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Related Experiment Videos

Ternary complex between elongation factor Tu.GTP and Phe-tRNA(Phe)

C Förster1, S Limmer, S Ribeiro

  • 1Laboratorium für Biochemie, Universität Bayreuth, Germany.

Biochimie
|January 1, 1993
PubMed
Summary

Aminoacylation of yeast tRNA(Phe) with phenylalanine does not alter its structure. However, forming a ternary complex with elongation factor Tu.GTP causes minor conformational changes, preserving the tRNA

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Transfer RNA (tRNA) plays a crucial role in protein synthesis by carrying amino acids to the ribosome.
  • Elongation Factor Tu (EF-Tu) is essential for delivering aminoacyl-tRNAs to the ribosome during translation.
  • Understanding the structural dynamics of tRNA upon aminoacylation and EF-Tu binding is key to deciphering translation mechanisms.

Purpose of the Study:

  • To investigate the structural effects of phenylalanine aminoacylation on yeast tRNA(Phe).
  • To examine the conformational changes in yeast tRNA(Phe) upon forming a ternary complex with elongation factor Tu and GTP.
  • To determine the structural integrity of tRNA(Phe) within the ternary complex.

Main Methods:

  • Proton Nuclear Magnetic Resonance (1H-NMR) spectroscopy was employed to monitor structural changes.

Related Experiment Videos

  • Analysis of imino and NH proton resonances provided insights into base pairing and tertiary structure.
  • A structural model of the ternary complex was constructed based on known structures of yeast tRNA(Phe) and Thermus thermophilus EF-Tu.

    • Main Results:

    • Phenylalanine esterification to tRNA(Phe) did not alter its secondary or tertiary base pair interactions.
    • Formation of the Phe-tRNA(Phe)-EF-Tu-GTP ternary complex led to broadened imino proton resonances and slight chemical shift changes, indicating minor conformational rearrangements.
    • The characteristic L-shaped tertiary structure of tRNA(Phe) was preserved in the ternary complex, with most base pairs remaining intact.

    Conclusions:

    • Aminoacylation of tRNA(Phe) alone does not induce significant structural changes.
    • Binding to EF-Tu.GTP induces subtle conformational adjustments in tRNA(Phe) but maintains its overall tertiary structure.
    • The study provides structural insights into the tRNA-EF-Tu interaction crucial for efficient protein synthesis.