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The aminopeptidase N (AP N, EC 3.4.11.2) is an ectoenzyme of the plasma membrane, playing presumably an important role in the regulation of immunological processes. The specific activities of Ala-pNA and Leu-pNA cleavage (per cell) are distributed in monocytes T- and non-T-lymphocytes in a proportion of 1:0.2:0.25 and 1:0.17:0.18, respectively. The capacities of Ala-pNA and Leu-pNA hydrolysis in the total fraction T- and non-T-cells are distributed as 1:0.8 and 1:0.7, respectively. The main part of Ala-pNA cleavage was shown to be caused by AP N on the basis of the KM-value (0.5 mmol/l), the activation by CO2+ ions and the pH optimum (7.0-7.5). The Leu-pNA cleavage is dependent on CO2+ and DTT and distinct from the classical cytosolic leucyl aminopeptidase.
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