Thermo Scientific™ BL21(DE3) Competent Cells

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.

• 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: >1x107 cfu/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 included
• Applications:  BL21(DE3) Competent Cells are suitable for high-level T7 expression of recombinant proteins
• Genotype: F– ompT hsdSB (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).

Description

Chemically Competent

Contains F' Episome

Lacks F' Episome

Content And Storage

Dry Ice (-80°C)

Bacterial or Yeast Strain

BL21(DE3)

Species

E. coli

Format

Tube

For Use With (Application)

Cloning

Quantity

20 Reactions (10 x 100 μL)