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Divergence of selenocysteine tRNA recognition by archaeal and eukaryotic O -phosphoseryl-tRNASec kinase

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkn036· OSTI ID:1625437
 [1];  [2];  [3]
  1. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry; DOE/OSTI
  2. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry
  3. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry; Yale Univ., New Haven, CT (United States). Dept. of Chemistry
Selenocysteine (Sec) biosynthesis in archaea and eukaryotes requires three steps: serylation of tRNASec by seryl-tRNA synthetase (SerRS), phosphorylation of Ser-tRNASec by O-phosphoseryl-tRNASec kinase (PSTK), and conversion of O-phosphoseryl-tRNASec (Sep-tRNASec) by SeptRNA:Sec-tRNA synthase (SepSecS) to SectRNASec. Although SerRS recognizes both tRNASec and tRNASer species, PSTK must discriminate SertRNASec from Ser-tRNASer. Based on a comparison of the sequences and secondary structures of archaeal tRNASec and tRNASer, we introduced mutations into Methanococcus maripaludis tRNASec to investigate how Methanocaldococcus jannaschii PSTK distinguishes tRNASec from tRNASer. Unlike eukaryotic PSTK, the archaeal enzyme was found to recognize the acceptor stem rather than the length and secondary structure of the D-stem. While the D-arm and T-loop provide minor identity elements, the acceptor stem base pairs G2-C71 and C3-G70 in tRNASec were crucial for discrimination from tRNASer. Furthermore, the A5-U68 base pair in tRNASer has some antideterminant properties for PSTK. Transplantation of these identity elements into the tRNASerUGA scaffold resulted in phosphorylation of the chimeric Ser-tRNA. The chimera was able to stimulate the ATPase activity of PSTK albeit at a lower level than tRNASec, whereas tRNASer did not. Additionally, the seryl moiety of Ser-tRNASec is not required for enzyme recognition, as PSTK efficiently phosphorylated Thr-tRNASec.
Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI ID:
1625437
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 6 Vol. 36; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

A tRNA-dependent cysteine biosynthesis enzyme recognizes the selenocysteine-specific tRNA in Escherichia coli journal May 2010
A synthetic tRNA for EF-Tu mediated selenocysteine incorporation in vivo and in vitro journal July 2015
From one amino acid to another: tRNA-dependent amino acid biosynthesis journal February 2008
Crystal structure of human selenocysteine tRNA journal August 2009
C-terminal domain of archaeal O -phosphoseryl-tRNA kinase displays large-scale motion to bind the 7-bp D-stem of archaeal tRNA Sec journal September 2010
Tertiary structure of bacterial selenocysteine tRNA journal May 2013
Kti12, a PSTK-like tRNA dependent ATPase essential for tRNA modification by Elongator journal March 2019
Computational identification of the selenocysteine tRNA (tRNASec) in genomes journal February 2017
Synthesis and decoding of selenocysteine and human health journal December 2012
Designing seryl‐ tRNA synthetase for improved serylation of selenocysteine tRNA s journal October 2018
tRNA acceptor-stem and anticodon bases embed separate features of amino acid chemistry journal November 2015
tRNAscan-SE 2.0: improved detection and functional classification of transfer RNA genes journal August 2021
Genetic analysis of selenocysteine biosynthesis in the archaeon Methanococcus maripaludis journal May 2011
Non-canonical roles of tRNAs and tRNA mimics in bacterial cell biology journal June 2016

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