Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/ijms23147973
Keywords
2-selenouridine; wobble nucleoside; diselenide; oxidative stress; tRNA
Funding
- National Science Center in Poland [UMO2018/29/B/ST5/02509]
- Lodz University of Technology
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences
- National Science Center in Poland
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The 2-selenouridine component of tRNA is more susceptible to oxidation and exhibits antioxidant potential in cells. Additionally, new oligomeric nucleosides are formed during the oxidation process.
The 5-substituted 2-selenouridines are natural components of the bacterial tRNA epitranscriptome. Because selenium-containing biomolecules are redox-active entities, the oxidation susceptibility of 2-selenouridine (Se2U) was studied in the presence of hydrogen peroxide under various conditions and compared with previously reported data for 2-thiouridine (S2U). It was found that Se2U is more susceptible to oxidation and converted in the first step to the corresponding diselenide (Se2U)(2), an unstable intermediate that decomposes to uridine and selenium. The reversibility of the oxidized state of Se2U was demonstrated by the efficient reduction of (Se2U)(2) to Se2U in the presence of common reducing agents. Thus, the 2-selenouridine component of tRNA may have antioxidant potential in cells because of its ability to react with both cellular ROS components and reducing agents. Interestingly, in the course of the reactions studied, we found that (Se2U)(2) reacts with Se2U to form new 'oligomeric nucleosides ' as linear and cyclic byproducts.
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