Eukaryotic group of SAICAR synthetases represented by the Drosophila melanogaster, N-terminal, SAICAR synthetase domain of bifunctional Ade5. The Ade5 gene product (CAIR-SAICARs) catalyzes the sixth and seventh steps of the de novo biosynthesis of purine nucleotides (also reported as seventh and eighth steps). SAICAR synthetase converts 5-aminoimidazole-4-carboxyribonucleotide (CAIR), ATP, and L-aspartate into 5-aminoimidazole-4-(N-succinylcarboxamide) ribonucleotide (SAICAR), ADP, and phosphate.
Jiyao W et al.(2023). "The conserved domain database in 2023.",