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| | Fluorescence Assay for Recombinant Human (RH) DPP |
| Description: | The activity of DPP1 was determined by measuring the enzymatic release of aminomethyl coumarin (AMC) from the peptide substrate (H-Gly-Arg-AMC), which leads to an increase in fluorescence intensity at λex=350 nm and λem=450 nm. The assay was carried out in black 384 well plates in a final volume of 10 μl at rt. The assay conditions contained the following: 25 mM piperazine buffer pH 5.0; 50 mM NaCl, 5 mM DTT; 0.005 (v/v) Triton X-100; 50 μM H-Gly-Arg-AMC and 96.4 pM rhDPP1. Potential inhibitors were diluted in DMSO to generate 100× of the final assay concentration. The compounds were tested at 10 concentrations with half-log dilution steps (highest concentration typically 1 μM) and with a final DMSO concentration of 1% (v/v). Routinely, inhibitors were pre-incubated with rhDPP1 for 30 min prior to the addition of the peptide substrate to start the reaction for a further 30 min. After incubation the plates were read in a fluorescence plate reader using the above emission and excitation wavelengths. The pIC50were determined using a 4-parameter logistic equation in a non-linear curve fitting routine (Smartfit, Genedata Screener ). |
| Affinity data for this assay | |
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