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Determination of Intracellular Prolyl/Glycyl Proteases in Intact Living Human Cells and Protoporphyrin IX Production as a Reporter System

Berger, Yann ; Chapuis Bernasconi, Catherine ; Schmitt, Frédéric ; Neier, Reinhard ; Juillerat-Jeanneret, Lucienne

In: Chemistry & Biology, 2005, vol. 12, no. 8, p. 867-872

The determination of enzyme activity or inhibition in intact living cells is a problem in the development of inhibitors for intracellular proteases. The production of fluorescent protoporphyrin IX (PpIX) from the nonfluorescent (N)-Gly/Pro-5-aminolevulinic acid (ALA) substrates was used to evaluate the prolyl/glycyl-specific dipeptidylpeptidase IV (DPPIV)-like and prolyloligopeptidase (POP)-like...