Abstract
HURAIN1, the active principle of the sap of jabillo trees (Hura crepitans) which is responsible for its proteolytic action, apparently represents a proteinase with special chemical properties differing from those so far known for this class of enzymes. During purification and assay of the enzyme, it was found that the enzymatic activity of hurain is greatly affected by metal ions.
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SHARON DE SEIDL, D., GAEDE, K. Activation of Hurain by Bivalent iron. Nature 190, 1112 (1961). https://doi.org/10.1038/1901112a0
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DOI: https://doi.org/10.1038/1901112a0


