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Assay Method Information |
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| | Enzyme Activity Assay |
| Description: | Activity of GBA was measured at 37° C. with 4-methylumbelliferyl β-D-glucopyranoside as substrate as reported previously. To determine the IC50 value, the inhibitors were preincubated for 30 min with the enzyme before addition of the substrate mixture. The incubation mixture contained 3 mM fluorogenic substrate, 0.2% (w/v) sodium taurocholate and 0.1% (v/v) Triton X-100 in 150 mM McIlvaine buffer, pH 5.2. After stopping the incubation with excess NaOH-glycine (pH 10.3), we measured fluorescence with a fluorimeter LS 30 (Perkin Elmer) using λex 366 nm and λem 445 nm. Activity of lactase was quantified by measuring liberated glucose from lactase38. In vivo activity of GBA in cells was measured using FDG as substrate and FACS32. |
| Affinity data for this assay | |
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