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Assay Method Information |
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| | Inhibition Assay |
| Description: | β-secretase (BACE-1, Sigma-Aldrich) inhibition studies were performed by employing a peptide mimicking APP sequence as substrate (Methoxycoumarin-Ser-Glu-Val-Asn-Leu-Asp-Ala-Glu-Phe-Lys-dinitrophenyl, M-2420, Bachem, Germany). The following procedure was employed: 5 μL of test compounds (or DMSO, if preparing a control well) were pre-incubated with 175 μL of enzyme (in 20 mM sodium acetate containing 3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS) 0.1% w/v) for 1 hour at rt. The substrate (3 μM, final concentration) was then added and left to react for 15 minutes at 37° C. The fluorescence signal was read at λem=405 nm (λexc=320 nm) using a Fluoroskan Ascent. The DMSO concentration in the final mixture maintained below 5% (v/v) guaranteed no significant loss of enzyme activity. The fluorescence intensities with and without inhibitor were compared and the percent inhibition due to the presence of test compounds was calculated. The background signal was measured in control wells containing all the reagents, except BACE-1 and subtracted. The % inhibition due to the presence of increasing test compound concentration was calculated by the following expression: 100−(IFi/IFo×100) where IFi and IFo are the fluorescence intensities obtained for BACE-1 in the presence and in the absence of inhibitor, respectively. Inhibition curves were obtained by plotting the % inhibition versus the logarithm of inhibitor concentration in the assay sample, when possible. The linear regression parameters were determined and the IC50 extrapolated (GraphPad Prism 4.0, GraphPad Software Inc.). |
| Affinity data for this assay | |
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