Thermo Fisher, EC0114, BL21(DE3) Competent Cells

BL21(DE3) Competent Cells Thermo Scientific BL21(DE3) Competent Cells are suitable for the expression of non-toxic heterologous genes. The strain contains the lambda DE3 prophage that carries the gene for T7 RNA polymerase under control of a lacUV5 promoter, allowing expression of the T7 RNA polymerase to be induced with IPTG. BL21(DE3) is an E. coli B strain and does not contain the lon protease. It is also deficient in the outer membrane protease OmpT. The lack of these two key proteases reduces degradation of heterologous proteins expressed in the cells.
• High transformation efficiency: >1x107cfu/μg pUC19 DNA
• Specifically constructed for high-level expression of recombinant proteins
• Genetic markers that minimize RNA and protein degradation
• Convenient two reactions per vial packaging
• S.
O.
C. Outgrowth medium includedApplicationsBL21(DE3) Competent Cells are suitable for high-level T7 expression of recombinant proteins.
GenotypeF–ompThsdSB(rB–, mB–)gal dcm(DE3)Note: Not suitable for maintenance of expression plasmids. Use DH10B or DH5α competent cells that do not carry the gene for T7 RNA polymerase for plasmid DNA propagation (Cat. Nos. EC0112, EC0113).
Product Type: Competent Cell
Efficiency: High Efficiency (>1x10^7 cfu/μg pUC19 DNA)
Cell Type: Chemically Competent
Cloning Methylated DNA: Yes
Bacterial or Yeast Strain: BL21(DE3)
Blue/White Screening: No
Shipping Condition: Dry Ice
Species: E. coli
Promoter: LacUV5
Format: Tube
Product Line: Thermo Scientific™
Quantity: 10 x 100 μL
Unit Size: Each