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Characterization and evolutionary history of an archaeal kinase involved in selenocysteinyl-tRNA formation

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkm1134· OSTI ID:1625422
 [1];  [2];  [3]
  1. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics. Dept. of Biochemistry; DOE/OSTI
  2. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics. Dept. of Biochemistry
  3. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics. Dept. of Biochemistry. Dept. of Chemistry
Selenocysteine (Sec)-decoding archaea and eukaryotes employ a unique route of Sec-tRNASec synthesis in which O-phosphoseryl-tRNASec kinase (PSTK) phosphorylates Ser-tRNASec to produce the O-phosphoseryl-tRNASec (Sep-tRNASec) substrate that Sep-tRNA:Sec-tRNA synthase (SepSecS) converts to Sec-tRNASec. This study presents a biochemical characterization of Methanocaldococcus jannaschii PSTK, including kinetics of Sep-tRNASec formation (Km for Ser-tRNASec of 40 nM and ATP of 2.6 mM). PSTK binds both Ser-tRNASec and tRNASec with high affinity (Kd values of 53 nM and 39 nM, respectively). The ATPase activity of PSTK may be activated via an induced fit mechanism in which binding of tRNASec specifically stimulates hydrolysis. Albeit with lower activity than ATP, PSTK utilizes GTP, CTP, UTP and dATP as phosphatedonors. Homology with related kinases allowed prediction of the ATPase active site, comprised of phosphate-binding loop (P-loop), Walker B and RxxxR motifs. Gly14, Lys17, Ser18, Asp41, Arg116 and Arg120 mutations resulted in enzymes with decreased activity highlighting the importance of these conserved motifs in PSTK catalysis both in vivo and in vitro. Phylogenetic analysis of PSTK in the context of its ‘DxTN’ kinase family shows that PSTK co-evolved precisely with SepSecS and indicates the presence of a previously unidentified PSTK in Plasmodium species.
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:
1625422
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 4 Vol. 36; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

From one amino acid to another: tRNA-dependent amino acid biosynthesis journal February 2008
Divergence of selenocysteine tRNA recognition by archaeal and eukaryotic O -phosphoseryl-tRNA Sec kinase journal February 2008
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
Kti12, a PSTK-like tRNA dependent ATPase essential for tRNA modification by Elongator journal March 2019
The Last Universal Common Ancestor: emergence, constitution and genetic legacy of an elusive forerunner journal January 2008
Evolutionary Patterns in the Sequence and Structure of Transfer RNA: A Window into Early Translation and the Genetic Code journal July 2008
Use of a Yeast TRNase Killer Toxin to Diagnose Kti12 Motifs Required for TRNA Modification by Elongator posted_content August 2017
Rewiring Translation for Elongation Factor Tu-Dependent Selenocysteine Incorporation journal November 2012
Rewiring Translation for Elongation Factor Tu-Dependent Selenocysteine Incorporation journal November 2012
A mutation in the gene for polynucleotide kinase of bacteriophage T4 K10 affects mRNA processing journal August 2013
Genetic analysis of selenocysteine biosynthesis in the archaeon Methanococcus maripaludis journal May 2011
Use of a Yeast tRNase Killer Toxin to Diagnose Kti12 Motifs Required for tRNA Modification by Elongator journal September 2017

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