Reaction catalyzed by GTP cyclohydrolase II (3.5.4.25) show all sequences for 3.5.4.25
+4
H2O
=
+
+2
GTP
+
4 H2O
=
formate
+
2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine
+
2 phosphate