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  • Title: Secretion of a heterologous protein from Bacillus subtilis with the aid of protease signal sequences.
    Author: Vasantha N, Thompson LD.
    Journal: J Bacteriol; 1986 Mar; 165(3):837-42. PubMed ID: 3081490.
    Abstract:
    Secretion vectors based on the genes from Bacillus amyloliquefaciens P for alkaline protease (aprBamP) and neutral protease (nprBamP) were constructed. With both aprBamP and nprBamP, a unique restriction site was introduced 3' of the predicted signal coding region by using the technique of oligonucleotide-directed mutagenesis. The new sites enabled us to fuse a heterologous gene to the expression and secretion elements. We used the protein A gene (spa) from Staphylococcus aureus as a heterologous gene. Bacillus subtilis cells carrying the resulting apr-spa or npr-spa gene fusions synthesized the fusion protein. B. subtilis cells were also capable of removing the signal peptide from the fusion protein, as indicated by the appearance of processed protein A into the growth medium. In addition, these gene fusions allowed us to identify the signal processing site of both the APR-SPA and NPR-SPA proteins.
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