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Related Experiment Videos

Discrimination among E. coli tRNAs with a long variable arm

H Asahara1, H Himeno, K Tamura

  • 1Institute of Space and Astronautical Science, Kanagawa, Japan.

Nucleic Acids Symposium Series
|January 1, 1993
PubMed
Summary

Bacterial leucyl- and seryl-tRNA synthetases distinguish specific transfer RNAs (tRNAs) using distinct recognition mechanisms. Leucyl-tRNA synthetase targets specific nucleotides, while seryl-tRNA synthetase recognizes structural features of the tRNA variable arm.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transfer RNAs (tRNAs) are essential molecules for protein synthesis, with distinct structural classes.
  • Class II tRNAs, including tRNA(Ser), tRNA(Leu), and tRNA(Tyr) in E. coli, are characterized by a long variable arm.
  • Aminoacyl-tRNA synthetases (aaRSs) are responsible for attaching the correct amino acid to its cognate tRNA.

Purpose of the Study:

  • To investigate the molecular mechanisms by which leucyl-tRNA synthetase and seryl-tRNA synthetase discriminate their cognate tRNA isoacceptors among class II tRNAs.
  • To identify specific identity elements and structural features crucial for tRNA recognition by these synthetases.

Main Methods:

  • Enzymatic assays were performed to determine kinetic parameters.
  • Site-directed mutagenesis was used to create various mutated class II tRNA transcripts.

Related Experiment Videos

  • Analysis focused on the interaction between mutated tRNA transcripts and purified leucyl- and seryl-tRNA synthetases.

    • Main Results:

    • Leucyl-tRNA synthetase was found to recognize specific nucleotides, Adenine at position 73 (A73) and Adenine at position 14 (A14) or its surrounding region.
    • Seryl-tRNA synthetase demonstrated non-specific base recognition of the long variable arm.
    • A specific base pair, Cytosine at position 2 paired with Guanine at position 71 (C2-G71) in the acceptor stem, acted as a negative identity element for seryl-tRNA synthetase.

    Conclusions:

    • Discrimination between class II tRNA isoacceptors by leucyl- and seryl-tRNA synthetases relies on distinct recognition strategies.
    • Leucyl-tRNA synthetase utilizes specific nucleotide recognition, whereas seryl-tRNA synthetase employs a combination of variable arm recognition and negative selection.
    • Differences in the tertiary structures of class II tRNAs are critical for accurate discrimination by these aminoacyl-tRNA synthetases.