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应用（Application）
The Streptavidin Protein Europium chelate is a universal tool for TR-FRET assays that can bind biotinylated molecules. This product uses high-purity streptavidin (SA) covalently conjugated with Eu³⁺ chelate, and it can be used in combination with other Acceptors directly or indirectly labeled with fluorescent dyes. When the Donor and Acceptor come into close proximity (within a distance of less than 10 nm), a FRET reaction occurs: the 620 nm signal emitted by the Donor upon excitation by a specific light source is received by the Acceptor, which then emits a 665 nm signal.产品参数（Product Specifications）
SourceThis Streptavidin Protein is expressed from E. coli cells. It contains AA Ala 37 - Ser 163 (Accession # P22629-1).FormulationLyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.Physical AppearancePowderStorage (unopened)-20°C to -70°CStorage (opened)-70°CUnit Size5000 tests & 20000 testsTechnologyTR-FRETIntended UseFor binding the biotinylated molecules as donor in TR-FRET Assay重构方法（Reconstitution）
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
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数据展示
活性（Bioactivity）-TR-FRET
Please refer to DS document for the assay protocol.
In the TR-FRET assay, Streptavidin Protein Europium chelate (Cat. No. FRT-TD09) is used as the Donor and Monoclonal Anti-Human IgG Antibody FA-Labeled (Cat. No. FRT-TA02) is used as the Acceptor. Biotinylated Human PD-1 Protein, Avitag,His Tag (Cat. No. PD1-H82E4), at 1 ng/well, can bind to the Monoclonal Anti-Human PD-1 Antibody, Human IgG4 with a linear detection range of 5-0.005 μg/mL (QC tested).
In the TR-FRET assay, Streptavidin Protein Europium chelate (Cat. No. FRT-TD09) is used as the Donor and Monoclonal Anti-His Tag Antibody, Human IgG1 FA-Labeled (Cat. No. FRT-TA04) is used as the Acceptor. An inhibition Assay was performed to evaluate the interaction between Biotinylated Human PD-1, Fc,Avitag (Cat. No. PD1-H82F1) and Human PD-L1, His Tag (Cat. No. PD1-H5229) using Monoclonal Anti-Human PD-1 Antibody, Human IgG4 resulting in a typical IC50 of 2.285 μg/mL.
In the TR-FRET assay, Streptavidin Protein Europium chelate (Cat. No. FRT-TD09) is used as the Donor and Monoclonal Anti-His Tag Antibody, Mouse IgG1 FA-Labeled (Cat. No. FRT-TA05) is used as the Acceptor. An inhibition Assay was performed to evaluate the interaction between Biotinylated Human PD-1, Fc,Avitag (Cat. No. PD1-H82F1) and Human PD-L1, His Tag (Cat. No. PD1-H5229) using Monoclonal Anti-Human PD-1 Antibody, Human IgG4 resulting in a typical IC50 of 1.578 μg/mL.
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