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Related Experiment Videos

Trbp111 selectively binds a noncovalently assembled tRNA-like structure.

Tetsuo Kushiro1, Paul Schimmel

  • 1The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. schimmel@scripps.edu

Proceedings of the National Academy of Sciences of the United States of America
|December 14, 2002
PubMed
Summary

The ancient protein Trbp111 binds to noncovalently assembled transfer RNA (tRNA)-like structures, specifically recognizing the L-shaped corner. This suggests Trbp111 may have chaperoned early tRNA evolution by stabilizing these crucial RNA intermediates.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Evolutionary Biology

Background:

  • Transfer RNAs (tRNAs) are central to the genetic code, linking amino acids to anticodons.
  • The L-shaped tRNA structure comprises two domains joined by tertiary interactions at a corner.
  • tRNA may have evolved from noncovalently assembled heterodimeric intermediates.

Purpose of the Study:

  • To investigate the role of the ancient protein Trbp111 in the context of early tRNA evolution.
  • To determine if Trbp111 interacts with tRNA precursors or individual tRNA domains.
  • To understand the structural requirements for Trbp111 binding to RNA.

Main Methods:

  • Biochemical assays to test Trbp111 binding to RNA structures.
  • Utilizing noncovalently assembled tRNA-like structures and individual RNA domains.

Related Experiment Videos

  • Analyzing RNA domain selection by Trbp111 in mixtures.

    • Main Results:

    • Trbp111 specifically binds to noncovalently assembled tRNA-like structures.
    • Trbp111 does not interact with individual tRNA domains.
    • Trbp111 binding is dependent on the formation of the L-shaped tRNA-like corner.
    • Trbp111 selects RNA domains capable of forming the L-like structure.

    Conclusions:

    • Trbp111 acts as a structure-specific cofactor for assembling and stabilizing tRNA-like RNA dimers.
    • Trbp111 may have played a historical role in the evolution of tRNA by chaperoning early RNA structures.
    • The findings provide insights into the early stages of genetic code evolution.