Reaction catalyzed by GTP cyclohydrolase IIa (3.5.4.29) show all sequences for 3.5.4.29
+3
H2O
=
+2
GTP
+
3 H2O
=
2-amino-5-formylamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one
+
2 phosphate