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Biosynthesis of Selenocysteine on Its tRNA in Eukaryotes
Open accessAbstract
Selenocysteine (Sec) is cotranslationally inserted into protein in response to UGA codons and is the 21st amino acid in the genetic code. However, the means by which Sec is synthesized in eukaryotes is not known. Herein, comparative genomics and experimental analyses revealed that the mammalian Sec synthase (SecS) is the previously identified pyridoxal phosphate-containing protein known as the soluble liver antigen. SecS required selenophosphate and O-phosphoseryl-tRNA([Ser]Sec) as substrates to generate selenocysteyl-tRNA([Ser]Sec). Moreover, it was found that Sec was synthesized on the tRNA scaffold from selenide, ATP, and serine using tRNA([Ser]Sec), seryl-tRNA synthetase, O-phosphoseryl-tRNA([Ser]Sec) kinase, selenophosphate synthetase, and SecS. By identifying the pathway of Sec biosynthesis in mammals, this study not only functionally characterized SecS but also assigned the function of the O-phosphoseryl-tRNA([Ser]Sec) kinase. In addition, we found that selenophosphate synthetase 2 could synthesize monoselenophosphate in vitro but selenophosphate synthetase 1 could not. Conservation of the overall pathway of Sec biosynthesis suggests that this pathway is also active in other eukaryotes and archaea that synthesize selenoproteins.
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“they share a common origin and so this pathways seems extremely ancient and is also very widespread, contrary to what the Reviewer says [66].”
ResultZhang, Y., & Gladyshev, V. N. (2009) · Chemical Reviews · doi:10.1021/cr800557s · Cited by 143
Self-citationYuan, J., O'Donoghue, P., Ambrogelly, A., Gundllapalli, S., Sherrer, R. L., Palioura, S., Simonović, M., & Söll, D. (2010) · FEBS Letters · doi:10.1016/j.febslet.2009.11.005 · Cited by 76
Metadata
- Authors
- Xu, X.-M., Carlson, B. A., Mix, H., Zhang, Y., Saira, K., Glass, R. S., Berry, M. J., Gladyshev, V. N., & Hatfield, D. L.
- Venue
- PLoS Biology
- Publisher
- Public Library of Science (PLoS)
- Published
- 2006-12-26
- Volume
- 5
- Issue
- 1
- Pages
- e4
- ISSN
- 1544-9173 (ISSN-L)
- 1545-7885
- OpenAlex
- W2011427262
- Cited by
- 299
- References
- 0
- FWCI
- 20.96
- Type
- journal article
- Language
- en
- Open access
- gold
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