| Assay Method Information | |
| | The radiometric assay for PRMT5 |
| Description: | After dissolved in dimethyl sulfoxide respectively, the test compounds were added into an Echo Qualified 384-well plate and diluted to the desired concentrations. The diluted test compounds were transferred from the Echo Qualified 384-well plate to a 384-well reaction plate using an Echo 550 instrument, and dimethyl sulfoxide was transferred into both the control and blank wells. PRMT5 was added to 1×reaction buffer (including 10 mM Tris-HCl; pH 8.0; 0.01% Tween-20; 1 mM DTT) to form a 1.67× enzyme solution (at an enzyme concentration of 5 nM). A polypeptide substrate and [3H]-SAM were added to 1× reaction buffer to form a 2.5× substrate solution (the terminal concentrations of the substrates were 100 nM and 250 nM, respectively). At a volume of 15 μL/well, the 1.67× enzyme solution was added into wells of the 384-well reaction plate. In case of the blank wells, the enzyme solution was replaced with 15 L of the 1× reaction buffer. The reaction plate was centrifuged at 1000 rpm for 1 min, and incubated at room temperature for 15 min. To each well of the 384-well reaction plate, 10 L of the 2.5× substrate solution was added, centrifuged at 1000 rpm for 1 min, and reacted at 25° C. for 60 min. To each well of the 384-well reaction plate, 5 L of reaction stop solution (which was 125 μM cold SAM solution) was added to terminate the reaction. From each well of the test plate, 25 μL was measured and transferred to Flashplate and left at room temperature for 1 h. Thereafter, the Flashplate was washed with 0.1% Tween-20 solution three times. Readings were taken with MicroBeta 2. The data was converted into the inhibition rate data. |
| Affinity data for this assay | |
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