Components

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

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

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.GenotypeF – ompT hsdSB (rB- mB-) gal dcm (DE3) pLysS (CmR)

Legal Information

OverExpress is a trademark of Imaxio, S.A.