Engineering an efficient secretion of leech carboxypeptidase inhibitor in <it>Escherichia coli</it>

<p>Abstract</p> <p>Background</p> <p>Despite advances in expression technologies, the efficient production of heterologous secreted proteins in <it>Escherichia coli </it>remains a challenge. One frequent limitation relies on their inability to be exported to the <it>E. coli </it>periplasm. However, recent studies have suggested that translational kinetics and signal sequences act in concert to modulate the export process.</p> <p>Results</p> <p>In order to produce leech carboxypeptidase inhibitor (LCI) in the bacterial periplasm, we compared expression of the natural and optimized gene sequences, and evaluated export efficiency of LCI fused to different signal sequences. The best combination of these factors acting on translation and export was obtained when the signal sequence of DsbA was fused to an <it>E. coli </it>codon-optimized mature LCI sequence. When tested in high cell density cultures, the protein was primarily found in the growth medium. Under these conditions, the engineered expression system yields over 470 mg.l^-1of purified active LCI.</p> <p>Conclusion</p> <p>These results support the hypothesis that heterologous secreted proteins require proper coupling between translation and translocation for optimal high-level production in <it>E. coli</it>.</p>

Abstract licence: CC BY-NC-ND

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