One Shot® BL21(DE3)pLysE Chemically Competent E. coli

Catalog number: C656503

Invitrogen™  Related applications: Protein Expression

Error loading your content!

  Catalog number
Select a plan
Unit size
Price ({{currency}}) Your price ({{currency}}) Availability Qty
{{product.sku}} {{product.sku}}
also known as {{product.formattedSku}} 
{{subscriptionDetails.selectedRatePlan.billingPeriod}} {{subscriptionDetails.selectedRatePlan.billingPeriod}} {{product.availability.message}}
Pro add-ons

Your on-site stock

›› {{supplyCenter.scName}}({{scProduct.stockOnHand}} In stock)
›› {{supplyCenter.scName}}(Out of stock)
›› {{supplyCenter.scName}}
This item is not currently available on-site. Depending on your Supply Center settings you may be able to add the item to cart above else use the Order Non-Stocked Items' tab on the Supply Center home page.
Back to top


BL21(DE3)pLysE E. coli are ideal for use with T7 promoter-based expression vectors. Like BL21(DE3)pLysS E. coli, BL21(DE3)pLysE 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.
For Research Use Only. Not for use in diagnostic procedures.


Competent Cell Type: Chemically Competent
Species: E. coli
Format: One Shot
Blue-White Screening: No
Bacterial or Yeast Strain: BL21(DE3), BL21(DE3)pLysE
Product Size: 20 x 50 µL
Reduces Recombination: No
Cloning Methylated DNA: No
Improves Plasmid Quality: No
Propagating ccdB Vectors: Not for ccdB vector propagation
Transformation Efficiency: > 1x10^7
F' Episome (to make ssDNA): Lacks F' Episome
T1 Phage - Resistant (tonA): No
High Throughput Compatibility: Not High Throughput-Compatible (Manual)


Manuals & protocols

Recommended products