IUBMB Enzyme Nomenclature


Accepted name: tRNA 2-(methylsulfanyl)-N6-isopentenyladenosine37 hydroxylase

Reaction: 2-(methylsulfanyl)-N6-prenyladenosine37 in tRNA + reduced acceptor + O2 = N6-[(2E)-4-hydroxy-3-methylbut-2-en-1-yl]-2-(methylsulfanyl)adenosine37 in tRNA + acceptor + H2O

Glossary: 2-(methylsulfanyl)-N6-prenyladenosine = N6-(3-methylbut-2-en-1-yl)-2-(methylsulfanyl)adenosine

Other name(s): miaE (gene name); tRNA 2-methylthio-N6-isopentenyl adenosine(37) hydroxylase; tRNA 2-(methylsulfanyl)-N6-dimethylallyladenosine37 hydroxylase

Systematic name: tRNA 2-(methylsulfanyl)-N6-prenyladenosine37,donor:oxygen 4-oxidoreductase (trans-hydroxylating)

Comments: The enzyme, found only within a small subset of facultative anaerobic bacteria, belongs to the nonheme diiron family. The enzyme from Salmonella typhimurium was shown to catalyse a stereoselective (E) hydroxylation at the terminal C4-position of the prenyl group.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Persson, B.C. and Bjork, G.R. Isolation of the gene (miaE) encoding the hydroxylase involved in the synthesis of 2-methylthio-cis-ribozeatin in tRNA of Salmonella typhimurium and characterization of mutants. J. Bacteriol. 175 (1993) 7776-7785. [PMID: 8253666]

2. Persson, B.C., Olafsson, O., Lundgren, H.K., Hederstedt, L. and Bjork, G.R. The ms2io6A37 modification of tRNA in Salmonella typhimurium regulates growth on citric acid cycle intermediates. J. Bacteriol. 180 (1998) 3144-3151. [PMID: 9620964]

3. Corder, A.L., Subedi, B.P., Zhang, S., Dark, A.M., Foss, F.W., Jr. and Pierce, B.S. Peroxide-shunt substrate-specificity for the Salmonella typhimurium O2-dependent tRNA modifying monooxygenase (MiaE). Biochemistry 52 (2013) 6182-6196. [PMID: 23906247]

[EC created 2020]

Return to EC 1.14.99 home page
Return to EC 1.14 home page
Return to EC 1 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page