Phosphoribosylglycinamide synthetase catalyses the second step in the de novo biosynthesis of purine. The reaction catalysed by Phosphoribosylglycinamide synthetase is the ATP- dependent addition of 5-phosphoribosylamine to glycine to form 5'phosphoribosylglycinamide. This domain is related to the N-terminal domain of biotin carboxylase/carbamoyl phosphate synthetase (see Pfam:PF00289). This domain is structurally related to the PreATP-grasp domain.

1: Nucleotide sequence analysis of genes purH and purD involved in the de novo purine nucleotide biosynthesis of Escherichia coli. Aiba A, Mizobuchi K; J Biol Chem 1989;264:21239-21246. PMID:2687276

2: X-ray crystal structure of glycinamide ribonucleotide synthetase from Escherichia coli. Wang W, Kappock TJ, Stubbe J, Ealick SE; Biochemistry 1998;37:15647-15662. PMID:9843369