Four different archaeal genes expressed in (1) BL21-Gold (DE3) or (2) BL21-CodonPlus (DE3)-RIL Cells
To clone or not to clone is seldom the question in today's fast-paced genetics research laboratory--cloning inevitably wins out. Past obstacles faced by the early recombinant DNA research community, such as finding acceptable hosts and vectors and isolating the desired genetic material, have since been worked out and replaced with the struggle to get optimal expression of those clones.

Escherichia coli have long been a favorite host for their simple, rapid, and economical propagation. But heterologous protein expression in prokaryotic cells can have certain drawbacks, including toxicity of the foreign protein and low yields. Codon bias problems can occur when codons that are seldom used in endogenous E. coli genes are found frequently in the foreign gene. This situation is not uncommon when expressing human genes in bacterial hosts and can result in low recombinant protein...

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