222 results about "Structural gene" patented technology

A method for expressing insecticidal protein structural genes in plant genomes is provided. In the preferred embodiments this invention comprises placing a structural gene for the Bacillus thuringiensis crystal protein under control of a plant or a T-DNA promoter and ahead of a polyadenylation site followed by insertion of said promoter/structural gene combination into a plant genome by utilizing an Agrobacterium tumefaciens Ti plasmid-based transformation system. The modified Ti plasmid is then used to transform recipient plant cells. Also provided are the plants and tissues produced by this method and bacterial strains, plasmids, and vectors useful for execution of this invention.

Chimeric flaviviruses that are avirulent and immunogenic are provided. The chimeric viruses are constructed to contain amino acid mutations in the nonstructural proteins of a flavivirus. Chimeric viruses containing the attenuation-mutated nonstructural genes of the virus are used as a backbone into which the structural protein genes of a second flavivirus strain are inserted. These chimeric viruses elicit pronounced immunogenicity yet lack the accompanying clinical symptoms of viral disease. The attenuated chimeric viruses are effective as immunogens or vaccines and may be combined in a pharmaceutical composition to confer simultaneous immunity against several strains of pathogenic flaviviruses.

Protein synthesis inhibitor resistance genes (typified by a cycloheximide resistance gene) are capable of imparting resistance to a protein synthesis inhibitor (typified by cycloheximide) to animal cells sensitive to the inhibitor. The genes have a sequence mutated by substitution in a gene encoding a ribosome-constituting protein derived from an animal. The genes may be placed in recombinant vectors, including expression vectors containing the gene together with a foreign protein structural gene.

The invention relates to the molecular medicine and gene treating field, in particularly, a gene segment which is new, cell target special, and can eliminate replication ability and synthesizing ability of nucleocapsid protein from source and clean the pollution protein. The gene segment is composed of a recombinant aden-associated virus vector helper plasmid non-structure and/or structure gene, and at least one copy cell special microRNA target sequence which can be used in multiple cell strains directly, and also can be used for constructing recombinant aden-associated virus plasmid and vector to prepare medicine, basic medicine and clinic gene treating.

The invention belongs to the field of gene engineering, and discloses a method for production of L-4-hydroxyproline by using recombinant escherichia coli fermentation. Recombinant escherichia coli is constructed by the following method: according to a published proline-4-hydroxylase gene and tryptophan promoter sequence, first optimally designing a tryptophan tandem promoter and a proline-4-hydroxylase structure gene, then after the total gene synthesis of the tryptophan tandem gene promoter and the proline-4-hydroxylase structure gene, connecting the promoter and the structure gene to pAMP plasmid to construct recombinant plasmid pAMP-P2trp-Hyp for overexpression of proline-4-hydroxylase. The invention also discloses the application of the escherichia coli in the production of the 4-hydroxyproline, the shake flask fermentation results show that the 4-hydroxyproline prepared by the recombinant escherichia coli has a yield reached 0.31g / L, and suggest that the recombinant escherichia coli has good industrial development prospects.

Zinc finger proteins of the Cys₂His₂ type represent a class of malleable DNA binding proteins which may be selected to bind diverse sequences. Typically, zinc finger proteins containing three zinc finger domains, like the murine transcription factor Zif268 and the human transcription factor Spl, bind nine contiguous base pairs (bp). To create a class of proteins which would be generally applicable to target unique sites within complex genomes, the present invention provides a polypeptide linker that fuses two three-finger proteins. Two six-fingered proteins were created and demonstrated to bind 18 contiguous bp of DNA in a sequence specific fashion. Expression of these proteins as fusions to activation or repression domains allows transcription to be specifically up or down modulated within cells. Polydactyl zinc finger proteins are broadly applicable as genome-specific transcriptional switches in gene therapy strategies and the development of novel transgenic plants and animals. Such proteins are useful for inhibiting, activating or enhancing gene expression from a zinc finger-nucleotide binding motif containing promoter or other transcriptional control element, as well as a structural gene or RNA sequence.

A disease treatment is provided by controlling the expression of a protein induced by a heat shock factor.

The novel compound benzo-1,3-dioxole provides an inhibitor of HSF activity or an inhibitor of inducing the production of a protein regulated by HSF, which inhibits the activity of a heat shock factor, a transcriptional regulatory factor, thereby in turn inhibiting transcription of a structural gene having a heat shock element sequenc in the gene region for transcriptional regulation into RNA, and thus inhibiting translation of the gene into a protein, and resulting in inhibition of inducing production of RNA or protein encoded by the gene. It also provides a drug for treating or preventing cancer through thermotherapy and a drug for treating or preventing stress diseases such as depression.

A method for modifying structural gene sequences to enhance the expression of the protein product is disclosed. Also disclosed are novel structural genes which encode insecticidal proteins of B.t.k. HD-1, B.t.k. HD-73, B.t. tenebrionis, B.t. entomocidus, 2 protein of B.t.k. HD-1, and the coat protein of potato leaf roll virus.

The invention discloses a DNA (Deoxyribose Nucleic Acid) with constitutive promoter activity, application of the DNA and a pichia pastoris expression vector. The DNA has a base sequence as shown in SEQ No.1 (Sequence Number); and the application of the DNA relates to the application of the DNA in construction of the pichia pastoris (Pinchia Pastoris) expression vector. The DNA disclosed by the invention has the constitutive promoter activity, and can activate the transcription of a downstream structural gene without an inductor; the transcriptional activity shows little change in four different culture mediums, namely, ethanol, methanol, glucose and glycerol; the promoter activity is efficient, and the efficiency of the initiation transcription is four times more than the pichia pastoris GAPDH (Reduced Glyceraldehyde-phosphate Dehydrogenase) promoter. The pichia pastoris expression vector, constructed by the DNA disclosed by the invention, can efficiently express the extrinsic protein without methanol induction, and the efficiency of expressing the extrinsic protein (Enhanced Green Fluorescent Protein) is about 6 to 8 times that of the expression system of the GAPDH promoter and 1.5 to 2 times that of the expression system of a TEF1 (Transcription Enhancer Factor 1) promoter.

The present inventors have developed a culture system for genotype 3a, which has a high prevalence worldwide. Since intergenotypic recombinant genomes exploiting the replication characteristics of JFH1 will be a valuable tool for the genotype specific study of the replaced genes and related therapeutics, the present inventors constructed a genotype 3a/2a (S52/JFH1) recombinant containing the structural genes (Core, E1, E2), p7 and NS2 of strain S52 and characterized it in Huh7.5 cells. S52/JFH1 and J6/JFH viruses passaged in cell culture had comparable growth kinetics and yielded similar peak HCV RNA titers and infectivity titers. Direct genome sequencing of cell culture derived S52/JFH1 viruses identified putative adaptive mutations in Core, E2, p7, NS3 and NS5A; clonal analysis revealed, that all genomes analyzed exhibited different combinations of these mutations. Finally, viruses resulting from transfection with RNA transcripts of five S52/JFH1 recombinant containing these combinations of putative adaptive mutations performed as efficiently as J6/JFH viruses in Huh7.5 15 cells and were all genetically stable after viral passage. In conclusion, the present inventors have developed a robust and genetically stable cell culture system for HCV genotype 3a.

The invention relates to a method for applying establishment of gene recombination mobile fermentation monad to alcoholic fermentation. The microorganism is obtained by leading an operon capable of expressing in the mobile fermentation monad, wherein the operon consists of a sequence for coding a promoter and a sequence for coding a structure gene and comprises a sequence coding at least one promoter, and the sequence of the promoter can be identified by the mobile fermentation monad and regulates expression of at least more than one structural gene. The operon comprises a sequence for coding at least one heat shock protein HSP and is used for enhancing the survivability of the mobile fermentation monad in an adverse environment and increasing the temperature of alcoholic fermentation; the operon comprises a sequence for coding at least one lysine anabolism enzyme yfdz so that the mobile fermentation monad can automatically synthesize lysine; the operon comprises a sequence for coding at least one methionine anabolism enzyme metB so that the mobile fermentation monad can automatically synthesize methionine used for lowering the nutrition requirement of the mobile fermentation monad for cultures; and the operon also comprises a sequence for coding a structural gene, which ensures that the mobile fermentation monad can utilize at least one pentaose to generate. The operon enters the mobile fermentation monad in a plasmid transforming way or integrated with the genome of the mobile fermentation monad to obtain a transporton recombinant in a transporton way. The mobile fermentation monad obtained by gene engineering enhances the survivability in an adverse environment, can be fermented to generate the alcohol under higher temperature, obviously lowers the nutrition requirement for the cultures, can utilize the pentaoses to generate the alcohol and still stably retains the characteristics after transfer of culture for 200 times.

The present inventors developed hepatitis C virus 1a/2a and 1b/2a intergenotypic recombinants in which the JFH1 structural genes (Core, E1 and E2), p7 and NS2 were replaced by the corresponding genes of the genotype Ia reference strain H77C or TN or the corresponding genes of the genotype Ib reference strain J4. Sequence analysis of recovered 1a/2a and 1b/2a recombinants from 2 serial passages and subsequent reverse genetic studies revealed adaptive mutations in e.g. p7, NS2 and/or NS3. In addition, the inventors demonstrate the possibility of using adaptive mutations identified for one HCV isolate in generating efficient cell culture systems for other isolates by transfer of mutations across isolates, subtypes or major genotypes. Furthermore neutralization studies showed that viruses of e.g. genotype 1 were efficiently neutralized by genotype Ia, 4a and 5a serum, an effect that could be utilized e.g. in vaccine development and immunological prophylaxis. The inventors in addition demonstrate the use of the developed systems for screening of antiviral substances in vitro and functional studies of the virus, e.g. identification of receptors required for HCV entry

The present inventors developed hepatitis C virus 6a/2a intergenotypic recombinants in which the JFH1 structural genes (Core, E1 and E2), p7 and the complete NS2 were replaced by the corresponding genes of the genotype 6a reference strain HK6a. Sequence analysis of recovered 6a/2a recombinants from 2 transfection experiments and subsequent reverse genetic studies revealed adaptive mutations in E1 and E2. Conclusion: The developed 6a/2a viruses provide a robust in vitro tool for research in HCV genotype 6, including vaccine studies and functional analyses.

The application discloses a method for regulating and controlling the expression level of saccharomyces cerevisiae genes by using terminators and belongs to the field of bioengineering. The method comprises the following steps: firstly, constructing a terminator verification carrier containing a promoter and a reporter gene; analyzing sequence information of 3'-UTR (Untranslated Region) terminators on the downstreams of saccharomyces cerevisiae structural genes by bioinformatics, amplifying the terminators and connecting the amplified terminator with the terminator verification carrier to form a terminator library. By replacing or changing the terminators in a gene expression cassette, regulation and control of the expression level of target genes or pathways can be realized from the transcription and translation levels; the method provides an efficient fine regulation and control means for optimizing a metabolic pathway of yeast, and facilitates efficient and balanced expression of exogenous genes or pathways in yeast cells.