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Preparative purification of dipeptidyl peptidase IV.

Dipeptidyl-Peptidase IV was purified from pig kidney by ammonium sulfate fractionation, gel filtration, QAE-cellulose chromatography and affinity columns with Gly-Pro- and Concanavalin A-Sepharose. The specific activity of the purified enzyme is 41.8 units/mg. Polyacrylamide gel electrophoresis and silver staining show a single band. The enzyme preparation is free of aminopeptidase and dipeptidase activity, proved fluorimetrically and by gas chromatography/ mass spectrometry. The most important procedure for removal of contaminating enzyme activities is a stepwise NaCl-gradient on a QAE-ZetaPrep ion exchange disk.[1]


  1. Preparative purification of dipeptidyl peptidase IV. Seidl, R., Schaefer, W. Prep. Biochem. (1991) [Pubmed]
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