Guanosine Diphosphate (GDP)

GDP is nucleotide intermediate in synthesis of GTP. GDP is produced from GMP via the reaction below catalyzed by guanylate kinase:

GMP + ATP <=> GDP + ADP

The interconversions of GTP and GDP by the G-proteins is a critical component of controlling cellular processes (see here)

See also: GTP, Nucleotides, Guanine, Nucleotide Salvage Synthesis, De Novo Biosynthesis of Purine Nucleotides