Transformation efficiency: 0.6-1 x 109 cfu/μg pUC19 DNA
Enhanced BL21 derivative ideal for Plac, Ptac, Ptrc expression vectors
Deficient in proteases Lon and OmpT
Resistant to phage T1 (fhuA2)
Does not restrict methylated DNA (McrA-, McrBC-, EcoBr-m-, Mrr-)
Free of animal products
Versatile non-T7 expression strain
fhuA2 [lon] ompT gal sulA11 R(mcr-73::miniTn10--TetS)2 [dcm] R(zgb-210::Tn10--TetS) endA1 Δ(mcrC-mrr)114::IS10
The following reagents are supplied with this product:
Store at (°C)
pUC19 Transformation Control Plasmid
SOC Outgrowth Medium
Advantages and Features
Chemically competent E. coli cells suitable for high efficiency transformation and protein expression. Recommended host strain for pMAL Protein Fusion and Purification System.
Properties and Usage
Antibiotics for Plasmid Selection
Ships on dry ice
Quality Control Assays
The following Quality Control Tests are performed on each new lot and meet the specifications designated for the product. Individual lot data can be found on the Product Summary Sheet/Datacard or Manual which can be found in the Supporting Documents section of this page.
Transformation Efficiency: The competent cells are tested for transformation efficiency and pass minimum release criteria. Transformation efficiency is defined as the number of colony forming units (cfu) which would be produced by transforming 1 μg of plasmid into a given volume of competent cells.
Material Safety Datasheets
The following is a list of Material Safety Data Sheets (MSDS) that apply to this product to help you use it safely. The following file naming structure is used to name these document files: [Product Name] MSDS. For international versions please contact us at firstname.lastname@example.org.
The Product Summary Sheet, or Data Card, includes details for how to use the product, as well as details of its formulation and quality controls. The following file naming structure is used to name the majority of these document files: [Catalog Number]Datasheet-Lot[Lot Number]. For those product lots not listed below, please contact NEB at email@example.com or fill out the Technical Support Form for appropriate document.
CAUTION: This product contains DMSO, a hazardous material. Review the MSDS before handling.
STORAGE AND HANDLING: Competent cells should be stored at -80°C. Storage at -20°C will result in a significant decrease in transformation efficiency. Cells lose efficiency whenever they are warmed above -80°C, even if they do not thaw.