Dipeptidyl peptidase IV. Purification for use in peptide sequencing

Isolation and purification of dipeptidyl peptidase IV from pig kidney are described. The specific activity of the enzyme is 24.9 U/mg protein. Chromatography on Gly-Pro-AH-Sepharose is the most important procedure for the separation from other enzyme activities. The enzyme preparation is free of aminopeptidase, dipeptidase and prolyl endopeptidase activity; it can be used for peptide-sequence analysis.