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Related Experiment Videos

Glutamyl-tRNA sythetase

W Freist1, D H Gauss, D Söll

  • 1Max-Planck-Institut für experimentelle Medizin, Göttingen, Germany.

Biological Chemistry
|January 13, 1998
PubMed
Summary
This summary is machine-generated.

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Glutamyl-tRNA synthetase (GluRS) and glutaminyl-tRNA synthetase (GlnRS) evolved from a common ancestor. GluRS structure and function are detailed, including its unique tRNA recognition mechanism.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Glutamyl-tRNA synthetase (GluRS) is a class I aminoacyl-tRNA synthetase with structural and catalytic similarities to glutaminyl-tRNA synthetase (GlnRS).
  • Phylogenetic studies suggest GluRS and GlnRS diverged from an ancestral enzyme responsible for glutamylation of tRNA(Glu) and tRNA(Gln).
  • Two distinct pathways for tRNA charging exist: one involving a specific amidotransferase for Gln-tRNA(Gln) synthesis, and another with separate GluRS and GlnRS enzymes in eukaryotes and some bacteria.

Purpose of the Study:

  • To elucidate the structural and functional characteristics of Glutamyl-tRNA synthetase (GluRS).
  • To understand the evolutionary divergence of GluRS and GlnRS.
  • To investigate the tRNA recognition mechanisms employed by GluRS.

Main Methods:

Related Experiment Videos

  • Phylogenetic analysis to trace evolutionary origins.
  • Structural determination via X-ray crystallography of Thermus thermophilus GluRS.
  • Biochemical assays to study catalytic mechanisms, including ATP/PPi exchange reactions.
  • Analysis of enzyme-tRNA interactions.

Main Results:

  • The crystal structure of Thermus thermophilus GluRS reveals a bent cylinder with four domains, featuring a Rossmann fold in the N-terminal half and a GluRS-specific C-terminal half.
  • GluRS, GlnRS, and ArgRS share a unique property of catalyzing ATP/PPi pyrophosphate exchange only in the presence of cognate tRNA.
  • Investigations confirm GluRS interacts with multiple regions of tRNA(Glu), including the acceptor stem, anticodon, dihydrouridine arm, and variable loop.

Conclusions:

  • GluRS exhibits distinct structural features compared to other class I synthetases, particularly in its C-terminal domain.
  • The tRNA-dependent ATP/PPi exchange reaction highlights a conserved regulatory mechanism among specific aminoacyl-tRNA synthetases.
  • GluRS employs a complex recognition strategy for its cognate tRNA(Glu), involving interactions beyond the canonical acceptor stem and anticodon loop.