP) and hygromycin phosphotransferase (HPT) on a marker gene carrier, placing a target gene in other T-DNA carrier, mixing strains of agrobacterium tumefaciens carrying the marker gene carrier and strains of agrobacterium tumefaciens carrying the target gene carrier and converting callus of the rice, performing PCR (polymerase chain reaction) detection on the disease-resistance genes of the target gene carrier by a specific primer, and screening to obtain co-transformation plants (T0); then, screening the marker gene plants with positive GFP rapidly and massively by means of a desk lamp fluorescence detector in segregative generations (T1 or T2) of the co-transformation plant for removing, and performing PCR detection for disease-resistance genes to the plants with negative GFP so as to obtain the individuals without selective markers of the transgenic disease-resistance genes. The method can be applied to transgenic breeding without selective markers of rice blast-resistant genes or other functional genes of the rice, and enhances the disease resistance of the rice or improves other agronomic traits.

The invention relates to the field of gene engineering, in particular to a multi-gene binary expression vector constructed by using homologous recombination. The multi-gene binary expression vector is formed by connecting single genes or multiple genes into a multi-gene polymer through polyclonal enzyme cutting sites so as to form a homologous recombination intermediate vector and adding the single-gene or multi-gene polymer into a basic binary vector by homologous recombination, wherein the homologous recombination can be performed for multiple times, so that the T-DNA length of the basic binary vector is gradually increased. The invention also discloses a construction method of the multi-gene binary expression vector and application in plant transgenes. The multi-gene binary expression vector applied in plant genetic modification can transfer multiple target genes at the same time, and has the advantage of high co-transformation efficiency.

The invention is a method for adopting the cotransformation of genes cyp71av1 and cpr to increase the arteannuin content in southernwood in the gene engineering technology field. The invention clones the gene cyp71av1 of the CYP71AV1 and the gene cpr of the CPR from the southernwood to construct the plant expression vector which contains DNA molecules and agrobacterium tumefaciems is used for mediation; the genes of cyp71av1 and cpr are admitted into the southernwood for regenerating plant; a PCR is used for detecting the integration situation of the foreign object genes of the cyp71av1 and the cpr and a high-efficiency liquid phase chromatography-evaporative light scattering detector is used for detecting the arteannuin content in southern wood and the transgenic southernwood plant with increased arteannuin content is selected. The invention obtains the transgenic southernwood with obviously increased arteannuin content and the highest content is 1.82 times the content of the non-transgenic plant.

The invention relates to a method for preparing H2 and CO through the cotransformation of CH4 and CO2 and a device thereof, which pertain to the technical filed of petrochemical industry and coal-chemical industry. The reactant gases CH4 and CO2 are premixed by mole ration of 1:1 to 4:1, sent into a plasma reactor for reaction, separated by a polysulphone membrane H2 separator and then separated by a CO separator, with the left gas sent back to be premixed with feed gas, thereby obtaining H2 and CO by circulative preparation. A gas premixer (1), a plasma reactor (2), an H2 separator (3) and a CO separator (4) are connected in sequence, and the outlet that does not separates gas of the CO separator is connected with the inlet of the premixer. The invention also provides a method and a device that include the steps of reaction-separation-separation-reaction-separation-separation for twice or a plurality of times. The method and the device of the invention avoid terminated reaction caused by inactivated catalyst and realize the preparation of H2 and CO at low temperature, effectively reduce the energy consumption and have high transformation rate of CH4 and CO2 and good product selectivity.

The invention provides a yeast recombinant human III type triple helix collagen and a preparation method thereof. The preparation method comprises the following steps: S1, constructing a pPICZ alpha B plasmid containing a human III type collagen alpha 1 chain; s2, constructing a double-promoter expression vector of the alpha subunit and the beta subunit of the human P4H; s3, co-transforming the double-promoter expression vector and the pPICZ alpha B plasmid into saccharomycetes, so as to obtain a co-expression strain; s4, screening a yeast recombination strain containing a P4H alpha subunit and a beta subunit from the co-expression strain; and S5, carrying out induced expression on the yeast recombinant strain to obtain the yeast recombinant human III-type triple helix collagen. According to the preparation method disclosed by the invention, the problem of pyrogen does not exist, the generation of immunogenicity is effectively avoided, and the interaction force, the thermal stability and the anti-enzymolysis level among collagen molecules are effectively improved.

The invention belongs to the technical field of biology, in particular relates to a method for enhancing the content of vitamin E in plants by the cotransformation of double key enzyme genes of gamma-tmt and hpt. The method comprises the following steps of: cloning the genes of the gamma-tmt and the hpt from the plants, constructing a plant expression vector containing the DNA molecule, mediating by agrobacterium tumefaciens, introducing the genes of the gamma-tmt and the hpt into the plants simultaneously, regenerating plants, detecting the integration condition of the extraneous target genes of the gamma-tmt and the hpt by PCR, measuring the content of the vitamin E in the plants by a high-efficiency liquid chromatography-ultraviolet light detector and sieving to obtain a transgenic plant with the enhanced content of the vitamin E. The content of the vitamin E in the leaves of the obtained transgenic plant is obviously enhanced, and the highest content reaches 4 times of that of non-conversion check plants. The invention has an important meaning for enhancing the nutritive value of the plants.

The invention discloses a construction method of gene engineered bacteria for arteannuic acid production, and the construction method comprises the following steps: A) construction of a gene expression module including an artemisinic acid production related gene, an upstream promoter of the artemisinic acid production related gene, and a downstream terminator of the artemisinic acid production related gene; and B) co-transformation of the gene expression module into saccharomyces cerevisiae. The method has the advantages of being simple and fast and efficient, avoids multiple cloning, and does not rely on enzyme digestion sites, many fragments can be together transformed, the homologous recombination efficiency is high, and the method can significantly shorten the construction time of the gene engineered bacteria.

A method for multicopy integration of a target gene to a saccharomyces cerevisiae genome includes: selecting target sequences, designing homologous arm primers in length of 15-90bp on two sides of each cleavage site in the corresponding target sequences to primer front ends of amplification target gene cassettes to synthesize homologous arm loaded primers, and amplifying the target gene cassettesto obtain donor DNA fragments; subjecting transcribed gRNA vectors in corresponding target sequences and the donor DNA fragments to co-transformation into Cas9 nuclease expressing saccharomyces cerevisiae to realize gene integration; removing Cas9 nuclease expression vectors and the transcribed gRNA vectors by a non-resistant flat plate. The method has advantages that the homologous arm primers ontwo sides of each cleavage site is in sequence length of 15-90bp, and by respective adding of the homologous arm primers to upstream and downstream primers of the target gene cassettes, an integratorgene template can be obtained directly through once PCR, so that multi-copy integration of target genes is realized. Compared with an existing method, the method has advantages of low time consumption and simplicity in operation.

The invention discloses a preparation method of Coxsackie virus B3 virus-like particles. The method provided by the invention comprises the following steps: 1) cloning a VP1 gene and a VP4 gene of the Coxsackie virus B3 to a target plasmid 1 to obtain a recombinant expression vector 1; and cloning a VP2 gene and a VP3 gene to a target plasmid 2 to obtain a recombinant expression vector 2; 2) cotransforming the recombinant expression vector 1 and the recombinant expression vector 2 obtained in the step 1 ) to a yeast cell to obtain a recombinant yeast cell expressing the VP1 gene, the VP2 gene, the VP3 gene and the VP4 gene; and 3) cracking the recombinant yeast cell obtained in the step 2 ), and separating to obtain the Coxsackie virus B3 virus-like particles. Experiments show that Coxsackie virus B3 virus-like particles are successfully prepared by the method provided by the invention in the yeast expression system, and can be further used in candidate preventive vaccines and pharmaceutical compositions for virus myocarditis and diabetes type I.

The invention relates to the field of biological technology and discloses a method of increasing the content of tanshinone. According to the method, the 3-hydroxy-3-methylglutaryl coenzyme A reductase gene SmHMGR and the 1-deoxy-D-xylosone-5-phosphate reductase gene SmDXR of salvia miltiorrhiza bunge are used to construct a recombinant vector, and genetic transformation is carried out on leaves of salvia miltiorrhiza bunge so as to obtain hairy roots of salvia miltiorrhiza bunge with transgenic SmHMGR and SmDXR genes. The content of tanshinone in the obtained transgenic hairy roots of salvia miltiorrhiza bunge in the invention substantially increases, and total tanshinone content in a line (HD34) of cotransformed SmHMGR and SmDXR double genes is 5.30 times of that of a comparison hairy root of salvia miltiorrhiza bunge. The invention provides the method for increasing content of tanshinone in the hairy roots of salvia miltiorrhiza bunge, providing a novel high-quality drug source for producing tanshinone in critical clinical demand and having a positive promotion effect in alleviating shortage of drug sources for tanshinone.

The invention discloses a novel method for co-transformation of pichia pastoris through multiple genes. By adopting the novel method, the fact that multiple exogenous genes required to be expressed are connected to the same pichia pastoris expression vector is realized, and in the expression vector, each gene is positioned in an independent expression frame; the fact that multiple genes are efficiently, simultaneously and stably integrated into a pichia pastoris genome is achieved by adopting a built coexpression vector to transform the pichia pastoris. The invention provides the efficient novel method provided for achieving that multiple genes are simultaneously and independently expressed in the same pichia pastoris cell.

The invention belongs to the field of adenovirus vectors and in particular discloses a recombinant adenovirus vector Ad-ING4-OSM and a preparation method thereof. The preparation method comprises the following steps: on the basis of a transfer plasmid pAdTrack-CWV-polyA-promoter, inserting an ING4 segment between BglII and SalI polyclonal sites of the transfer plasmid and inserting an OSM segment between NOtI and HindIII restriction sites of the transfer plasmid so as to prepare a recombinant transfer plasmid pAdTrack-CWV-ING4-poly-A-promoter-OSM; carrying out co-transformation on the recombinant transfer plasmid and a pAsEasy-1 adenovirus skeleton plasmid to BJ5183 competence bacteria with a calcium chloride method; screening, carrying out PacI restriction, and transfecting QBI-293A cells with a liposome; and carrying out multi-time infection and amplification so as to obtain the recombinant adenovirus vector Ad-ING4-OSM. Compared with the Ad-ING4 and Ad-OSM single genomes, the recombinant adenovirus vector Ad-ING4-OSM shows obvious tumor-inhibiting synergy and radiotherapy sensitizing synergistic effect on human laryngocarcinoma Hep-2 cells and nude mouse transplanted tumor thereof and shows superimposed anticancer synergy for inhibiting growth of SPC-A1 pulmonary adenocarcinoma cells and inducing apoptosis.

The invention discloses a method for constructing a target protein interaction network based on high-throughput sequencing. According to the method, a BD-bait and a prey library are co-transformed into a Y2H yeast strain, then culturing in a YPDplus culture medium at 30 DEG C for 4 hours, discarding the supernatant, adding 1mL of sterile water medium for suspension, taking 100muL of suspension bacterial liquid and adding into 10ml of SD/-Leu/-Trp/-His/-Ade liquid culture medium for shaking culture, sampling respectively after shaking culture for 24 hours, 72 hours and 80 hours, the sampled bacterial liquids are used as templates for PCR (Polymerase Chain Reaction) amplification, carrying out agarose gel electrophoresis to test the screening degree of the bacterial liquids, recycling products, carrying out high-throughput sequencing, carrying out gene abundance and difference analysis after de novo assembly, and taking a difference gene as a protein coding gene interacting with a targetgene in the library, so as to preliminarily construct an interaction network of the target protein. The method is also suitable for constructing a target protein interaction network of species without reference genes. The method simplifies the steps of a yeast two-hybrid screening library, and the method is not limited by the number of clones screened once, and can find all interaction proteins of a target protein in a single library.

The invention provides a bacteriophage-assisted cellooligosaccharide transporter continuous directed evolution system and a bacteriophage-assisted cellooligosaccharide transporter continuous directed evolution method. The directed evolution system comprises AV1 plasmid, AV2 plasmid and bacteriophage, and nucleotide sequences of the AV1 plasmid and the AV2 plasmid are respectively shown as SEQ ID NO.7 and SEQ ID NO.8. The invention further provides a preparation method of the bacteriophage-assisted cellooligosaccharide transporter continuous directed evolution system. The method for directed evolution of the cello-oligosaccharide transporter comprises the following steps: co-transforming AV1 plasmid and AV2 plasmid into host bacteria to obtain engineering bacteria for evolution; the phage and the engineering bacteria for evolution obtained in the step 1 are subjected to multiple rounds of evolution culture in a culture medium containing the cellooligosaccharide, in the multiple rounds of evolution culture process, the concentration of the cellooligosaccharide in the culture medium is decreased progressively so as to increase the screening pressure, and the mutant protein is obtained. The invention designs a visual bacteriophage-assisted continuous directed evolution system, the system comprises AV1 plasmid and AV2 plasmid, the visual high-throughput evolution process of the cello-oligosaccharide transporter can be realized by adopting the evolution system to evolve the cello-oligosaccharide transporter, excessive human intervention is avoided, the evolution efficiency is higher and more sensitive, and the method is suitable for large-scale popularization and application. Further, the transport capacity of the LacY on the cellooligosaccharides is greatly improved.

The invention discloses a recombinant strain. The recombinant strain is obtained by co-transforming a recombinant plasmid pETDuet-vgb-manC-B and a recombinant plasmid pCDFDuet-gmd-fcl-wcfB-lacY into escherichia coli. The invention also discloses a construction method of the recombinant strain and application of the recombinant strain in fermentation production of 2'-FL. By designing an RBS sequence and expressing a coding gene vgb of Vitreoscilla hemoglobin VHB at a moderate level, acetic acid secretion of a recombinant JM109 (DE3) strain is successfully inhibited, cytotoxicity caused by VHB is avoided, the concentration OD600 and 2'-FL yield of bacteria obtained through fermentation are greatly improved, and the application value is very high.