3.5.4.25: GTP cyclohydrolase II
This is an abbreviated version!
For detailed information about GTP cyclohydrolase II, go to the full flat file.
Word Map on EC 3.5.4.25
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3.5.4.25
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riboflavin
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anti-hcv
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lumazine
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guilliermondii
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famata
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gtp-cyclohydrolase
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2,5-diamino-6-ribosylamino-43h-pyrimidinone
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flavinogenic
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6,7-dimethyl-8-ribityllumazine
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pharmacology
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synthesis
- 3.5.4.25
- riboflavin
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anti-hcv
- lumazine
- guilliermondii
- famata
-
gtp-cyclohydrolase
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2,5-diamino-6-ribosylamino-43h-pyrimidinone
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flavinogenic
- 6,7-dimethyl-8-ribityllumazine
- pharmacology
- synthesis
Reaction
Synonyms
3,4-dihydroxy-2-butanone 4-phosphate synthase, GCH II, GCH II/III, GCH-II, gch2, GCHII, GTP 7,8-8,9-dihydrolase (diphosphate-forming), GTP cyclohydrolase 2, GTP cyclohydrolase II, GTP cyclohydrolase-II, GTP-8-formylhydrolase, GTPCH II, GTPCH-II, guanosine triphosphate cyclohydrolase II, guanosine triphosphate cyclohydrolase II/3,4-dihydroxy-2-butanone-4-phosphate synthase, guanosine-5'-triphosphate cyclohydrolase-II, More, NbRibA, ribA, ribA2, RIBIV, ToxB
ECTree
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Reaction
Reaction on EC 3.5.4.25 - GTP cyclohydrolase II
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GTP + 4 H2O = formate + 2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine + 2 phosphate
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GTP + 4 H2O = formate + 2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine + 2 phosphate
reaction mechanism
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GTP + 4 H2O = formate + 2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine + 2 phosphate
2 C-N bonds are hydrolysed, releasing formate, with simultaneous removal of the terminal diphosphate, reaction mechanism
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GTP + 4 H2O = formate + 2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine + 2 phosphate
ordered reaction mechanism, in which the hydrolytic release of diphosphate preceeds the hydrolytic attack of the imidazole ring, ring opening and formate release are dependent on zinc bound to the active site, overview
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GTP + 4 H2O = formate + 2,5-diamino-6-hydroxy-4-(5-phospho-D-ribosylamino)pyrimidine + 2 phosphate
RibA is a bifunctional enzyme possessing 3,4-dihydroxy-2-butanone 4-phosphate synthase activity, EC 4.1.99.12, located in the N-terminal half of the protein and GTP cyclohydrolase II activity of the C-terminal domain, overview
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