Assay Method Information

Assay Name:  Binding Assay
Description:  For total binding, a total volume of 50 ul of appropriately diluted membranes (diluted in assay buffer containing 50 mM Tris HCl (pH 7.4), 10 mM MgCl2, and 1 mM EDTA; 5-50 μg protein) is added to 96-well polyproylene microtiter plates followed by addition of 100 μl of assay buffer and 50 μl of Radiolabelled 5-HT2A Ligand. For nonspecific binding, 50 μl of assay buffer is added instead of 100 μl and an additional 50 μl of 10 μM cold 5-HT2A is added before 50 μl of Radiolabelled 5-HT2A Ligand is added. Plates are then incubated at room temperature for 60-120 minutes. The binding reaction is terminated by filtering assay plates through a Microplate Devices GF/C Unifilter filtration plate with a Brandell 96-well plate harvester followed by washing with cold 50 mM Tris HCl, pH 7.4 containing 0.9% NaCl. Then, the bottom of the filtration plate are sealed, 50 μl of Optiphase Supermix is added to each well, the top of the plates are sealed, and plates are counted in a Trilux MicroBeta scintillation counter. For compound competition studies, instead of adding 100 μl of assay buffer, 100 μl of appropriately diluted test compound is added to appropriate wells followed by addition of 50 μl of Radiolabelled 5-HT2A Ligand.
Affinity data for this assay
 

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