Abstract
A cDNA clone for human secretory leukocyte inhibitor (SLPI) was used to construct fusions to the secretion signal sequences of two secreted yeast proteins: invertase and α-factor. The invertase system produced both active SLPI, cleaved at the predicted signal-peptidase processing site, and an inactive form of SLPI that retains the invertase signal peptide. Both forms remained cell-associated, but it is possible to extract selectively the processed, active form of the protein without mechanical disruption of the cells. The α-factor system resulted in secretion, of several forms of active and inactive SLPI that result from the mis- or incomplete processing of the fusion polypeptide. We also report the expression and secretion of a truncated form of SLPI, using α-factor secretory signals, that contains the proposed elastase inhibitory site. This 60-amino-acid variant is a correctly processed, fully active inhibitor of leukocyte elastase but lacks the trypsin inhibitory activity of the full-length molecule.
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Stetler, G., Forsyth, C., Gleason, T. et al. Secretion of Active, Full– and Half–Length Human Secretory Leukocyte Protease Inhibitor by Sacchammyces Cerevisiae. Nat Biotechnol 7, 55–60 (1989). https://doi.org/10.1038/nbt0189-55
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DOI: https://doi.org/10.1038/nbt0189-55