Reaction catalyzed by GTP cyclohydrolase IIa (3.5.4.29) show all sequences for 3.5.4.29
+
H2O
=
+
beta,gamma-methylene-GTP
+
H2O
=
2-amino-5-formylamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine
+
methyl phosphonate