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Engineered sigma factors increase full-length antibody expression in Escherichia coli.
Metabolic Engineering 2019 January 3
Escherichia coli (E. coli) is a promising platform for expression of full-length antibodies owing to its several advantages as a production host (fast growth, well characterized genetics, low manufacturing cost), however, low titers from shake flask (typically <5mg/L) has limited its use for production of research-grade material in antibody discovery programs. In this work, we used global transcriptional machinery engineering (gTME) with high throughput screening to increase the expression of full-length antibodies in E. coli. A library of E. coli mutants carrying mutations in the global sigma factor RpoD were generated and screened using the Bacterial Antibody Display (BAD) method for enhanced expression. RpoD mutants were isolated that resulted in full-length antibody titers of up to 130.7±6.6mg/L of shake flask culture with chaperone co-expression. These results could be useful for production of several antibodies quickly in shake flasks for characterization (e.g. antigen binding, biological function) during the early discovery phase.
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