Action of alpha subunit of G-protein is:: (A) Binding of agonist, (B) Conversion of GDP to GTP, (C) Breakdown of GTP to GDP, (D) Internalization of receptors
Answer is C. Ans. (C) Breakdown of GTP to GDP(Ref: KDT 8th/e p54)Alpha subunit of G protein contains GTPase activity and thus dissociates GTP to form GDP. This result in re-uniting a subunit with b and g subunit