What is pBAD vector?
The pBAD vector system is a reliable and controllable system for expressing recombinant proteins in bacteria. This system is based on the araBAD operon, which controls E. coli L-arabinose metabolism.
What kind of promoter is pBAD?
PBAD (systematically araBp) is a promoter found in bacteria and especially as part of plasmids used in laboratory studies. The promoter is a part of the arabinose operon whose name derives from the genes it regulates transcription of: araB, araA, and araD.
What is the function of pBAD?
The pBAD expression system allows tightly controlled, titratable expression of your protein through the regulation of specific carbon sources such as glucose, glycerol, and arabinose. pBAD is ideal for expressing toxic proteins and optimizing protein solubility in E. coli.
What is the function of the araBAD promoter?
Use in protein expression system The L-arabinose operon has been commonly used in protein expression system, as the araBAD promoter can be used for producing targeted expression under tight regulation.
What is the difference between dh5alpha and BL21?
The key difference between BL21 and DH5 Alpha is that BL21 is a protease deficient genetically engineered competent E. coli cell used primarily for protein expression, while DH5 Alpha is a genetically engineered competent E. coli cell with recA1 mutation used primarily for plasmid transformation.
What does the DE3 in BL21 DE3 designate about the cells?
The DE3 designation means that respective strains contain the λDE3 lysogen that carries the gene for T7 RNA polymerase under control of the lacUV5 promoter.
What is the best vector for BL21 AI cells?
It produces 3–10 times higher protein yield, is compatible with T7 regulated E. coli vectors that contain a functional lac operon and BL21 (DE3) strains, is simple to follow, and eliminates OD monitoring/induction steps. I am using a Champion™ pET vector with the BL21 AI cells.
What is BL21 competent E coli?
BL21 Competent E. coli is a widely used non-T7 expression E. coli strain and is suitable for transformation and protein expression. This strain does not express the T7 RNA Polymerase. CAUTION: This product contains DMSO, a hazardous material.
How does the PBAD vector induce gene expression?
Afterwards, expression of the gene of interest can be induced by the addition of L-arabinose to the medium. Our pBAD vectors contain the bidirectional araBAD promoter, which drives expression of both the gene of interest and the regulatory protein AraC.
What is the function of Arac in PBAD vector?
The regulatory elements of the E. coli arabinose operon are used in the pBAD vectors to precisely modulate heterologous expression levels, allowing optimization of the yields of the protein of interest. The regulatory protein, AraC, is provided on the pBAD vector backbone, allowing for regulation of pBAD.