The Enzyme Database

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Accepted name: O-phospho-L-seryl-tRNASec:L-selenocysteinyl-tRNA synthase
Reaction: O-phospho-L-seryl-tRNASec + selenophosphate + H2O = L-selenocysteinyl-tRNASec + 2 phosphate
Other name(s): MMPSepSecS; SepSecS; SLA/LP; O-phosphoseryl-tRNA:selenocysteinyl-tRNA synthase; O-phospho-L-seryl-tRNA:L-selenocysteinyl-tRNA synthase
Systematic name: selenophosphate:O-phospho-L-seryl-tRNASec selenium transferase
Comments: A pyridoxal-phosphate protein [4]. In archaea and eukarya selenocysteine formation is achieved by a two-step process: EC (O-phosphoseryl-tRNASec kinase) phosphorylates the endogenous L-seryl-tRNASec to O-phospho-L-seryl-tRNASec, and then this misacylated amino acid-tRNA species is converted to L-selenocysteinyl-tRNASec by Sep-tRNA:Sec-tRNA synthase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Palioura, S., Sherrer, R.L., Steitz, T.A., Soll, D. and Simonovic, M. The human SepSecS-tRNASec complex reveals the mechanism of selenocysteine formation. Science 325 (2009) 321–325. [DOI] [PMID: 19608919]
2.  Araiso, Y., Palioura, S., Ishitani, R., Sherrer, R.L., O'Donoghue, P., Yuan, J., Oshikane, H., Domae, N., Defranco, J., Soll, D. and Nureki, O. Structural insights into RNA-dependent eukaryal and archaeal selenocysteine formation. Nucleic Acids Res. 36 (2008) 1187–1199. [DOI] [PMID: 18158303]
3.  Aeby, E., Palioura, S., Pusnik, M., Marazzi, J., Lieberman, A., Ullu, E., Soll, D. and Schneider, A. The canonical pathway for selenocysteine insertion is dispensable in Trypanosomes. Proc. Natl. Acad. Sci. USA 106 (2009) 5088–5092. [DOI] [PMID: 19279205]
4.  Yuan, J., Palioura, S., Salazar, J.C., Su, D., O'Donoghue, P., Hohn, M.J., Cardoso, A.M., Whitman, W.B. and Soll, D. RNA-dependent conversion of phosphoserine forms selenocysteine in eukaryotes and archaea. Proc. Natl. Acad. Sci. USA 103 (2006) 18923–18927. [DOI] [PMID: 17142313]
[EC created 2009, modified 2014]

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