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Secretion of Functional Antibody and Fab Fragment from Yeast Cells

Arnold H. Horwitz, C. Paul Chang, Marc Better, Karl Erik Hellstrom and Randy R. Robinson
Proceedings of the National Academy of Sciences of the United States of America
Vol. 85, No. 22 (Nov. 15, 1988), pp. 8678-8682
Stable URL: http://www.jstor.org/stable/32806
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Secretion of Functional Antibody and Fab Fragment from Yeast Cells
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Abstract

We have constructed yeast strains that secrete functional mouse--human chimeric antibody and its Fab fragment into the culture medium. For chimeric whole antibody, cDNA copies of the chimeric light-chain and heavy-chain genes of an anti-tumor antibody were inserted into vectors containing the yeast phosphoglycerate kinase promoter, invertase signal sequence, and phosphoglycerate kinase polyadenylylation signal. Simultaneous expression of these genes in yeast resulted in secretion of properly folded and assembled chimeric antibody that bound to target cancer cells. Yeast chimeric antibody exhibited antibody-dependent cellular cytotoxicity activity but not complement-dependent cytotoxicity activity. For production of Fab fragments, a truncated heavy-chain (Fd) gene was created by introducing a stop codon near the codon for the amino acid at which papain digestion occurs. Simultaneous expression of the resulting chimeric Fd and light-chain genes in yeast resulted in secretion of properly folded and assembled Fab fragment that bound to target cancer cells.

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