| Assay Method Information | |
| | Surface Plasmon Resonance (SPR) Assay |
| Description: | Recombinant full-length hnRNPA1 (aa 1-320) and truncated versions of hnRNPA1, including the N-terminal RNA binding domain (aa 1-196), the middle region (aa 182-268), and the C-terminal region (aa 268-320), were individually covalently coupled to a dextran matrix (CM5 chip) using a Biacore T200 system (GE Healthcare), following the manufacturer's protocols. Immobilized proteins were activated with N-hydroxysuccinimide and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide to form a carbodiamide linkage between carboxyl moieties on the dextran and primary amide groups on the protein. hnRNPA1 variants were dissolved in 10 mM acetate buffer (full-length, pH 4; N-terminal RNA binding domain and the C-terminal region, pH 4.5; middle region, pH 5) to a concentration of 20 μg/ml and flowed over the activated surface for 5 min with PBS. Unreacted groups were blocked with ethanolamine. PBS containing 0.05% (v/v) P20 (surfactant) and 5% DMSO was used for priming and conditioning the surface of the chips. Quercetin was serially diluted (from 200 to 3 μM) in PBS buffer and maintained in DMSO (5% (v/v)) (final concentrations from 10 to 0.15 μM). The baseline response was determined for 120 s (30 μl/min) before perfusing the immobilized proteins with the compounds to allow association to occur. Dissociation was then monitored over a period of an additional 120 s. The immobilized proteins were regenerated with 50 mM NaOH. |
| Affinity data for this assay | |
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