GO:0003935

GTP cyclohydrolase II activity

Details: 
Catalysis of the reaction: GTP + 3 H(2)O = 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + diphosphate + formate + 3 H(+).
GO Category: 
MF
GTP_cyclohydro2