Patent ID: 8283321

Claim:
A pharmaceutical composition comprising a kallikrein inhibiting protein and a pharmaceutically acceptable carrier, wherein the kallikrein inhibiting protein comprises a non-naturally occurring Kunitz domain, said Kunitz domain having disulfide bonds at Cys5-Cys55, Cys14-Cys38, and Cys30-Cys51 and further having: amino acid number 13 selected from the group consisting of His and Pro; amino acid number 14 as Cys; amino acid number 16 selected from the group consisting of Ala and Gly; amino acid number 17 selected from the group consisting of Ala, Asn, and Ser; amino acid number 18 selected from the group consisting of His and Leu; amino acid number 19 selected from the group consisting of Gln, Leu, and Pro; amino acid number 31 as Glu; amino acid number 32 selected from the group consisting of Glu and Gln; amino acid number 34 selected from the group consisting of Ser, Thr, and Ile; and amino acid number 39 selected from the group consisting of Gly, Glu, and Ala, wherein the above amino acids are numbered to correspond to the numbering of amino acid residues of bovine pancreatic trypsin inhibitor (BPTI) (SEQ ID NO:1), and wherein the kallikrein inhibiting protein binds plasma kallikrein with a Ki less than 500 pM.