MilliporeSigma
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CMC0017

Sigma-Aldrich

OverExpress™ C41(DE3) Chemically Competent Cells

for the highest protein expression

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NACRES:
NA.85

grade

for molecular biology

cell transformation

competent cell type: chemically competent
transformation efficiency: ≥1 x 106 cfu/μg

shipped in

dry ice

storage temp.

−70°C

General description

OverExpress™ Electrocompetent and Chemically Competent Cells are E. coli strains that are effective in expressing toxic proteins from all classes of organisms, including eubacteria, yeasts, plants, viruses, and mammals. The effectiveness of these new strains in expressing toxic proteins has been validated in more than 350 publications. The OverExpress™ strains contain genetic mutations phenotypically selected for conferring tolerance to toxic proteins. The strain C41(DE3) was derived from BL21(DE3). This strain has at least one mutation, which prevents cell death associated with expression of many recombinant toxic proteins. The strain C43(DE3) was derived from C41(DE3) by selecting for resistance to a different toxic protein and can express a different set of toxic proteins to C41(DE3). OverExpress C41(DE3)pLysS and C43(DE3)pLysS also carry a chloramphenicol-resistant plasmid that encodes T7 lysozyme, which is a natural inhibitor of T7 RNA polymerase. Cells containing pLysS produce a small amount of T7 lysozyme. These strains are used to suppress basal expression of T7 RNA polymerase prior to induction, thus stabilizing recombinants encoding particularly toxic proteins.

Genotype

F – ompT hsdSB (rB- mB-) gal dcm (DE3)

Application

OverExpress™ C41 (DE3) chemically competent cells have been used for expression screening.

Features and Benefits

  • Express genes cloned into any T7 vector with these BL21(DE3) derivatives
  • Effective in expressing toxic & membrane proteins
  • Cited in over 350 research articles

Components

  • OverExpress C41(DE3) chemically competent cells
  • pUC 19 transformation control DNA
  • recovery medium for expression


Legal Information

OverExpress is a trademark of Imaxio, S.A.

Storage Class Code

10 - Combustible liquids

WGK

WGK 3

Certificate of Analysis

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Certificate of Origin

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Articles

Bacterial Transformation

Bacterial transformation is a process of horizontal gene transfer by which some bacteria take up foreign genetic material (naked DNA) from the environment. Bacteria that can take up free, extracellular genetic material are known as competent cells.

Protocols

OverExpress™ Chemically Competent Cells

Protocol for OverExpress™ Chemically Competent Cells. Product Numbers: CMC0017, CMC0018, CMC0019, CMC0020, CMC0023, CMC0024

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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