Searching for bioactive peptides, we analyzed acidic extracts of Phyllomedusa sauvagii skin and found two new proteins, PSKP-1 and PSKP-2, of 6.7 and 6.6 kDa, respectively, which, by sequence homology, belong to the Kazal family of serine protease inhibitors. PSKP-1 and PSKP-2 exhibit the unprecedented feature of having proline at P(1) and P(2) positions. A gene encoding PSKP-1 was synthesized and expressed in Escherichia coli. Recombinant PSKP-1 was purified from inclusion bodies, oxidatively refolded to the native state, and characterized by chemical, hydrodynamic and optical studies. PSKP-1 shows inhibitory activity against a serum prolyl endopeptidase, but is unable to inhibit trypsin, chymotrypsin, V8 protease, or proteinase K. In addition, PSKP-1 can be rendered active against trypsin by active-site site-specific mutagenesis, has bactericidal activity, and induces agglutination of red cells at micromolar concentrations. PSKP-1 might protect P. sauvagii teguments from microbial invasion, by acting as an inhibitor of an as-yet unidentified prolyl endopeptidase or directly as a microbicidal compound.
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