Title: Studies on the Proteolytic Enzymes in Plant
Abstract: By the viscosimetric determination it was found that the proteolytic activity of papain inhibited by heavy metal ions such as Hg++, Cu++ could be recovered by cation exchangeable base (C. E. B.), while C. E. B. alone has no effect on the activity of natural papain. This fact shows that the activation of natural papain by cysteine or HCN is not due to the removal of heavy metal ions from the enzyme molecule.