GTP cyclohydrolase II activity
Catalysis of the reaction: GTP + 4 H2O = 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + formate + 3 H+ + 2 phosphate.
GO:0003933
GTP cyclohydrolase activity
is_a
GTP 7,8-8,9-dihydrolase (diphosphate-forming)
related
GTP-8-formylhydrolase activity
related
guanosine triphosphate cyclohydrolase II
related
SPAP27G11.09c SPAC1002.19