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GTP cyclohydrolase IIa

From Wikipedia, the free encyclopedia
GTP cyclohydrolase IIa
Identifiers
EC no.3.5.4.29
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
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NCBIproteins

In enzymology, a GTP cyclohydrolase IIa (EC 3.5.4.29) is an enzyme that catalyzes the chemical reaction

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

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  • 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.