G Protein | GTPase |
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G proteins, also known as guanine nucleotide-binding proteins, are a family of proteins that act as molecular switches inside cells. They are involved in transmitting signals from a variety of stimuli outside a cell to its interior. Their activity is regulated by factors that control their ability to bind to and hydrolyze guanosine triphosphate (GTP) to guanosine diphosphate (GDP). When they are bound to GTP, they are ‘on’, and, when they are bound to GDP, they are 'off’. G proteins belong to the larger group of enzymes called GTPases. |
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