BRAND / VENDOR: Thermo Fisher

Thermo Fisher, C656503, One Shot™ BL21(DE3)pLysE Chemically Competent E. coli

CATALOG NUMBER: C656503

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Product Description

One Shot™ BL21(DE3)pLysE Chemically Competent E. coli One Shot BL21(DE3)pLysE Chemically CompetentE. colicells are ideal for use with bacteriophage T7 promoter-based expression systems such as pRSET and pET. The pLysE plasmid carried by the BL21(DE3)pLysE strain produces higher amounts of T7 lysozyme than pLysS to further reduce basal level expression of the gene of interest. Like pLysS, pLysE confers resistance to chloramphenicol (CamR) and contains the p15A origin for compatibility with plasmids containing the ColE1 or pMB1 origin (i.
e. pUC- or pBR322- derived plasmids). Recombinant proteins that are nontoxic toE. coliare generally expressed at higher levels in BL21(DE3) cells as compared to the BL21(DE3)pLysE strain with tighter expression control. The BL21(DE3)pLysE strain is recommended for use when expressing toxic genes (alternatively, BL21-AI could be considered).
The BL21 (DE3)E. colistrain is one of the most popular host strains to produce recombinant proteins and adapted in research or industrial applications (e.
g., first biopharmaceutical recombinant human insulin). This strain had been engineered to carry the λDE3 lysogen that contains the T7 RNA polymerase gene under control of thelacUV5 promoter. IPTG is required to induce expression of the T7 RNA polymerase cascade system that in turn transcribe the T7 promoter regulated target gene.
BL21(DE3) is a derivative of theE. coliB strain that does not contain the lon protease and is also deficient in the outer membrane protease OmpT. The lack of two key proteases reduces degradation of heterologous proteins expressed in the strains. Additionally, several other strain features make them especially suited for protein production, namely fast growth in minimal medium, a lower acetate production when grown in high glucose media, and the ability to reach high cell density.
One Shot BL21(DE3)pLysE Chemically CompetentE. colioffer:
• Transformation efficiency of >1 x 107cfu/μg control plasmid DNA
• Ion and OmpT protease deficiency reduces degradation of recombinant protein
• IPTG-induciblelacUV5 promoter controls expression of the T7 RNA polymerase
• pLysE (CamR) plasmid for reduced basal expression in uninduced cells
•hsdS mutation allows efficient transformation of unmethylated DNA
• Fast growth in minimal medium and ability to reach high cell densityBL21(DE3)pLysEE. coliare ideal for use with T7 promoter-based expression vectors. Like BL21(DE3)pLysSE. coli, BL21(DE3)pLysE cells carry the lambda DE3 lysogen. In addition, BL21(DE3)pLysE cells contain the pLysE plasmid, which constitutively expresses T7 lysozyme. T7 lysozyme reduces the basal expression of target genes by inhibiting T7 RNA polymerase. The pLysE plasmid in BL21(DE3)pLysE expresses higher levels of T7 lysozyme than the pLysS plasmid in BL21(DE3)pLysS. The BL21(DE3)pLysE strain provides tighter control of T7 RNA polymerase, which is necessary when the recombinant protein to be expressed is toxic.
Easy-to-use One Shot formatBL21(DE3)pLysE Chemically CompetentE. colicells are supplied in the convenient, single-reaction One Shot format. The single-tube, single-use format allows all steps of the transformation protocol, up to plating, to take place in the same tube, thereby helping save time and prevent contamination.
GenotypeF–ompThsdSB (rB–, mB–)gal dcm(DE3) pLysE(CamR)Find the strain and format that you needWe offer otherE. colistrains for protein expression.
For expression of toxic proteins, considerBL21-AI One Shot Chemically CompetentE. coli.
BL21 Star (DE3) and other strains are available inMultiShot formatsfor high throughput applications.
Explorebacterial growthmedia formats.
We offer a variety ofsystems for the expression of recombinant proteinsinE. coli, theChampion pET expression systemprovides the highest level of protein production available in any expression system.
Antibiotic Resistance Bacterial: Yes (Chloramphenicol)
Blue/White Screening: No
Cloning Methylated DNA: No
Contains F' Episome: No
High-throughput Compatibility: Low
Improves Plasmid Quality: No
Improves Protein Stability: Yes (lon,ompT)
Improves RNA Stability: Yes (pLysE)
Preparing Unmethylated DNA: Yes (dcm)
Product Line: One Shot™
Product Type: Chemically Competent Cells
Quantity: 21 x 50 μL
Reduces Recombination: No
Shipping Condition: Dry Ice
T1 Phage - Resistant (tonA): No
Toxic Proteins: No
Transformation Efficiency Level: Subcloning Efficiency (1 x 106to 1 x 107cfu/μg)
Format: Tube
Promoter: T7
Species: E. coli (B)
Unit Size: Each

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