1. Chemicals and Equipment
DB Buffer, PB, cAMP, cAMP [2, 8- 3H] (25 Ci/mmol, 1.0 mCi/ml, 32, 000 nM), 10 mM GTPgS, Wacker silicone AR-20, Reagiergefab test tubes (Sarstedt), millipore 5 micrometer filter, 0.1M DTT.
2. Prepare Cells
a. Wash cells with DB and resuspend them to 2 X 107 / ml
b. Shake cells at 120 rpm for 1 hour
c. Pulse cells with 100 nM cAMP for 4 hours
d. Basolate cells with 2 mM caffeine for 30 min
Following steps are carried out at 4 0C
e. Wash cells with DB and resuspend at 5 X 107 / ml.
Spin 10K, 5 min and resuspend membranes in PB at 108 / ml equivalent.
Prepare reaction mixture plus and minus GTPgS