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T7 Express lysY/Iq Competent E. coli (High Efficiency)

Catalog # Concentration Size List Price Quantity Your Price
C3013I 6 x 0.2 ml $290.00
$261.00
Catalog # Size List Price Your Price
C3013I 6 x 0.2 ml $290.00
$261.00
Catalog #
Qty:
 
*On-line ordering is for Canadian customers only. Web pricing is applicable only to orders placed online at www.neb.ca

High efficiency chemically competent E. coli cells suitable for T7 expression with highest level of expression control.

  • T7 RNA Polymerase in the lac operon - no λ prophage
  • Tight control of expression by laclq allows potentially toxic genes to be cloned
  • Control of T7 RNA Polymerase by lysozyme allows potentially toxic genes to be expressed
  • Deficient in proteases Lon and OmpT
  • Resistant to phage T1 (fhuA2)
  • Free of animal products
  • No dry ice surcharge on competent cell shipments
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  • Monarch_MiniprepProtocol_VideoThumb
    Fast transformation plating with glass beads
Chemically competent E. coli cells suitable for high efficiency transformation and protein expression.
Highlights
  • Enhanced BL21 derivative for T7 expression
  • T7 RNA Polymerase in the lac operon - no λ prophage
  • Tight control of expression by laclq allows potentially toxic genes to be cloned
  • Control of T7 RNA Polymerase by lysozyme allows toxic genes to be expressed
  • Lys Y is a variant of T7 lysozyme lacking any amidase activity, thus cells are less susceptible to lysis during induction
  • Maintenance of lysozyme/lacIq plasmid does not require antibiotic selection
  • Deficient in proteases Lon and OmpT
  • Resistant to phage T1 (fhuA2)
  • Does not restrict methylated DNA (McrA-, McrBC-, EcoBr-m-, Mrr-)
  • B Strain
  • Free of animal products
Reagents Supplied

The following reagents are supplied with this product:

NEB # Component Name Component # Stored at (°C) Amount Concentration
  T7 Express lysY/Iq Competent E. coli (High Efficiency) C3013IVIAL -80 6 x 0.2 ml
Features
  • T7 expression
  • Protease deficient
  • Highest level of expression control
Application Features

Transformation of a toxic mammalian clone into E. coli hosts C3013_fig1
A T7 expression plasmid and the same plasmid containing a gene encoding a toxic mammalian protein were transformed into each host. Comparison of the relative transformation efficiencies demonstrates that the T7 Express hosts provide the levels of control necessary for transformation of potentially toxic clones. BL21(DE3) could not be transformed with the toxic clone.
T7-controlled expression of a non-toxic protein in E. coli hostsC3013b_v2_000012
 A T7 expression plasmid containing a gene encoding an E. coli protein was transformed into each host, grown to 0.6 OD and induced for 3 hours. Comparison of soluble extracts from uninduced (-) and induced (+) cells shows superior control of basal expression in the T7 Express hosts while maintaining high levels of induced expression.
Effect of heat shock time on T7 Express lysY/Iq competent E.coli transformation efficiencyC3013a
50 μl of competent cells were transformed with 100 pg of pUC19 control DNA following the provided High Efficiency Transformation Protocol except heat shock time varied from 0 to 80 seconds.
Effect of DNA incubation time on T7 Express lysY/Iq competent E.coli transformation efficiencyC3013b
 50 μl of competent cells were transformed with 100 pg of pUC19 control DNA following the provided High Efficiency Transformation Protocol except DNA incubation time varied from 0 to 40 minutes

Properties & Usage

Antibiotic for Plasmid Selection

Antibiotics for Plasmid Selection Working Concentration
Ampicillin 100 µg/ml
Carbenicillin 100 µg/ml
Kanamycin 30 µg/ml
Streptomycin 25 µg/ml
Tetracycline 15 µg/ml

Shipping Notes

  • Ships on dry ice

Antibiotic Resistance

  • nit
  • cam


Companion Products
Materials Sold Separately
Notes
  • 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.
  • Maintenance of the miniF plasmid does not require antibiotic selection. If chloramphenicol is added, use 10 µg/ml final concentration.
Quality Control Assay
Quality Control tests are performed on each new lot of NEB product to meet the specifications designated for it. Specifications and individual lot data from the tests that are performed for this particular product can be found and downloaded on the Product Specification Sheet, Certificate of Analysis, data card or product manual. Further information regarding NEB product quality can be found here.
Specifications
The Specification sheet is a document that includes the storage temperature, shelf life and the specifications designated for the product. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]
Certificate of Analysis
The Certificate of Analysis (COA) is a signed document that includes the storage temperature, expiration date and quality controls for an individual lot. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]_[Lot Number]
Safety Data Sheets
Legal And Disclaimer

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This product is intended for research purposes only. This product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.

New England Biolabs (NEB) is committed to practicing ethical science – we believe it is our job as researchers to ask the important questions that when answered will help preserve our quality of life and the world that we live in. However, this research should always be done in safe and ethical manner. Learn more.

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