Trypsin and tissue plasminogen activator inhibitor DE-3 from Erythrina caffra contains 172 amino acids, including 4 half-cystine residues, and resembles the Kunitz-type inhibitors. Limited hydrolysis of DE-3 with trypsin at pH 3.2 produced two fragments, F1 and F2, containing 63 and 109 amino acids,
1. Four proteinase inhibitors (DE-1 to DE-4) were purified from Erythrina caffra seed by gel filtration on Sephadex G-50 followed by ion-exchange chromatography involving DEAE-cellulose and DEAE-sepharose. 2. They comprise 164-166 amino acid residues (mol. wt 18,100) including 4 half-cystine
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