Term Name:	GTP cyclohydrolase IV activity
Synonyms:	archaeal-specific GTP cyclohydrolase activity, Fe(2+)-dependent archaeal-specific GTP cyclohydrolase activity, MptA activity
Definition:	Catalysis of the reaction: GTP + H2O = 7,8-dihydroneopterin 2',3'-cyclic phosphate + diphosphate + formate + H+. This activity is part of the biosynthesis of methanopterin in Archaea, and requires Fe2+.
Ontology:	GO: Molecular Function [GO:0044682]    QuickGO    AmiGO