In enzymology, a GTP cyclohydrolase IIa (EC 3.5.4.29) is an enzyme that catalyzes the chemical reaction
| GTP cyclohydrolase IIa | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 3.5.4.29 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
- GTP + 3 H2O 2-amino-5-formylamino-6-(5-phosphoribosylamino)pyrimidin-4(3H)-one + 2 phosphate
Thus, the two substrates of this enzyme are GTP and H2O, whereas its two products are 2-amino-5-formylamino-6-(5-phosphoribosylamino)pyrimidin-4(3H)-one and phosphate.
This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is GTP 8,9-hydrolase (phosphate-forming).
References edit
- Graham DE, Xu H, White RH (2002). "A member of a new class of GTP cyclohydrolases produces formylaminopyrimidine nucleotide monophosphates". Biochemistry. 41 (50): 15074–84. doi:10.1021/bi0268798. PMID 12475257.
