Summary
The gene coding for the bacterial plasminogen activator staphylokinase was cloned from the Staphylococcus aureus phage 42D, a serogroup F phage used for lysotyping, onto the standard Escherichia coli plasmid vector pACYC184. The coding and flanking sequences of the sak42D gene were largely identical to those of a sak gene cloned from the serologically different S. aureus phage SøC (Sako and Tsuchida 1983). Subcloning of a 2.5 kb phage 42D DNA fragment onto plasmid pGB3631 allowed the sak42D gene to be introduced into the gram-positive hosts Bacillus subtilis and Streptococcus sanguis. The sak42D gene was expressed and secreted most efficiently by B. subtilis cells (25 μg/ml of culture supernatant) reduced in exoprotease production. In this host expression and secretion of Sak was initiated at the early growth phase and continued through the logarithmic phase. Formation of Sak was, however, also observed with the other cloning hosts. The Sak elaborated by the heterologous hosts was serologically identical with authentic Sak derived from S. aureus.
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Behnke, D., Gerlach, D. Cloning and expression in Escherichia coli, Bacillus subtilis, and Streptococcus sanguis of a gene for staphylokinase — a bacterial plasminogen activator. Mol Gen Genet 210, 528–534 (1987). https://doi.org/10.1007/BF00327208
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DOI: https://doi.org/10.1007/BF00327208