pRevTet-Off四环素调控系统

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载体订购信息

产品编号
GS-1612
产品名称
pRevTet-Off 四环素调控系统
市场价格
￥ 1000
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载体基本信息

载体名称:
pRevTet-Off
载体类型:
四环素调控系统
克隆方法:
/
拷贝类型:
/
载体抗性:
Ampicillin (氨苄青霉素)
筛选标记:
新霉素
载体大小:
7847 bp 点击查看完整序列
启动子:
CMV
测序引物5’:
/
测序引物3’:
/
报告基因:
/

载体图谱展示

载体图谱

载体说明

pRevTet-Off? is a retroviral vector expressing the tetracycline-controlled transactivator (tTA) from the CMV promoter. This vector is derived from pLNCX, a retroviral vector created using elements of Moloney murine leukemia virus (MoMuLV) and Moloney murine sarcoma virus (MoMuSV) as described (1). tTA is a fusion of amino acids 1–207 of the tet repressor (TetR) and the negatively charged C-terminal activation domain (130 amino acids) of the VP16 protein of Herpes Simplex Virus. The 5' viral LTR controls expression of the transcript that contains Y+ (the extended viral packaging signal), and the neomycin resistance gene (Neor) for antibiotic selection in mammalian cells. tTA is derived from vectors described previously (2, 3). pRevTet-Off also includes the E. coli Ampr gene for antibiotic selection in bacteria.

载体应用

pRevTet-Off can be used to establish stable Tet-Off cell lines via retrovirus-mediated gene transfer (4). Retroviral gene transfer allows the highly efficient transduction of virtually all dividing cell types. The RevTet? Systems are also suitable for establishing transgenic animals. In combination with the pRev-TRE retroviral expression vector, a gene of interest can be inducibly expressed at high levels in response to varying concentrations of tetracycline (Tc) or Tc derivatives such as doxycycline (Dox). tTA binds to the Tet-response element (TRE), thus activating transcription in the absence of Tc or Dox. As Tc or Dox is added to the culture medium, transcription from the inducible promoter is turned off in a highly dose-dependent manner. pRevTet-Off lacks the viral genes gag, pol, and env, which are supplied by the packaging cell line. It can be transfected into a high titer packaging cell line and thereby mediate production of infectious, replication-incompetent retroviral particles (1, 5–6).The transcript produced by the pRevTet-Off construct is recognized by the viral structural proteins expressed in a packaging cell line and packaged into infectious retroviral particles. Because the RNA transcript packaged in these particles does not contain the viral genes, it cannot replicate in the target cells that it infects.

The level of induction in cell populations infected with this vector depends on the efficiency of infection, the site of integration, and the titer of the virus. Viral supernatants with titers >105 cfu/ml should be produced to achieve high-level induction.

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