EC - Aminoimidazole riboside kinase

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IntEnz Enzyme Nomenclature


Accepted name:
aminoimidazole riboside kinase
Other name:
STM4066 (locus name)
Systematic name:
ATP:5-amino-1-(β-D-ribosyl)imidazole 5'-phosphotransferase



The enzyme, characterized from the bacterium Salmonella enterica, can phosphorylate exogeneously-provided 5-amino-1-(β-D-ribosyl)imidazole to form 5-amino-1-(5-phospho-β-D-ribosyl)imidazole (AIR), an important intermediate in the production of both purine mononucleotides and the hydroxymethyl pyrimidine moiety of thiamine.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB


  1. Dougherty, M., Downs, D. M.
    The stm4066 gene product of Salmonella enterica serovar Typhimurium has aminoimidazole riboside (AIRs) kinase activity and allows AIRs to satisfy the thiamine requirement of pur mutant strains.
    J. Bacteriol. 185 : 332-339 (2003). [PMID: 12486071]
  2. Zhang, Y., Dougherty, M., Downs, D. M., Ealick, S. E.
    Crystal structure of an aminoimidazole riboside kinase from Salmonella enterica: implications for the evolution of the ribokinase superfamily.
    Structure 12 : 1809-1821 (2004). [PMID: 15458630]

[EC created 2018]