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Assay Method Information

Assay Name:  DNA-PK Assay (Biochemical)
Description:  The kinase assay was carried out in streptavidin-coated 348-well microtitre flashplates. To this end, 1.5 μg of DNA-PK/protein complex and 100 ng of biotinylated substrate, such as, for example, PESQEAFADLWKK-biotin-NH2 (biotin-DNA-PK peptide), were incubated for 90 min at room temperature in a total volume of 36.5 μl (34.25 mM HEPES/KOH; 7.85 mM Tris HCl; 68.5 mM KCl; 5 μM ATP; 6.85 mM MgCl2; 0.5 mM EDTA; 0.14 mM EGTA; 0.69 mM DTT; pH 7.4) with 500 ng of DNA from calf thymus, 0.1 μCi of 33P-ATP and 1.8% of DMSO per well with and without the test compound. The reaction was stopped using 50 μl/well of 200 mM EDTA. After incubation for a further 30 min at room temperature, the liquid was removed. Each well was washed three times with 100 μl of 0.9% saline solution. A nonspecific reaction (blank value) was determined using 10 μM of an innate kinase inhibitor. The radioactivity measurement was carried out using a TopCount. IC50 values were calculated in RS1.
Affinity data for this assay
 

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Last update November 1, 2007
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