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Related Experiment Videos

Trans-editing of mischarged tRNAs.

Ivan Ahel1, Dragana Korencic, Michael Ibba

  • 1Department of Molecular Biophysics, Yale University, New Haven, CT 06520-8114, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 10, 2003
PubMed
Summary

Researchers discovered novel editing proteins that act independently of aminoacyl-tRNA synthetases (aaRSs). These proteins specifically remove incorrect amino acids from tRNAs, linking early aaRS evolution to modern enzymes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Aminoacyl-tRNA synthetases (aaRSs) are crucial enzymes for protein synthesis, attaching specific amino acids to cognate tRNAs.
  • aaRSs possess catalytic cores and additional domains that enhance specificity and efficiency through cis-editing.
  • The evolutionary origins of aaRSs are linked to simpler catalytic core structures.

Purpose of the Study:

  • To investigate tRNA-dependent trans-editing mechanisms mediated by aaRS-like proteins.
  • To explore the function of freestanding editing domains homologous to those found in aaRSs.
  • To establish a link between ancestral aaRSs and modern enzymes with appended modules.

Main Methods:

  • Characterization of freestanding aaRS-like editing domains from various organisms (e.g., Clostridium sticklandii, Methanosarcina barkeri, Sulfolobus solfataricus).

Related Experiment Videos

  • Assays to determine the hydrolytic activity and specificity of these proteins on misacylated tRNA substrates.
  • Comparative analysis of these autonomous editing proteins with known aaRS editing domains.

    • Main Results:

    • Identification of PrdX protein (homologous to prolyl-tRNA synthetase editing domain) that specifically hydrolyzes Ala-tRNAPro.
    • Discovery of autonomous alanyl-tRNA synthetase-editing domain homologues (AlaX proteins) that hydrolyze Ser-tRNAAla and Gly-tRNAAla.
    • Demonstration of tRNA-dependent trans-editing activity by these isolated domains.

    Conclusions:

    • Autonomous editing proteins, separate from their cognate synthetases, can efficiently correct misacylated tRNAs.
    • These findings provide evidence for the modular evolution of aaRSs, with editing functions potentially existing independently before being integrated.
    • This work illuminates the evolutionary trajectory from basic catalytic cores to complex, multi-domain aaRS enzymes.