what-happens-to-the-alpha-subunit-of-protein-g-when-a-ligand-binds-to-a-g-protei

Question

What happens to the alpha subunit of protein G when a ligand binds to a G protein-coupled receptor?

Accepted Answer

GDP is replaced by GTP, activating the protein.

Answer

GTP is hydrolyzed to GDP, activating the protein.

Answer

GDP is phosphorylated to GTP, activating the protein.

Answer

GTP is replaced by GDP, deactivating the protein.