Bioorganic Chemistry p. 178 - 191 (2004)
Update date:2022-08-02
Topics:
Nguyen, Kiet T.
Hu, Xubo
Pei, Dehua
A new spectrophotometric/fluorimetric assay for peptide deformylase (PDF) has been developed by coupling the PDF reaction with that of dipeptidyl peptidase I (DPPI) and using N-formyl-Met-Lys-AMC as substrate. Removal of the N-terminal formyl group by PDF renders the dipeptide an efficient substrate of DPPI, which subsequently removes the dipeptidyl units to release 7-amino-4-methylcoumarin as the chromophore/fluorophore. The PDF reaction is conveniently monitored on a UV-Vis spectrophotometer or a fluorimeter in a continuous fashion. The utility of the assay was demonstrated by determining the catalytic activity of PDF and the inhibition constants of PDF inhibitors. These studies revealed the slow-binding behavior of a previously reported macrocyclic PDF inhibitor. This method offers several advantages over the existing PDF assays and should be particularly useful for screening PDF inhibitors in the continuous fashion.
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