GTP cyclohydrolase IIa activity (Q22321014)
Catalysis of the reaction: GTP + 3 H(2)O = 2-amino-5-formylamino-6-(1-D-ribosylamino)pyrimidin-4(3H)-one 5'-phosphate + 3 H(+) + 2 phosphate.
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aliases GTP 8,9-hydrolase (phosphate-forming)
 GO:0043740
 GTP 8,9-dihydrolase (phosphate-forming)
description Catalysis of the reaction: GTP + 3 H(2)O = 2-amino-5-formylamino-6-(1-D-ribosylamino)pyrimidin-4(3H)-one 5'-phosphate + 3 H(+) + 2 phosphate.

External Links
(P665) R07306
(P686) GO:0043740