Structure of nondiscriminating glutamyl-tRNA synthetase from Thermotoga maritima

Acta Crystallogr D Biol Crystallogr. 2010 Jul;66(Pt 7):813-20. doi: 10.1107/S0907444910019086. Epub 2010 Jun 19.

Abstract

Aminoacyl-tRNA synthetases produce aminoacyl-tRNAs from the substrate tRNA and its cognate amino acid with the aid of ATP. Two types of glutamyl-tRNA synthetase (GluRS) have been discovered: discriminating GluRS (D-GluRS) and nondiscriminating GluRS (ND-GluRS). D-GluRS glutamylates tRNA(Glu) only, while ND-GluRS glutamylates both tRNA(Glu) and tRNA(Gln). ND-GluRS produces the intermediate Glu-tRNA(Gln), which is converted to Gln-tRNA(Gln) by Glu-tRNA(Gln) amidotransferase. Two GluRS homologues from Thermotoga maritima, TM1875 and TM1351, have been biochemically characterized and it has been clarified that only TM1875 functions as an ND-GluRS. Furthermore, the crystal structure of the T. maritima ND-GluRS, TM1875, was determined in complex with a Glu-AMP analogue at 2.0 A resolution. The T. maritima ND-GluRS contains a characteristic structure in the connective-peptide domain, which is inserted into the catalytic Rossmann-fold domain. The glutamylation ability of tRNA(Gln) by ND-GluRS was measured in the presence of the bacterial Glu-tRNA(Gln) amidotransferase GatCAB. Interestingly, the glutamylation efficiency was not affected even in the presence of excess GatCAB. Therefore, GluRS avoids competition with GatCAB and glutamylates tRNA(Gln).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Conserved Sequence
  • Crystallography, X-Ray
  • Glutamate-tRNA Ligase / chemistry*
  • Glutamate-tRNA Ligase / metabolism
  • Models, Molecular
  • Molecular Sequence Data
  • Protein Structure, Tertiary
  • RNA, Transfer, Amino Acyl / metabolism
  • Sequence Alignment
  • Structural Homology, Protein
  • Thermotoga maritima / enzymology*

Substances

  • RNA, Transfer, Amino Acyl
  • Glutamate-tRNA Ligase