Résumé
An expression vector, otherwise known as an expression construct, is usually a plasmid or virus designed for gene expression in cells. The vector is used to introduce a specific gene into a target cell, and can commandeer the cell's mechanism for protein synthesis to produce the protein encoded by the gene. Expression vectors are the basic tools in biotechnology for the production of proteins. The vector is engineered to contain regulatory sequences that act as enhancer and promoter regions and lead to efficient transcription of the gene carried on the expression vector. The goal of a well-designed expression vector is the efficient production of protein, and this may be achieved by the production of significant amount of stable messenger RNA, which can then be translated into protein. The expression of a protein may be tightly controlled, and the protein is only produced in significant quantity when necessary through the use of an inducer, in some systems however the protein may be expressed constitutively. Escherichia coli is commonly used as the host for protein production, but other cell types may also be used. An example of the use of expression vector is the production of insulin, which is used for medical treatments of diabetes. An expression vector has features that any vector may have, such as an origin of replication, a selectable marker, and a suitable site for the insertion of a gene like the multiple cloning site. The cloned gene may be transferred from a specialized cloning vector to an expression vector, although it is possible to clone directly into an expression vector. The cloning process is normally performed in Escherichia coli. Vectors used for protein production in organisms other than E.coli may have, in addition to a suitable origin of replication for its propagation in E. coli, elements that allow them to be maintained in another organism, and these vectors are called shuttle vectors. An expression vector must have elements necessary for gene expression.
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Publications associées (9)
Concepts associés (8)
Vector (molecular biology)
In molecular cloning, a vector is any particle (e.g., plasmids, cosmids, Lambda phages) used as a vehicle to artificially carry a foreign nucleic sequence – usually DNA – into another cell, where it can be replicated and/or expressed. A vector containing foreign DNA is termed recombinant DNA. The four major types of vectors are plasmids, viral vectors, cosmids, and artificial chromosomes. Of these, the most commonly used vectors are plasmids. Common to all engineered vectors are an origin of replication, a multicloning site, and a selectable marker.
Molecular cloning
Molecular cloning is a set of experimental methods in molecular biology that are used to assemble recombinant DNA molecules and to direct their replication within host organisms. The use of the word cloning refers to the fact that the method involves the replication of one molecule to produce a population of cells with identical DNA molecules. Molecular cloning generally uses DNA sequences from two different organisms: the species that is the source of the DNA to be cloned, and the species that will serve as the living host for replication of the recombinant DNA.
Expression vector
An expression vector, otherwise known as an expression construct, is usually a plasmid or virus designed for gene expression in cells. The vector is used to introduce a specific gene into a target cell, and can commandeer the cell's mechanism for protein synthesis to produce the protein encoded by the gene. Expression vectors are the basic tools in biotechnology for the production of proteins. The vector is engineered to contain regulatory sequences that act as enhancer and promoter regions and lead to efficient transcription of the gene carried on the expression vector.
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Cours associés (9)
BIO-203: Integrated labo in Life sciences I
Les étudiants appliquent des techniques de base en biologie moléculaire pour cloner un cDNA d'intérêt dans un plasmide d'expression afin de produire la protéine correspondante dans des cellules de mam
BIO-204: Integrated labo in Life sciences II
Les étudiants appliquent des techniques de base en biologie moléculaire pour cloner un cDNA d'intérêt dans un plasmide d'expression afin de produire la protéine correspondante dans des cellules de mam
CH-319: Experimental biochemistry and biophysics
A semester long experiment where you plan and construct a fluorescent sensor protein starting from DNA bricks. The protein will be expressed in and purified from bacteria, and characterized by biochem
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Séances de cours associées (32)
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Explore les systèmes d'expression des protéines, la conception vectorielle et l'amélioration de la solubilité chez E. coli et d'autres systèmes communs.
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Présente la mécanique, le calcul différentiel et vectoriel, et les perspectives historiques d'Aristote à Newton.
Systèmes de forces III et équilibre 2D
Couvre les systèmes de forces en 3D, l'équilibre en 2D, l'isolation du système, les diagrammes de corps libres, les supports et les articulations.
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