5-(carboxyamino)imidazole ribonucleotide synthase

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5-(Carboxyamino)imidazole ribonucleotide synthase
5-(Carboxyamino)imidazole ribonucleotide synthase
Identifiers
EC no.	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
PMC
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PubMed	articles
NCBI	proteins

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).

References

Meyer E, Leonard NJ, Bhat B, Stubbe J, Smith JM (1992). "Purification and characterization of the purE, purK, and purC gene products: identification of a previously unrecognized energy requirement in the purine biosynthetic pathway". Biochemistry. 31 (21): 5022–32. doi:10.1021/bi00136a016. PMID 1534690.
Mueller EJ, Meyer E, Rudolph J, Davisson VJ, Stubbe J (1994). "N5-carboxyaminoimidazole ribonucleotide: evidence for a new intermediate and two new enzymatic activities in the de novo purine biosynthetic pathway of Escherichia coli". Biochemistry. 33 (8): 2269–78. doi:10.1021/bi00174a038. PMID 8117684.
Thoden JB, Kappock TJ, Stubbe J, Holden HM (1999). "Three-dimensional structure of N5-carboxyaminoimidazole ribonucleotide synthetase: a member of the ATP grasp protein superfamily". Biochemistry. 38 (47): 15480–92. doi:10.1021/bi991618s. PMID 10569930.

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v t e Enzymes: CO CS and CN ligases (EC 6.1-6.3)
6.1: Carbon-Oxygen	Aminoacyl tRNA synthetase Alanine Arginine Asparagine Aspartate Cysteine D-Alanine—poly(phosphoribitol) ligase Glutamate Glutamine Glycine Histidine Isoleucine Leucine Lysine Methionine Phenylalanine Proline Serine Threonine Tryptophan Tyrosine Valine
6.2: Carbon-Sulfur	(2,2,3-trimethyl-5-oxocyclopent-3-enyl)acetyl-CoA synthase 2-furoate—CoA ligase 3-alpha,7-alpha-dihydroxy-5-beta-cholestanate—CoA ligase 3-hydroxybenzoate—CoA ligase 3-hydroxypropionyl-CoA synthase 4-chlorobenzoate—CoA ligase 4-Coumarate-CoA ligase 4-hydroxybenzoate—CoA ligase 6-carboxyhexanoate—CoA ligase Acetate—ACP ligase Acetate—CoA ligase (ADP-forming) Acetoacetate—CoA ligase Acetyl—CoA synthetase Acid—CoA ligase (GDP-forming) Anthranilate—CoA ligase Arachidonate—CoA ligase Benzoate—CoA ligase Biotin—CoA ligase (butirosin acyl-carrier protein)—L-glutamate ligase Butyrate—CoA ligase Cholate—CoA ligase Citrate—CoA ligase (citrate (pro-3S)-lyase) ligase Dicarboxylate—CoA ligase Glutarate—CoA ligase Long-chain-fatty-acid—ACP ligase Long-chain-fatty-acid—CoA ligase Malate—CoA ligase Malonate—CoA ligase o-Succinylbenzoate—CoA ligase Oxalate—CoA ligase Phenylacetate—CoA ligase Phytanate—CoA ligase Propionate—CoA ligase Succinate—CoA ligase (ADP-forming) Succinate—CoA ligase (GDP-forming) Succinyl—CoA synthetase trans-Feruloyl—CoA synthase
6.3: Carbon-Nitrogen	Glutamine synthetase Ubiquitin ligase Cullin Von Hippel–Lindau tumor suppressor UBE3A Mdm2 Anaphase-promoting complex UBR1 Glutathione synthetase CTP synthetase Adenylosuccinate synthase Argininosuccinate synthase Holocarboxylase synthetase GMP synthase Asparagine synthetase Carbamoyl phosphate synthetase I II Glutamate–cysteine ligase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)