GDP molecule

The GDP molecule consists of three moieties: The guanine ring, which is a nitrogen-containing heterocycle; the ribose sugar ring; and the diphosphate group, with purple atoms being phosphorus. The abbreviation GDP stands for guanosine diphosphate. The active, "on" form of the ras protein contains the triphosphate (GTP), which is hydrolysed to the diphosphate by the enzyme. This reaction is much enhanced by interactions with Ras-GAP.

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