| Assay Method Information | |
| | Acid Ceramidase Activity Assay |
| Description: | A hAC protein preparation (10 μg) was preincubated with inhibitors (final DMSO concentration 1%) in assay buffer (100 mM sodium phosphate, 0.1% Nonidet P-40, 150 mM NaCl, 3 mM DTT, 100 mM sodium citrate, pH 4.5) for 30 min at 37° C. Reactions were started by the addition of 50 μM N-lauroyl ceramide (Nu-Chek Prep, Elysian, Minn.) and carried on for 30 min at 37° C. Reactions were stopped by addition of a mixture of chloroform/methanol (2:1, vol/vol) containing 1 nmol 11-lauroleic acid (NuChek Prep). The organic phases were collected, dried under nitrogen and analyzed by UPLC/MS (Acquity, Waters) in the negative-ion mode monitoring the reaction product (lauric acid, m/z=199) using 11-lauroleic acid as internal standard.Lipids were eluted on an Acquity UPLC BEH C18 column (50 mm length, 2.1 mm i.d., 1.7 μm pore size, Waters) column at 0.5 mL-min−1 for 1.5 min with a gradient of acetonitrile (CH3CN) and water, both containing 0.25% acetic acid and 5 mM ammonium acetat |
| Affinity data for this assay | |
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