Protein crystals isolated from potato tubers were found to consist of a proteinase inhibitor active against the cysteine proteinases papain, chymopapain, and ficin. The molecular weight as determined by gel filtration at pH 4.3 or by gel electrophoresis in the presence of dodecylsulfate was 80
Three protein inhibitors of proteolytic enzymes with molecular weights 21, 22, and 23 kD were isolated from potato tubers (Solanum tuberosum L.) by ammonium sulfate precipitation followed by gel and ion-exchange chromatography. The 21- and 22-kD proteins were shown to be serine proteinase inhibitors
The papain inhibitor isolated from chicken egg white inhibits the enzymatic activity of cathepsin B1 and cathepsin C. The inhibitor bears two nonoverlapping reactive sites: one binds cathepsin B1, papain, ficin, and bromelain, the other one cathepsin C. The inhibitor decreases the degree of an
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