CpG-free LacZ

The synthetic LacZ gene is a humanized and CpG-free allele of the LacZ gene. The lacZ gene codes for the enzyme β-galactosidase which catalyzes the hydrolysis of the substrate X-Gal to produce a blue color that is easily visualized under a microscope. This CpG-free gene is ten times more active than the wild-type gene in mammalian cells.

The CpG-free LacZ gene is provided in the expression plasmid pSelect-zeo which is selectable with Zeocin™ in both mammalian and E.coli cells.


Gene: CpG-free LacZ
Synthetic gene encoding β-Galactosidase

289 CpG in native gene


- 20 µg of pSELECT-zeo-LacZ plasmid provided as lyophilized DNA

- 4 pouches of E. coli Fast-Media® Zeo (2 TB and 2 Agar).


First expression cassette

hEF1-HTLV prom is a composite promoter comprising the Elongation Factor-1α (EF-1α) core promoter and the R segment and part of the U5 sequence (R-U5’) of the Human T-Cell Leukemia Virus (HTLV) Type 1 Long Terminal Repeat. The EF-1α promoter exhibits a strong activity and yields long lasting expression of a transgene in vivo. The R-U5’ has been coupled to the EF-1α core promoter to enhance stability of RNA.
lacZΔCpG gene: a humanized and CpG-free allele of the LacZ gene. This CpG-free gene is ten times more active than the wild-type gene in mammalian cells. It can be used for in vitro or in vivo applications.
SV40 pan: the Simian Virus 40 late polyadenylation signal enables efficient cleavage and polyadenylation reactions resulting in high levels of steady-state mRNA.
ori: a minimal E. coli origin of replication to limit vector size, but with the same activity as the longer Ori.

Second expression cassette

CMV enh/prom: The human cytomegalovirus immediate-early gene 1 promoter/enhancer was originally isolated from the Towne strain and was found to be stronger than any other viral promoters.
EM7 is a bacterial promoter that enables the constitutive expression of the antibiotic resistance gene in E. coli.
Zeo: Resistance to Zeocin™ is conferred by the Sh ble gene from Streptoalloteichus hindustanus The Sh ble gene is driven by the CMV enhancer/promoter in tandem with the bacterial EM7 promoter allowing selection in both mammalian cells and E. coli.
ßGlo pan: The human beta-globin 3’UTR and polyadenylation sequence allows efficient arrest of the transgene transcription.


- Kim, D.W. et al. (1990).Use of the human elongation factor 1 alpha promoter as a versatile and efficient expression system.Gene 2: 217-223.
- Takebe, Y. et al. (1988).
SR alpha promoter: an efficient and versatile mammalian cDNA expression system composed of the simian virus 40 early promoter and the R-U5 segment of human T-cell leukemia virus type 1 long terminal repeat.Mol. Cell Biol. 1: 466-472.
- Carswell, S., & Alwine, J.C. (1989).
Efficiency of utilization of the simian virus 40 late polyadenylation site: effects of upstream sequences.Mol. Cell Biol. 10: 4248-4258.
- Yu J & Russell JE. (2001).
Structural and functional analysis of an mRNP complex that mediates the high stability of human beta-globin mRNA.Mol Cell Biol, 21(17):5879-88.



Cat. Codepsetz-lacz
Unit Size20 µg
Price For price or distributor address,
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