Assay Method Information

Assay Name:  [35S]GTPγS Binding Assay
Description:  For receptor signaling, membranes (10 μg protein) from either ICR mouse cerebellum mice (6-8 weeks old; Enviga International, Indianapolis, Indiana, United States of America) or HEK cells stably expressing CB1 receptor were preincubated in assay buffer for 10 min with 3 units/ml adenosine deaminase then incubated for 60 min at 30° C. with 30 μM GDP and 0.1 nM [35S]GTPγS (Perkin Elmer Life Sciences, Boston, Massachusetts, United States of America). Non-specific binding was determined by adding 30 μM unlabeled GTPγS. Concentration response curves for allosteric modulators were conducted in the presence of CP55,940 (100 nM or 1 μM) to calculate IC50 values.
Affinity data for this assay
 

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