obsolete wide-spectrum protease inhibitor activity true GO:0017114 wide-spectrum proteinase inhibitor This term was made obsolete because it represents a regulator of non-existent molecular function. molecular_function wide-spectrum protease inhibitor activity OBSOLETE. Stops, prevents or reduces the activity of a protease by a wide-spectrum protease inhibitor. A wide-spectrum protease inhibitor is a protein having a peptide stretch which contains specific cleavage sites for different proteinases enabling inhibition of all four classes of proteinases by formation of a covalent bond between the inhibitor and the protease. peptidase inhibitor activity