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  • Title: Acid-sensitive latent inhibitors for proteolytic enzymes: synthesis and characterization.
    Author: Silver MS, Haskell JH.
    Journal: J Med Chem; 1989 Jun; 32(6):1253-9. PubMed ID: 2724298.
    Abstract:
    The reaction between peptide aldehydes and acylhydrazones affords derivatives that represent potential prodrugs for selective inhibition of lysosomal enzymes. BzPheal = Ala, obtained from the reaction between N-benzoyl-L-phenylalaninal and N-acetyl-L-alanine hydrazide, has been most carefully studied. When BzPheal = Ala is introduced into ongoing reactions catalyzed by alpha-chymotrypsin or papain, the rate of these reactions diminishes more rapidly with time than do those of controls lacking BzPheal = Ala. Furthermore, the disparity between run and control is much greater at pH 5 than at pH 7. The extent of inhibition (defined as explained in the text) at pH 5 can exceed that at pH 7 by 25-40-fold. The data are quantitatively explained by a reaction scheme that recognizes three important properties of BzPheal = Ala: (1) It undergoes hydrolysis at pH 5-7 to regenerate N-benzoyl-L-phenylalaninal; (2) the aldehyde thus liberated is a far more potent inhibitor for serine or cysteine proteases than is BzPheal = Ala; and (3) the rate constant for hydrolysis of BzPheal = Ala at pH 5 greatly exceeds that at pH 7.
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