GMP synthetase is a glutamine amidotransferase from the de novo purine biosynthetic pathway. This family is the C-terminal domain specific to the GMP synthases Swiss:P49915 EC:6.3.5.2. In prokaryotes this domain mediates dimerisation. Eukaryotic GMP synthases are monomers. This domain in eukaryotes includes several large insertions that may form globular domains.

1: The crystal structure of GMP synthetase reveals a novel catalytic triad and is a structural paradigm for two enzyme families. Tesmer JJ, Klem TJ, Deras ML, Davisson VJ, Smith JL; Nat Struct Biol 1996;3:74-86. PMID:8548458