Enhanced heterologous production of eicosapentaenoic acid in Escherichia coli cells that coexpress eicosapentaenoic acid biosy
نویسندگان
چکیده
Cellular eicosapentaenoic acid (EPA) makes up approximately 3% of total fatty acids in Escherichia coli DH5α, a strain that carries EPA biosynthesis genes (pEPAΔ1). EPA was increased to 12% of total fatty acids when the host cell coexpressed the vector pGBM3::sa1(vktA), which carried the high-performance catalase gene, vktA. Where this vector was coexpressed, the transformant accumulated a large amount of VktA protein. However, the EPA production of cells carrying the vector that included the insert lacking almost the entire vktA gene was approximately 6%. This suggests that the retention of a large DNA insert in the vector and the accumulation of the resulting protein, but not the catalytic activity of VktA catalase, would potentially be able to increase the content of EPA.
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