| Assay Method Information | |
| | LOX Enzyme Activity Assay |
| Description: | The following reagents were prepared:Reagents500 mM CHES, pH 9 (with NaOH), filtered (MW=207.29)20.7 g in 200 ml in dH2O10% Pluronic F-127 (store at 4° C.)1 g in 10 ml in dH2O10 % BSA (store at 4° C.)−2.5 g in 25 ml dH2O1 M MgCl2.6H2O (MW=203)5.1 g in 25 ml dH2O5 M Urea (MW=60.06)60 g in 200 ml dH2O5 M NaCl (MW=58.44)14.6 g in 50 ml dH2O8.5 M Cadaverine Dihydrochloride (MW=175.10): Sigma, Cat No: C85611.49 g in 1 ml dH2O10 mM Na3VO4, pH 10 (with HCl), boil to activate (MW=183.91): Sigma, Cat No: S65080.1839 g in 10 ml dH2O20 mM Amplex Red (MW=257.25): Invitrogen, Cat No: A12222.5 mg in 1 ml DMSO (aliquot into 40 μl and store at −20° C.)1000 U/ml HRP in dH2O (store at 4° C.): Sigma, Cat No: P2088H2O2 (store at 4° C.): Sigma, Cat No: H1009DMSOLOX Assay Buffer: Volume (μl) Reagent 1 × plate Final Concn 500 mM CHES, pH 9 5000 100 mM 10% Pluronic F-127 125 0.05% 10% BSA 1250 0.5% 1M MgCl2 25 1 mM 5M Urea 5000 1M 5M NaCl 500 100 mM dH2O 13100 — Total Volume 25 000 —Inhibitors (Test Compounds):10 mM stock diluted to 10, 3, 1, 0.3, 0.1, 0.03, 0.01, 0.003, 0.001, and 0.0003 mM in drug plate, resulting in a concentration of 100, 30, 10, 3, 1, 0.3, 0.1, 0.03, 0.01, and 0.003 uM in the assay.LOX enzyme:LOX enzyme was obtained from pig skin by the method of Shackleton et al 1990.Assay Plates:Black, flat bottom 96 well platesProcedure:1. Dilute LOX enzyme in Assay Buffer (˜4 ml for one plate, 8 ml for two plates) (dilution dependent on batch activity)2. Add 0.5 μl test compound serial dilutions, in duplicate3. Add 0.5 μl serial dilutions of positive control, BAPN, down column 11 (no duplication)4. Add following controls: 0.5 μl DMSO (100% activity control)5. Cover plate and incubate for 20 min at room temperature on a plate shaker6. Prepare Start Mix: Volume Reagent 1 × plate 2 × plate Final Concn Assay Buffer 2 ml 3 ml — 8.5M Cadaverine 23 μl 34.5 μl 97.8 mM 20 mM Amplex Red 10 μl 15 μl 100 μM 1000 U/ml HRP 10 μl 15 μl 5 U/ml7. Add 10 μl Start Mix to No HRP control wells8. Add HRP to the Start Mix. Add 10 ul to all wells EXCEPT No HRP control wells9. Incubate for 45 min at room temp on a plate shaker, protected from light10. Measure fluorescence using a plate reader: Excitation wavelength: 545 nm Emission wavelength: 585 nm HRP Counter Assay Protocol1. Dilute 5 μl H2O2 in 640 μl dH2O. Add 1 μl diluted H2O2 to 10 ml Assay Buffer. Vortex2. Add 40 μl H2O2+Assay Buffer into every well on the counter assay plate EXCEPT no H2O2 control wells (add 40 μl Assay Buffer only)3. Add 0.5 μl test compound serial dilutions, in duplicate4. Add 0.5 μl serial dilutions of positive control, Na3VO4, down column 11 (no duplication)5. Add following controls: 0.5 μl DMSO (100% activity control) 1 μl diluted H2O2 (blow out control)6. Incubate for 20 min at room temp on a plate shaker. |
| Affinity data for this assay | |
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