Bauhinia bauhinioides Kallikrein Inhibitor Fragments with Bradykinin-Like Activities

摘要

Medicinal plants extracts contain many proteinase inhibitors that could be an interesting source of new drugs. Structural modifications in some of this kind of macromolecule could also lead to compounds with interesting biological properties [1]. In this work, we studied one peptide fragment (BbKIsi-62) of Bauhinia bauhinioides kallikrein inhibitor (BbKI) [2,3] and its analogue (P2) that was designed by the insertion of a proline residue in order to mimic the TV-terminal region of the bradykinin (BK) molecule. Both retro inverso counterparts Ri-BbKIsira and Ri-P? were also included. We evaluated the capability of the peptides to induce contraction on stomach fundus of mouse as well as their capability to induce calcium release from guinea pig ileum cell culture. Both biological effects induced by the fragments were compared with the ones caused by BK.