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Inducible Systems

Products >  Inducible_Systems >  Tetracycline-Inducible_Expression >  Tet-On_3G_EF1-Alpha_Promoter

EF1-Alpha Promoter Versions of Tet-On 3G

EF-1 alpha promoter versions of the Tet-On 3G Tetracycline Inducible Expression System  provide for consistent long-term expression of the Tet-On 3G transactivator, even in cell types known for their tendency to silence a CMV promoter over time, such as hematopoietic cells and stem cells. This means that in these cell types long term tetracycline inducible expression can be achieved. The systems contain the same pTRE3G vectors as our standard Tet-On 3G Systems that generate the lowest possible background expression; however the Tet-On 3G transactivator is expressed from an EF1-alpha promoter instead of a CMV promoter. The EF-1 alpha promoter in these systems is derived from the human EEF1A1 gene that expresses the alpha subunit of eukaryotic elongation factor 1.

We tested the EF-1 alpha version in Jurkat cells, a cell line known to show reduced expression and clonal variation in expression from CMV-based vectors. When expressing the Tet-On 3G transactivator protein from the EF-1 alpha promoter, 83% of the Jurkat Tet-On 3G clones showed strong inducible expression and 33% demonstrated very high inducibility (greater than 2,000-fold). Such levels of control are not possible when using previous versions of the Tet-On system for this cell line.

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  • View kit components
  • Tetracycline transactivator, Tet-On 3G, is expressed from an EF1-alpha promoter
  • Very low background expression
  • High induced expression


  • Inducible expression in cell types known to silence CMV promoters, such as hematopoietic cells and stem cells

Additional Information

Please see the product's Certificate of Analysis for information about storage conditions, product components, and technical specifications. Please see the Kit Components List to determine kit components. Certificates of Analysis and Kit Components Lists are located under the Documents tab.


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