5-(carboxyamino)imidazole ribonucleotide synthase

5-(carboxyamino)imidazole ribonucleotide synthase
Identifiers
EC number 6.3.4.18
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum

In enzymology, a 5-(carboxyamino)imidazole ribonucleotide synthase (EC 6.3.4.18) is an enzyme that catalyzes the chemical reaction

ATP + 5-amino-1-(5-phospho-D-ribosyl)imidazole + HCO3 \rightleftharpoons ADP + phosphate + 5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole

The 3 substrates of this enzyme are ATP, 5-amino-1-(5-phospho-D-ribosyl)imidazole ("AIR"), and HCO3, whereas its 3 products are ADP, phosphate, and 5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole.

This enzyme belongs to the family of ligases, specifically those forming generic carbon-nitrogen bonds. The systematic name of this enzyme class is 5-amino-1-(5-phospho-D-ribosyl)imidazole:carbon-dioxide ligase (ADP-forming). Other names in common use include N5-CAIR synthetase, N5-carboxyaminoimidazole ribonucleotide synthetase, and PurK.

References

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