the function of structural domains of the beta-adrenergic receptor were probed by studying the ability of tryptic fragments of the receptor to catalyze the binding of guanosine-5'-o- ( 3-thiotriphosphate ( gtp gamma s ) to the gtp-binding regulatory protein , gs . beta-adrenergic receptor purified from turkey erythrocytes was treated with trypsin under nondenaturing conditions .
C0079469
gtp gamma s
C0018353
gtp