| Assay Method Information | |
| | Biochemical BTK Assay |
| Description: | Z′-LYTE biochemical assay employs a fluorescence resonance energy transfer (FRET)-based, coupled-enzyme format and is based on the differential sensitivity of phosphorylated and non-phosphorylated peptides to proteolytic cleavage. Both ends of the short peptide substrate are labeled with two fluorescent groups to form a FRET paired combination. In the primary reaction (the Kinase Reaction), the kinase transfers the γ-phosphate of ATP to a single serine or threonine residue on the short peptide substrate. In the secondary reaction (the development reaction), the non-phosphorylated short peptides were recognized and cleaved by a site-specific protease (the development reagent). Phosphorylated short peptides can resist such cleavage. Cleavage of short peptides can disrupt the donor (such as coumarin) and receptor fluorophores (fluorescein) on the short peptides, while the phosphorylated short peptides can maintain FRET. The calculation method of the ratio is as follows, and the ratio of the respective emission signals generated by the donor fluorophores emitted (after excitation at 400 nm) to the receptors is calculated. Emission signal ratio=emitted light by coumarin (445 nm)/emitted light by fluorescein (520 nm). If the FRET short peptide is phosphorylated (such as no kinase inhibitor), the emitted light ratio will remain in a lower level. If the FRET short peptide is non-phosphorylated (such as kinase inhibitor), the emitted light ratio will be in a higher level. In this way, the inhibitory effects of different compound inhibitors on BTK kinase activity would be distinguished. |
| Affinity data for this assay | |
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