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Invitrogen pGene v5-His 說明書

2013-7-22  閱讀(2476)

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GeneSwith 哺乳動(dòng)物誘導(dǎo)系統(tǒng)

Invitrogen  pGene v5-His 

 

 

產(chǎn)品參數(shù): 

Mammalian Selection:Zeocin
Constitutive/Inducible:Inducible
Expression Level Tightly controlled (activate with mifepristone)
Sequencing Primer pGene Fwd 
Sequencing Primer Sequence:5'd[CTGCTATTCTGCTCAACCT]3' 
Protein Tags:6X His,V5

載體抗性: 
氨芐青霉素(Ampicillin)
載體描述: 

Switch-On Expression from the Lowest Basal Levels

The GeneSwitch™ System for inducible mammalian expression is ideal for experiments that require the absolute lowest uninduced expression levels. The expression vector pGene/V5-His provides a minimal promoter, GAL4-E1b, consisting of the binding sites for the yeast Gal4 DNA binding protein followed by the TATA sequence from the Adenovirus E1b promoter. Without additional factors, the GAL4-E1b promoter is transcriptionally silent.

To activate transcription from the GAL4-E1b promoter, the GeneSwitch™ regulatory protein is expressed from a minimal TK promoter on the pSwitch vector. The GeneSwitch™ protein has three functional domains:

  1. Gal4 DNA Binding Domain (Gal4-DBD) to bind the regulatory protein to the GAL4-E1b promoter
  2. Truncated human Progesterone Receptor Ligand Binding Domain (hPR-LBD) that undergoes a conformational change when it binds the progesterone antagonist, mifepristone
  3. Transcription activation domain from the NFØB transcription factor p65 (p6D) to activate transcription from the silent GAL4-E1b promoter

In the absence of mifepristone, the conformation of the hPR-LBD region prevents the GeneSwitch™ regulatory protein from activating transcription from the GAL4-E1b promoter. When mifepristone is added and binds the hPR-LBD region, the GeneSwitch™ regulatory protein assumes a conformation that permits it to stimulate transcription from the GAL4-E1b promoter.

Induction of the GeneSwitch™ System leads to activation of the gene of interest on the vector pGene/V5-His. In addition, four Gal4 binding sites upstream of the minimal HSV TK promoter on pSwitch can bind the pSwitch regulatory protein. Therefore, adding mifepristone up-regulates production of the regulatory protein. The increased levels of the GeneSwitch™ regulatory protein result in induction of the gene of interest from pGene/V5-His to levels that can approach those of viral promoters.

The GeneSwitch™ Kit offers exceptionally low uninduced and high induced expression levels in mammalian cells. The system provides the expression vector pGene/V5-His with the minimal, synthetic GAL4-E1b promoter that is transcriptionally silent until activated. The GeneSwitch™ regulatory protein binds the GAL4-E1b promoter to activate transcription upon the addition of mifepristone. In addition, the GeneSwitch™ protein upregulates its own expression, leading to amplified expression of the gene of interest from pGene/V5-His. pGene/V5-His offers several features that facilitate expression analysis and purification of recombinant proteins in mammalian cells:

  1. C-terminal V5 epitope tag for detection with Anti-V5 Antibodies
  2. C-terminal polyhistidine (6xHis) tag for rapid purification with nickel-chelating resin and detection with Anti-His(C-term) Antibodies
  3. The Zeocin resistance gene for effective selection in both mammalian cells and E. coli

 

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