| Assay Method Information | |
| | Biochemical Assay |
| Description: | Compounds were solubilized in DMSO and serially diluted, using 3-fold dilutions, into 100% DMSO at a concentration 50-fold greater than the desired assay concentration. Following dilution, 1 ul was added to an empty 96-well microtiter plate. PRMT5/MEP50 protein complex was combined with H4(1-21) peptide (SGRGKGGKGLGKGGAKRHRKV) in PRMT5 assay buffer (50 mM Tris pH 8.5, 50 mM NaCl, 5 mM MgCl2, 1 mM EDTA, 1 mM TCEP) and 44 ul was added to the microtiter plate containing compound. S-Adenosyl-L-methionine (SAM) was prepared by combining 3H labelled SAM with unlabelled SAM in PRMT5 assay buffer such that the final SAM concentration was 10 uM and the specific activity was 0.2 uCi/ul. The reaction was initiated by adding 5 ul of SAM stock to the microtiter plate. The final reaction conditions were 10 nM PRMT5/MEP50 complex, 200 nM peptide and 1 uM SAM. Following a 25 minute incubation at room temperature, the reaction was stopped with the addition of 100 uL of 20% TCA. The 3H-peptide product was captured using a 96-well filter plate (MSIPN4B, Millipore) and washed 5 times with PBS buffer. Scintillation fluid (100 ul) was added to the dried filter plate and counted in a liquid scintillation counter. IC50 values were determined by fitting the data to the standard 4-parameter dose response equation using Pfizer proprietary software. |
| Affinity data for this assay | |
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