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| | Trans-Phosphorylation Assay |
| Description: | Specific peptide or protein substrates are 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 is captured by an excess of the ion exchange dowex resin; the resin then settles down to the bottom of the reaction plate by gravity.Supernatant is subsequently withdrawn and transferred into a counting plate, then evaluated by beta -counting.Reagents/Assay ConditionsDowex Resin Preparation500 g of wet resin (SIGMA, custom prepared resin DOWEX 18 200-400 mesh, 2.5 Kg) are weighed out and diluted to 2 L in 150 mM sodium formate, pH 3.00.The resin is allowed to settle down (some hours) and then the supernatant is discarded.After three washes as above over a couple of days, the resin is allowed to settle and two volumes (wrt the resin volume) of 150 mM sodium formate buffer are added. |
| Affinity data for this assay | |
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