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Assay Method Information

Assay Name:  Trans-Phosphorylation Assay
Description:  The inhibitory activity of putative kinase inhibitors and the potency of selected compounds were determined using a trans-phosphorylation assay.Specific peptide or protein substrates were trans-phosphorylated by their specific ser-thr or tyr kinase in the presence of ATP traced with 33P-gamma-ATP, and in the presence of their own optimal buffer and cofactors. At the end of the phosphorylation reaction, more than 98% unlabeled ATP and radioactive ATP were captured by an excess of the ion exchange dowex resin; the resin then settled down to the bottom of the reaction plate by gravity. Supernatant was subsequently withdrawn and transferred into a counting plate, then evaluated by beta-counting. Kinase Buffer (KB):The buffer for PIM2 assay was composed of HEPES 50 mM, at pH 7.5, with 1 mM MgCl2, 1 mM DTT, 3 uM Na3VO4, and 0.2 mg/mL BSA. Full-length human PIM2 was expressed and purified as described in Fedorov O, et al., PNAS 2007 104, 51, 20523-28.
Affinity data for this assay
 

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Last update November 1, 2007
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