| Assay Method Information | |
| | Guanosine 5'-O-(3-[35S]thio)triphosphate [GTP gamma S] Binding Assay |
| Description: | A GTP gamma S binding assay can be used to investigate antagonist properties of compounds in CHO cells (Chinese Hamster Ovary) transfected with human Histamine H3 receptor (hH3R). Membranes from CHO cells expressing hH3R (10 ug/well) are diluted in GTP gamma S assay buffer (20 mM Hepes, 10 mM MgCl2, 100 mM NaCl, pH 7.4) and preincubated with saponine (3 ug/ml), GDP (10 uM) and PVT-WGA SPA beads (125 ug/well) (Amersham) for 30 minutes. To determine antagonist activity, (R)-methyl histamine (30 nM) is added in 96 well SPA plate with [35S]GTP gamma S (0.2 nM) and various concentration of H3R antagonists. The GTP gamma S binding assay is started with addition of the mixture membrane/saponine/GDP and incubated for 90 minutes at room temperature. The amount of bound [35S]GTP gamma S is determined by using the MicroBeta Trilux counter (PerkinElmer). The percentage of [35S]GTP gamma S bound in each sample is calculated as a percentage of that bound control sample. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |