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Functional tRNAs with altered 3' ends

M O'Connor1, N M Willis, L Bossi

  • 1Department of Human Genetics, University of Utah, Salt Lake City 84112.

The EMBO Journal
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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Altered transfer RNA (tRNA) CCA ends, crucial for amino acid attachment, can lead to altered gene expression and frameshifting errors during protein synthesis.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The 3' CCA end of transfer RNAs (tRNAs) is highly conserved and essential for amino acid attachment.
  • Despite its conservation, functional tRNA mutants with modified CCA ends have been identified.

Purpose of the Study:

  • To investigate the functional consequences of altering the CCA end of tRNAs.
  • To characterize the impact of CCA end mutations on gene regulation and translation fidelity.

Main Methods:

  • Isolation and characterization of functional tRNA mutants with altered CCA ends in Salmonella typhimurium and Escherichia coli.
  • In vivo functional assays to assess tRNA activity, gene expression, and translational accuracy.

Main Results:

Related Experiment Videos

  • A tRNA(His) mutant with a UCA end caused de-repression of the histidine biosynthetic operon.
  • Mutant tRNA(Val1) with GCA or ACA ends induced frameshifting and read-through of downstream stop codons.
  • Constructed tRNA(His) mutants with ACA or GCA ends were nonfunctional in vivo.

Conclusions:

  • Disruption of CCA end interactions with the large ribosomal subunit can promote aberrant codon-anticodon interactions on the small ribosomal subunit.
  • The CCA end plays a critical role in maintaining translational fidelity beyond its role in aminoacylation.