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Assay Method Information

Assay Name:  Enzyme Activity Assay
Description:  Cells were washed two times with 200 μL dPBS followed by the addition of 70 μL of substrate (2.11 mM 3 mM 4-MU-α-D-glu) in citrate-phosphate buffer (30 mM sodium citrate, 40 mM sodium phosphate dibasic, pH 4.0), and 2.5% DMSO to rows 1-12. Following incubation at 37 C. with 5% CO2 for about 3 h, 70 μL of stop buffer (0.4 M glycine pH 10.8) was added to rows 1-12. The plate was read in a Victor2 multilabel counter-Wallac fluorescent plate reader and the fluorescence at F460 nm was determined b at an excitation of 355 nm and emission of 460 nm using 1 second read time per well. Enzyme activity per μg of protein in the supernatant was calculated from the amount of fluorescence emitted, which is directly proportional to the amount of substrate hydrolyzed, and hence, the amount of Gaa activity in the lysate.
Affinity data for this assay
 

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Last update November 1, 2007
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