試題詳解

45.The Gα subunit of GTP-binding proteins in G protein-coupled receptors (GPCRs) commonly has the following characteristics, except

(A)Hormone binding to its target GPCR can stimulate Gβy to release Gα into the cytoplasm.
(B) GDP binding to the Gβy components is essential for the release of Gα. 
(C) Certain types of Gα subunit can bind to adenylate cyclase and activate this enzyme to produce cAMP.
(D) Gα subunits typically possess relatively weak GTP hydrolysis activity. 

(E) GTP hydrolysis results in dissociation of Gα-adenylate cyclase complex.