Abstract
We have engineered the filamentous fungus Trichoderma reesei to assemble and secrete immunologically authentic engineered Fab antibody fragments into the culture medium. A major improvement in yield was achieved by fusing the heavy Fd chain to the T. reesei cellulase, CBHI. The yields of secreted, immunologically active Fab and CBHI-Fab fusion were 1 mg/1 and 150 mg/1, respectively. The Fab fragment can be released from the fusion protein CBHI-Fab by an extracellular T. reesei protease. There was no detectable difference in affinity for the antigen between the engineered Fab and the idiotypic antibody.
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Nyyssönen, E., Penttilä, M., Harkki, A. et al. Efficient Production of Antibody Fragments by the Filamentous Fungus Trichoderma reesei. Nat Biotechnol 11, 591–595 (1993). https://doi.org/10.1038/nbt0593-591
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DOI: https://doi.org/10.1038/nbt0593-591
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