| Assay Method Information | |
| | Biochemical Activities Determination for SIK3 Protein |
| Description: | Compounds were tested for inhibition of SIK3 kinase (aa59-365, Thermo Fisher) in assays based on the time-resolved fluorescence-resonance energy transfer (TR-FRET) methodology. The assays were carried out in 384-well low volume white plates in a reaction mixture containing SIK3 kinase, 125 uM ATP, 0.5 μM STK1 substrate and 0-10 μM compound in buffer containing 25 mM Tris, 0.01% Trition X-100, 0.5 mM EGTA, 5 mM MgCl2, 2.5 mM DTT, PH=7.5. The kinase was incubated with compound for 60 minutes at room temperature and the reaction was initiated by the addition of ATP and STK1 substrate. After reaction at room temperature for 180 minutes, an equal volume of stop/detection solution was added according to the manufacture's instruction (CisBio Bioassays). The stop/detection solution contained STK Antibody-Cryptate and XL665-conjugated streptavidin (Cat: 62ST1PEC, Cisbio) in Detection Buffer (Cat: 62SDBRDF, Cisbio). Plates were sealed and incubated at room temperature for overnight, and the TR-FRET signals (ratio of fluorescence emission at 665 nm over emission at 620 nm with excitation at 337 nm wavelength) were recorded on a PHERAstar FS plate reader (BMG Labtech). Phosphorylation of STK1 substrate led to the binding of STK Antibody-Cryptate to the biotinylated STK1 substrate, which places fluorescent donor (Eu3+ crypate) in close proximity to the accepter (Streptavidin-XL665), thus resulting in a high degree of fluorescence resonance energy transfer from the donor fluorophore (at 620 nm) to the acceptor fluorophore (at 665 nm). |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |