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Membrane preparations from striatum of pig brain contain endopeptidase activity towards iodoinsulin B-chain. Only 50% of the hydrolysis of insulin B-chain is inhibitable by phosphoramidon, and DEAE-cellulose chromatography can resolve the phosphoramidon-sensitive and -insensitive activities. The former activity (now designated 'endopeptidase-24.11') is responsible for hydrolysis of [D-Ala2,Leu5]enkephalin and is identical with an enzyme in brain that has previously been referred to as 'enkephalinase'. Pig striatal endopeptidase-24.11 has now been purified to homogeneity in a single step by immunoadsorbent chromatography using a monoclonal antibody. The overall purification was 23 000-fold, with a yield of 30%. The brain enzyme appears to be identical with kidney endopeptidase-24.11 in amino acid composition as well as by immunological and kinetic criteria. However, it differs slightly in apparent subunit size (Mr = 87 000), attributable to differences in glycosylation.

Purification of endopeptidase-24.11 (‘enkephalinase’) from pig brain by immunoadsorbent chromatography