Reaction catalyzed by phosphoribosylformylglycinamidine cyclo-ligase (6.3.3.1)
ATP
+
=
ADP
+
+
ATP
+
2-(formamido)-N1-(5-phospho-D-ribosyl)acetamidine
=
ADP
+
phosphate
+
5-amino-1-(5-phospho-D-ribosyl)imidazole
