421 results about "Cloning vector" patented technology

A group of modular cloning vector plasmids for the synthesis of a transgene or other complicated DNA construct, by providing a backbone having docking points therein, for the purpose of gene expression or analysis of gene expression. The invention is useful for assembling a variety of DNA fragments into a de novo DNA construct or transgene by using cloning vectors optimized to reduce the amount of manipulation frequently needed. The module vector contains at least one multiple cloning site (MCS) and multiple sets of rare restriction and/or unique homing endonuclease (“HE”) sites, arranged in a linear pattern. This arrangement defines a modular architecture that allows the user to place domain modules or inserts into a PE3 transgene vector construct without disturbing the integrity of DNA elements already incorporated into the PE3 vector in previous cloning steps. The PE3 transgenes produced using the invention may be used in a single organism, or in a variety of organisms including bacteria, yeast, mice, and other eukaryotes with little or no further modification.

The present invention provides an improved helper-dependent vector system for production of high capacity adenoviral cloning vectors. The invention makes use of the DNA size packaging constraints imposed on a pIX-defective Ad virion that prevent such virions from packaging DNA larger than approximately 35 kb. This constraint can be used to develop helper viruses that do not package their DNA. In one embodiment, the invention combines this methodology with the Cre-loxP helper-dependent system to decrease the quantity of contaminating helper virus in vector preparations. In another embodiment the invention is used for vector growth.

The present invention concerns a family of nucleic acids, polypeptides and cloning vectors which direct expression of fusion proteins that can mimic aggregated IgG (AIG) and immune complex function with respect to their interactions with FcγR and which allow for the inclusion and targeting of a second protein domain to cells expressing FcγR. This was accomplished by expressing multiple linear copies of the hinge and CH2 domains (HCH2) of human IgG₁ fused to the framework region of human IgG₁. Convenient restriction sites allow for the facile introduction of additional amino-terminal domains. Methods for treating patients using fusion proteins are also disclosed. The HCH2 polymers described here represent a new strategy in the design of recombinant proteins for the therapeutic targeting of FcγR in autoimmune disorders.

The purpose of the present invention is to provide a diabody-type bispecific antibody, which is characterized by having low immunogenicity and high infiltrating activity into tumor tissues, and by being easily mass-produced at a low cost with use of microorganisms, and by being easily altered in function by means of genetic engineering. The diabody-type bispecific antibody shows a more remarkable effect than the conventional diabody-type bispecific antibodies and chemically synthesized bispecific antibodies even in a very low concentration and in the absence of the super antigen. The present invention is related to a diabody-type bispecific antibody, having a first specificity to a human epidermal growth factor (EGF) receptor and a second specificity to a surface antigen expressed by a cell having phagocytosis or cytotoxic activity, a single-chain polypeptide constituting the antibody or each region contained therein, a nucleic acid encoding the polypeptide, a replicable cloning vector or expression vector comprising the nucleic acid, a host cell transformed with the vector, and a pharmaceutical preparation comprising thereof.

Disclosed herein are cloning vectors which include: (a) a cloning site which permits the cloning of a nucleic acid in defined orientation; (b) at least one cleavage site adjacent to the cloning site, the cleavage site being rarely-occurring in nucleic acids; and (c) a long region which is located on the side of the cloning site opposite to the cleavage site (b), wherein the long region and the region between the cloning site and the cleavage site (b) contain neither the cloning site nor at least two frequently-occurring cleavage sites.

The present invention describes the development of a positive selection vector based on regulatory element modulation, wherein such modulation is achieved via insertional reconstruction or destruction of a regulatory element controlling transcription, translation, DNA replication and termination. A positive selection cloning vector pREM5Tc has been developed based on insertional reconstruction of a regulatory element of a reporter gene. The vector pREM5Tc carries the tetracycline resistance reporter gene with no functional -35 region of its promoter, a regulatory element, thus resulting in no expression of the tetracycline resistance gene. Hence a host cell carrying the vector pREM5Tc is unable to produce the tetracycline resistance gene protein resulting in inhibition of its growth in presence of tetracycline. An E. coli consensus -35 region is recognized as 5'-TTGACA-3' and a primer used in polymerase chain reaction (PCR) carries at its 5' end the sequence 5'-TGTCAA-3', which is the complementary sequence of 5'-TTGACA-3'. The PCR-amplified DNA fragment is ligated to pREM5Tc thus reconstructing the functional promoter of the tetracycline resistance reporter gene. Subsequent transformation of a host cell with the recombinant vector (carrying an insert DNA) results in production of the tetracycline resistance reporter gene protein that confers resistance to tetracycline thus allowing only the recombinants to grow in presence of tetracycline. The positive selection vector pREM5Tc greatly reduces, if not eliminates, the number of exonuclease-generated false positive clones.

The invention discloses a method for acquiring a rhodotorula glutinis phenylalanine deaminase gene. The method comprises the following steps of: extracting RNA (Ribose Nucleic Acid); carrying out inverse transcription; carrying out PCR (Polymerase Chain Reaction) amplification; establishing a cloning vector pUCm-T-pal; and measuring a sequence to obtain a full-length phenylalanine deaminase gene sequence. The invention belongs to the technical field of gene clone. The method disclosed by the invention has the advantages of easiness for operation and higher efficiency and success rate.

The invention relates to preparation of an infectious clone vector of cucumber green mottle mosaic virus (CGMMV) of RNA plant virus, namely, and tobamovirus and analysis of pathogenicity of agrobacterium strain carrying infectious clone of CGMMV. An infectious clone vector of the CGMMV is prepared by fusing the CGMMV with complete sequence into a vector pCB301-CH carrying 35S promoters and ribozyme Rz; the complete sequence of the CGMMV is shown as Seq ID No: 12. The agrobacterium strain can generate massive infectious clones of the CGMMV; the infectious clones only infect plants, rather than insects or animal and human, so that the safety can be ensured.

The present invention relates to methods and materials used to express the HBM protein in animal cells and transgenic animals. The present invention also relates to transgenic animals expressing the high bone mass gene, the corresponding wild-type gene, and mutants thereof. The invention provides nucleic acids, including coding sequences, oligonucleotide primers and probes, proteins, cloning vectors, expression vectors, transformed hosts, methods of developing pharmaceutical compositions, methods of identifying molecules involved in bone development, and methods of diagnosing and treating diseases involved in bone development. In preferred embodiments, the present invention is directed to methods for treating, diagnosing and preventing osteoporosis.

The invention relates to the field of genetic engineering, in particular to preparation of an infectious clone vector of a Pepper mild mottle virus (PMMoV) of RNA (ribonucleic acid) plant viruses and tobacco mosaic viruses, pathogenesis analysis on an infectiously cloned agrobacterium tumefaciens strain with the pepper mild mottle virus and exogenous proteins infectiously cloned and expressed by the aid of the PMMoV. The preparation, the pathogenesis analysis and exogenous proteins have the advantages that genomes of Shanghai bay isolate of the pepper mild mottle virus are constructed onto efficient plant expression vectors pCB301-CH by the aid of a genetic recombination process, the recombinant vectors are transferred into the agrobacterium tumefaciens strain by means of electroporation, and accordingly the virus vector with infection ability can be obtained; the plant expression vectors can be constructed by means of infectious cloning, and the exogenous proteins can be efficiently and stably expressed in host plants; mature systems can be provided for studying structures and functions of the virus genomes and studying interaction between the virus and hosts.

The invention provides a porcine circovirus type 3 (PCV3) genetic engineering subunit vaccine and a preparation method thereof. The method comprises the following steps: S1, constructing a PCV3cap protein gene cloning vector; S2, carrying out splicing and expression screening on a PCV3cap protein gene cloned by S1, and determining a splicing manner; S3, optimizing a codon for expressing the PCV3cap protein gene screened by S2; S4, fusing and connecting a specific gene segment with the upstream of a PCV3cap protein gene N-end gene optimized by S3; S5, constructing expression engineering bacteria by utilizing the gene recombined by S4, and expressing soluble PCV3cap protein by adopting the expression engineering bacteria, wherein the subunit molecular weight is about 25 kDa; purifying the soluble PCV3cap protein; S6, obtaining purified protein which is circovirus sample particles with the diameter of 17.74 nm to 18.20 nm under an electron microscope, and adding an immunoenhancer into thepurified expression protein to prepare the vaccine. After experiment pigs are immunized by utilizing the vaccine, an antibody, which resists the PCV3cap protein, can be detected, and the PCV3 virus loading amount in blood serum of the experiment pigs can be remarkably reduced in a anti-virus protection experiment; the vaccine has a remarkable protection effect on the experiment pigs.

In one aspect, the present invention relates to a method for selectively capturing and/or amplifying exons or targeted genomic regions from biological samples. In one embodiment, the method includes the steps of obtaining DNA templates for the targeted genomic region, cloning the DNA templates into cloning vectors to form template DNA clones, constructing libraries of the template DNA clones that cover at least the targeted genomic regions, generating hybridization probes from the DNA template clones in the libraries, capturing the targeted genomic DNA regions by hybridizing the targeted genomic DNA samples (fragmented either mechanically or enzymatically) with the generated hybridization probes, and eluting the captured genomic fragments by using conditions for releasing and separating the bound DNA from the hybridization probes.

The invention relates to a cloning vector and preparation and application thereof and discloses a cloning vector pUC57-ccdB which is a modified vector with ccdB genes inserted at multiple cloning sites of a pUC57 vector, wherein the ccdB genes have blunt-end restriction enzyme digested recognition sites. By means of the lethal effect of CcdB protein on escherichia coli not containing F plasmids, the ccdB genes having the restriction enzyme Sma I digested sites are inserted on the pUC57 plasmids through the molecular biological technology to obtain the vector pUC57-ccdB. Blunt ends are generated through Sma I digestion and are connected with the genes needing to be cloned so that insertion of the genes needing to be cloned can be achieved. Meanwhile, bacterial colonies with empty vectors are avoided. The cloning vector plays an important role in the fields of molecular biology and genetic engineering.

Novel methods and novel industrial unicellular microorganism strains, particularly industrial Bacillus strains, are provided for enhanced production of endogenous and exogenous polypeptides. Cloning vehicles containing the gene expressing the polypeptide of interest are introduced into a compatible host. Transformed hosts harboring the introduced vehicle in a stable way by integration of the vehicle into the host cells chromosome are selected. Efficient transfer of the vehicle containing the gene of interest is achieved, with the resulting industrial strain transformants being effective, stable producers of the desired polypeptide product.

The invention provides a traceless cloning and reorganizing method by means of activity of exonuclease, which includes: adding DNA (deoxyribonucleic acid) sections with the length of 10-30bp identical with that of sequence at two ends of an insertion site of a cloning carrier to two ends of a target gene respectively, then reorganizing with the carrier DNA under the action of the exonuclease, manly during preparing sections of the target gene, adding the DNA sections with the length of 10-30bp identical with the sequence of the two ends of the insertion site of the cloning carrier respectively to the 5' ends of an amplimer. The traceless cloning and reorganizing method has the advantages that (1) enzyme digestion for the target gene or the DNA sections is omitted, enzyme digestion sites inside the target gene or the DNA sections can be ignored, and the target gene or the DNA sections are free of limits by limit incision enzyme identification sites on the carrier; and (2) unnecessary sequence is avoided introducing when the target genes and the DNA sections are connected to the carrier, namely the traceless cloning.

The invention relates to a condon optimized African swine fever virus P54 gene and a nucleic acid vaccine based on the gene, wherein the nucleic acid vaccine consists of an eukaryotic expression vector and the condon optimized African swine fever virus P54 gene. The nucleic acid vaccine is constructed through the following steps of optimizing the condon of P54protein, designing a specific primer, transferring sequence of the artificially synthesized African swine fever virus P54 gene into a cloning vector and recombining the purified P54 gene into the eukaryotic expression vector. The nucleic acid vaccine can be used for preventing the occurrence of African swine fever and is a powerful tool for solving the immune prevention and control of the African swine fever. Compared with the traditional vaccines, the nucleic acid vaccine has the advantages of small quantity, security, long-term effect, stability and convenience in operation when reaching same immune effect.

The present invention relates to the development of a positive selection vector based on insertional reconstruction of a reporter gene or of a regulatory gene controlling the expression of a reporter gene. The cloning vector carries a reporter gene or a regulatory gene with a mutation rendering the reporter or the regulatory gene protein functionally inactive. A primer carrying a nucleic acid sequence that corrects the mutation is used during PCR amplification of a targeted nucleic acid sequence, and the amplified DNA fragment is then ligated to the said vector thus reconstructing the wild-type reporter or regulatory gene.

The invention provides a preparation method of a water-soluble human collagen VI polypeptide, which comprises the following steps: linking coding genes of the human collagen VI polypeptide into a cloning vector, transforming Escherichia coli, constructing engineering bacteria, inducing the engineering bacteria to express the human collagen VI polypeptide, and respectively establishing an engineering bacteria fermentation process and a target protein purification process. The protein electrophoretic analysis and activity verification indicate that the molecular weight of the human collagen VI polypeptide is 46kDa, and the human collagen VI polypeptide is soluble in supernatant, has favorable water solubility and exists in the form of a monomer or polymer. The human collagen VI polypeptide in vitro can protect cells from ultraviolet injury, and has the functions of diminishing inflammation and moistening. The invention realizes a large-scale gene engineering preparation method of a water-soluble human collagen VI polypeptide.

The invention provides a gene of coded beta-glucosaccharase, which is called Unbgl1B and is obtained by constructing Metagenome DNA library of uncultured microorganisms of alkality contaminated soil and by the detecting and screening method of the activity of the beta-glucosaccharase of clone library, so as to be one of the following nucleotide sequences: 1) DNA sequences and partial sequence thereof in sequence 1 of a sequence table; 2) DNA sequences having more than 80% of homoeology compared with the DNA sequences defined by the sequence 1 of the sequence table. The DNA in the sequence 1 of a sequence table is DNA sequences of a pGEM-3Zf(+) part of a cloning vector and DNA of exogenetic uncultured microorganisms cloned on the vector, and the exogenetic DNA segment consists of 838 basic groups; the GC content of the gene is 54.3%. The gene is used for producing the beta-glucosaccharase, so as to dissociate cellobiose into single glucose molecule.

The invention provides a primer group for identifying a male parent and a female parent of tachysurus fulvidraco and leiocassis longirostris hybrid species. The primer group comprises a primer pair for amplifying COI genes and a primer pair for amplifying an ITS sequence, wherein the primer pair for amplifying COI genes consists of a primer COIF and a primer COIR; the primer pair for amplifying an ITS sequence consists of a primer ITSF and a primer ITSR. The invention also provides a kit which is for identifying the male parent and the female parent of tachysurus fulvidraco and leiocassis longirostris hybrid species and comprises the primer group. The kit also comprises any one or more of the following reagents: a buffer solution for PCR, dNTP, heat-resistant DNA polymerase, a cloning vector, a DNA ligase, and a buffer solution for ligation. The invention also provides a method for identifying the male parent and the female parent of tachysurus fulvidraco and leiocassis longirostris hybrid species. The primer group, the kit or the method can be used for accurately identifying the male parent and the female parent of the tachysurus fulvidraco and leiocassis longirostris hybrid species, thus effectively managing a breeding plan and monitoring negative influence thereof, and has great significance in sustainable development of aquaculture industry.