BL21 (DE3) produced the highest amount of ADI protein, followed by Rosetta (DE3). The following activity assay showed that ADI from BL21 (DE3) and Rosetta (DE3) had the most activity. Rosetta : Novagen: Rosetta host strains are BL21 lacZY (Tuner™) derivatives designed to enhance the expression of eukaryotic proteins that contain codons rarely used in E. coli. These strains supply tRNAs for the codons AUA, AGG, AGA, CUA, CCC, GGA on a compatible chloramphenicol resistant plasmid. Here, we describe how the protein expression of human gene fragments in E. coli strains BL21(DE3) and Rosetta(DE3) was evaluated in two stages. Initially a test set of 68 recombinant proteins that previously had been expressed in BL21(DE3) was retransformed and expressed in Rosetta(DE3). BL21 (DE3) showed the highest level of expression in inclusion bodies followed by Rosetta-gami (DE3) and Shuffle T7. Changes of expression conditions were insufficient for soluble expression of reteplase in SHuffle T7 as a genetically engineered host for production of disulfide bonded proteins. What is the difference between BL21 (DE3) pLysS and BL21 (DE3) pLysE? There are two cell lines that contain the T7 lysozyme; these are called BL21 (DE3) pLysS and BL21 (DE3) pLysE. The following table summarizes some of the key features of the two cell lines. BL21(DE3) Competent E.coli: C2527: 6 x 0.2ml: Agilent SURE2 Competent Cells: Agilent : 200152: 10 x 0.10ml: NEB Stable Competent E. coli (High Efficiency) C3040: 20 x 0.05ml: XL1-Blue MRF' Supercompetent Cells: Agilent: 200230: 5 x 0.2 mL: NEB ® Stable Competent E. coli (High Efficiency) C3040: 6 x 0.2 mL: BL21(DE3)pLysS Competent Cells .

difference between rosetta and bl21