Dipeptidyl-aminopeptidase III of rat brain. Selective affinity for enkephalin and angiotensin

C. M. Lee, S. H. Snyder

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The cytosolic dipeptidyl-aminopeptidase III (EC from rat brain was partially purified using Arg-Arg-4-methoxy-β-naphthylamide as a substrate. It was completely separated from aminopeptidase B on DEAE-Sephacel ion exchange chromatography. Similar to bovine pituitary dipeptidyl-aminopeptidase III, it has a pH optimum of 9, prefers Arg-Arg-4-methoxy-β-naphthylamide as a substrate, and catalyzes the sequential release of dipeptides from the NH2 terminus of peptide substrates provided they are not smaller than a tetrapeptide. Among numerous biologically active peptides tested, angiotensins and enkephalins were the most preferred substrates with micromolar affinities, suggesting that dipeptidyl-aminopeptidase III may play a physiologic role in regulating enkephalin and/or angiotensin disposition.

Original languageEnglish (US)
Pages (from-to)12043-12050
Number of pages8
JournalJournal of Biological Chemistry
Issue number20
StatePublished - 1982

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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