ID 3.4.14.6 DE dipeptidyl-dipeptidase. AN dipeptidyl ligase. AN dipeptidyl tetrapeptide hydrolase. AN tetrapeptide dipeptidase. CA Preferential release of dipeptides from a tetrapeptide, e.g. Ala- CA Gly-|-Ala-Gly. Acts more slowly on Ala-Ala-|-Ala-Ala and Gly-Gly-|-Gly- CA Gly. CC -!- Tetrapeptides are formed from Ala-Ala, Gly-Gly, Ala-Gly and Gly-Ala CC without prior activation of the carboxy group. CC -!- Activated by thiols. CC -!- From cabbage (Brassica oleracea). //