How do I make DH5 alpha competent cells?
1) Inoculate an LB culture with DH5α cells (directly from the frozen stock without thawing) and grow overnight at 37 °C. 2) Add 5 mL of this overnight culture to 500 mL of SOB medium in a 2 L flask. 3) Grow cells to an OD600 between 0.4 or 0.6. Do not exceed 0.6.
Why are DH5 alpha competent cells?
MAX Efficiency DH5α Competent Cells are a well-known, versatile strain that can be used in many everyday cloning applications. In addition to supporting blue/white screening, recA1 and endA1 mutations in DH5α cells increase insert stability and improve the quality of plasmid DNA prepared from minipreps.
Is DH5 Alpha Dam positive?
Yes, DH5a is dam+ (see http://openwetware.org/wiki/E._coli_genotypes) and yes it blocks your BsaBI digestion.
Is DH5 Alpha ampicillin resistance?
Yes, DH5 alpha carries no resistance to antibiotics. It means it should be manipulated very carefully, using stringent asseptic conditions.
Can I use DH5 Alpha for protein expression?
BL21 and DH5 Alpha are two genetically engineered E. coli cells currently used for protein expression and plasmid transformation, respectively.
What are Electrocompetent cells?
Electrocompetent cells are made competent using an electrical pulse from an electroporator to create temporary pores (poration) in the cell membrane of either prokaryotic or eukaryotic cells.
Can DH5 alpha be used for protein expression?
The reason DH5a does not typically carry this modification is that it is poor for protein expression, since it still has the lon protease, which tends to degrade expressed proteins. The BL21 strain is knocked out for this and other proteases.
Are DH5 alpha cells DAM+?
Yes, DH5a is dam+ (see http://openwetware.org/wiki/E._coli_genotypes) and yes it blocks your BsaBI digestion. You have to subclone vector into dam- cells.
What are electelectromax™ dh5α-e™ competent cells?
ElectroMAX™ DH5α-E™ Competent Cells are derived from the DH5α™ strain and are suitable for transformation by electroporation. They may be used in procedures requiring high transformation efficiencies, such as generation of cDNA libraries or in transformations with limited input DNA.
What are DH5 α competent cells?
Subcloning Efficiency™DH5α Competent Cells are recommended for routine subcloning into plasmid vectors and are notsuitable for the generation of cDNA libraries. The lacZ∆M15 marker provides α-complementation of the β-galactosidase gene, allowing blue/white screening of colonies on plates containing X-gal or Bluo-gal. DH5 α™
What is K-12 derived DH5α?
One of the most common laboratory E. coli strains used to maintain and amplify small plasmid DNA is K-12 derived DH5α. Typical DNA assembly and cloning procedures involve as their last step transformation of the constructed plasmid into competent DH5α cells.
What is the 5 minute transformation protocol for E coli?
5 Minute Transformation Protocol 1. Thaw a tube of DH5 alpha Competent E. coli cells on ice. 2. Add 1-5 µl containing 1 pg-100 ng of plasmid DNA to the cell mixture. Carefully flick the tube 4-5 times to mix cells and DNA. Do not vortex. 3. Place the mixture on ice for 2 minutes. Do not mix. 4. Heat shock at exactly 42°C for exactly 30