Simultaneous purification and properties of dehydropeptidase-I and aminopeptidase-M from rat kidney

Res Commun Chem Pathol Pharmacol. 1985 Sep;49(3):435-45.


Two peptidases, dehydropeptidase-I and aminopeptidase-M were solubilized from rat kidney microsomes by treatment with papain and separated by DE-52 ion exchange chromatography. Each enzyme was further purified by Sephacryl S-300 gel filtration and affinity chromatography on Con-A Sepharose. Purified dehydropeptidase-I and aminopeptidase-M were homogeneous by SDS-polyacrylamide gel electrophoresis, and their molecular weights were estimated by gel filtration to be 148,000 and 240,000, respectively; both being homodimer, with a 78,000 subunit for the former and a 120,000 subunit for the latter. Both dehydropeptidase-I and aminopeptidase-M were capable of hydrolyzing L-leucyl-L-leucine with a Km valve of 1.1 mM and 1.7 mM, respectively, although the hydrolyzing activity of aminopeptidase-M was much higher than that of dehydropeptidase-I. Aminopeptidase-M was inhibited by bestatin, and dehydropeptidase-I was significantly inhibited by cilastatin. Dehydropeptidase-I catalyzed the conversion of leukotriene D4 to E4 and the hydrolysis of L-cystinyl-bis-glycine, but aminopeptidase-M did not to any appreciable extent. The physiological significance of dehydropeptidase-I was pointed out and discussed.

MeSH terms

  • Aminopeptidases / antagonists & inhibitors
  • Aminopeptidases / isolation & purification*
  • Animals
  • CD13 Antigens
  • Dipeptidases / antagonists & inhibitors
  • Dipeptidases / isolation & purification*
  • Glutathione / metabolism
  • Kidney / enzymology*
  • Male
  • Rats
  • Rats, Inbred Strains
  • SRS-A / metabolism


  • SRS-A
  • Aminopeptidases
  • CD13 Antigens
  • Dipeptidases
  • dipeptidase
  • Glutathione