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OverExpress™ C41(DE3) and C43(DE3) Competent Cells

  • Express genes cloned into any T7 vector with these BL21(DE3) derivatives
  • Effective in expressing toxic & membrane proteins
  • Cited in over 350 research articles
Please note: commercial entities require a license from Brookhaven Science Associates to purchase this product.
  • Ordering

  • Specifications

  • Resources

Product Description Size Cat. No. Price Quantity BUY
OverExpress C41(DE3) Chemically Competent Cells  12 rxns (SOLOs) 60442-1 $219.00
   24 rxns (SOLOs) 60442-2 $389.00
OverExpress C41(DE3) pLysS Chemically Competent Cells  12 rxns (SOLOs) 60444-1 $219.00
   24 rxns (SOLOs) 60444-2 $389.00
OverExpress C43(DE3) Chemically Competent Cells  12 rxns (SOLOs) 60446-1 $219.00
   24 rxns (SOLOs) 60446-2 $389.00
OverExpress C43(DE3) pLysS Chemically Competent Cells  12 rxns (SOLOs) 60448-1 $219.00
   24 rxns (SOLOs) 60448-2 $389.00
OverExpress ChemComboPack
(3 rxns each of the above four strains)
  12 rxns (SOLOs) 60452-1 $219.00
OverExpress C41(DE3) Electrocompetent Cells  12 rxns (SOLOs) 60341-1 $264.00
   24 rxns (SOLOs) 60341-2 $465.00
OverExpress C43(DE3) Electrocompetent Cells  12 rxns (SOLOs) 60345-1 $264.00
   24 rxns (SOLOs) 60345-2 $465.00
Expression Recovery Medium (lactose minus)  8 × 12 ml 80030-1 $102.00
Each OverExpress kit contains Electrocompetent or Chemically Competent Cells in SOLO packaging (1 transformation per tube), Expression Recovery Medium (lactose minus), pUC19 Positive Control Plasmid, pAVD10 Verification Plasmid, and complete protocols. ComboPacks contain 3 reactions each of chemically competent C41(DE3), C43(DE3), C41(DE)pLysS, and C43(DE3)pLysS.

Important Product Use Information
OverExpress Cells are licensed exclusively to Lucigen Corporation by Imaxio S.A. under US Pat. 6,361,966 and others. Purchase of OverExpress Cells is accompanied by a non-exclusive, non-transferable license for research use only. Commercial use requires a separate license available from Imaxio S.A. OverExpress Cells are also sold under a license issued to Lucigen Corporation by Brookhaven Science Associates, LLC (BSA) for research use by noncommercial entities. Commercial entities require a license from BSA even for research use.

OverExpress Genotypes
OverExpress C41(DE3): F – ompT hsdSB (rB- mB-) gal dcm (DE3)
OverExpress C41(DE3)pLysS: F – ompT hsdSB (rB- mB-) gal dcm (DE3) pLysS (CmR)
OverExpress C43(DE3): F – ompT hsdSB (rB- mB-) gal dcm (DE3)
OverExpress C43(DE3)pLysS: F – ompT hsdSB (rB- mB-) gal dcm (DE3) pLysS (CmR)

Table 1. OverExpress Transformation Efficiencies

Electrocompetent Cells
cfu/µg DNA
> 1 × 1010
> 1 × 1010
Chemically Competent Cells
> 1 × 106
> 1 × 106
> 1 × 106
> 1 × 106
Document File Name Type
Manual MA031-OverExpress-Chemicallycompetent-Cells PDF
Manual MA032-OverExpress-Electrocompetent-Cells PDF
Product Flyer OverExpress-2014 PDF
eLucidations High-Efficiency-Expression PDF
eLucidations Expression-of-Aspergillius_v8 PDF

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"Your OverExpress C41(DE3) cells express at at least 2x the level of other engineered BL21s with my minimally toxic proteins, and many fold higher levels with my more toxic proteins."
- Kevin Glenn, M.D. Assistant Professor of Internal Medicine, University Iowa


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