Answer :
When GTP is bound, they come into an active role is true of the GTP-binding proteins that act as molecular switches inside cells.
When a GTP molecule substitutes a GDP molecule, the G protein switches, making the protein fully active. By attaching to proteins through this action, the G protein is able to send a signal, which in turn prompts a functional response in the cell. A GTP-binding protein that transmits signals to other signal transduction proteins inside the cell from a plasma membrane signal receptor also referred to as a G protein-coupled receptor, enzymatically active receptor protein that may simultaneously activate multiple pathways.
Signals sent outside the cell by GTP-binding proteins or G proteins lead to cellular changes. They function as molecular switches that turn on when GTP is bound and turn off when GDP is bound.
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