Genes, Enzymes and Coenzymes of Queuosine Biosynthesis in Procaryotes

Biochimie. 1994;76(12):1178-82. doi: 10.1016/0300-9084(94)90047-7.


In almost all known tRNAs that are specific for Asp, Asn, His or Tyr the wobble position of the anticodon is occupied by the hypermodified tRNA nucleoside queuosine. This unusual deazaguanine derivative is synthesised only in eubacteria. The biosynthesis, as investigated in Escherichia coli, is accomplished in four steps involving many unprecedented enzymatic reactions.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Bacteria / enzymology*
  • Bacteria / genetics
  • Bacteria / metabolism*
  • Genes, Bacterial*
  • Nucleoside Q / biosynthesis*


  • Nucleoside Q