Isolation of full-length IgG antibodies from combinatorial libraries expressed in the cytoplasm of Escherichia coli

Michael-Paul Robinson, Emily C. Cox, Mingji Li, Thapakorn Jaroentomeechai, Xiaolu Zheng, Matthew Chang, Mehmet Berkmen, Matthew P. DeLisa

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Received Date: 9th May 20

We describe a facile and robust genetic selection for isolating full-length IgG antibodies from combinatorial libraries expressed in the cytoplasm of the genetically engineered Escherichia coli strain, SHuffle. The method is based on the transport of a bifunctional substrate comprised of an antigen fused to chloramphenicolacetyltransferase, which allows positive selection of bacterial cells co-expressing cytoplasmic IgGs called ‘cyclonals’ that specifically capture the chimeric antigen and sequester the antibiotic resistance marker in the cytoplasm. The selective power of this approach was demonstrated by facile isolation of novel complementarity-determining regions for a cyclonal that specifically recognized the basic-region leucine zipper domain of the yeast transcriptional activator protein Gcn4.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

Nature Communications

Nature Research, Springer Nature