ENTRY       EC 3.4.11.3
NAME        Cystinyl aminopeptidase
            Cystyl-aminopeptidase
            Oxytocinase
            Cystine aminopeptidase
CLASS       Hydrolases
            Acting on peptide bonds (peptidases)
            Aminopeptidases
REACTION    Release of an N-terminal amino acid, Cys+Xaa, in which the half-
            -cystine residue is involved in a disulfide loop, notably in
            oxytocin or vasopressin. Hydrolysis rates on a range of aminoacyl
            arylamides exceed that for the cystinyl derivative.
SUBSTRATE   Oxytocin
            Vasopressin
            H2O
PRODUCT     L-Cysteine
            Oligopeptide
COFACTOR    Zinc
COMMENT     A zinc-containing sialoglycoprotein.
DBLINKS     University of Geneva ENZYME DATA BANK: 3.4.11.3
            WIT (What Is There) Metabolic Reconstruction: 3.4.11.3
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