EC - TRNA 4-demethylwyosine synthase (AdoMet-dependent)

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IntEnz Enzyme Nomenclature


Accepted name:
tRNA 4-demethylwyosine synthase (AdoMet-dependent)
Other name:
Systematic name:
tRNAPhe N1-methylguanine,pyruvate acetaldehyde-lyase (tRNAPhe 4-demethylwyosine-forming, decarboxylating, dehydrating)




This enzyme, which is a member of the superfamily of S-adenosyl-L-methionine-dependent radical (radical AdoMet) enzymes, binds two [4Fe-4S] clusters [3,4]. Carbons C2 and C3 from pyruvate are incorporated into 4-demethylwyosine [3]. The enzyme is found in eukaryotes where it is part of the pathway for wybutosine synthesis, and in archaea, where it is involved in the biosynthesis of archaeal wye bases, such as wyosine, isowyosine, and methylwyosine.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
Gene Ontology: GO:0102521
UniProtKB/Swiss-Prot: (17) [show] [UniProt]


  1. Goto-Ito, S., Ishii, R., Ito, T., Shibata, R., Fusatomi, E., Sekine, S. I., Bessho, Y., Yokoyama, S.
    Structure of an archaeal TYW1, the enzyme catalyzing the second step of wye-base biosynthesis.
    Acta Crystallogr. D Biol. Crystallogr. 63 : 1059-1068 (2007). [PMID: 17881823]
  2. Suzuki, Y., Noma, A., Suzuki, T., Senda, M., Senda, T., Ishitani, R., Nureki, O.
    Crystal structure of the radical SAM enzyme catalyzing tricyclic modified base formation in tRNA.
    J. Mol. Biol. 372 : 1204-1214 (2007). [PMID: 17727881]
  3. Young, A. P., Bandarian, V.
    Pyruvate is the source of the two carbons that are required for formation of the imidazoline ring of 4-demethylwyosine.
    Biochemistry 50 : 10573-10575 (2011). [PMID: 22026549]
  4. Perche-Letuvee, P., Kathirvelu, V., Berggren, G., Clemancey, M., Latour, J. M., Maurel, V., Douki, T., Armengaud, J., Mulliez, E., Fontecave, M., Garcia-Serres, R., Gambarelli, S., Atta, M.
    4-Demethylwyosine synthase from Pyrococcus abyssi is a radical-S-adenosyl-L-methionine enzyme with an additional [4Fe-4S](+2) cluster that interacts with the pyruvate co-substrate.
    J. Biol. Chem. 287 : 41174-41185 (2012). [PMID: 23043105]

[EC created 2013]