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Disruption of evolutionarily correlated tRNA elements impairs accurate decoding.

Ha An Nguyen1,2, S Sunita1, Christine M Dunham3

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Summary
This summary is machine-generated.

Bacterial transfer RNAs (tRNAs) use anticodon loop base pairs to ensure accurate protein synthesis. Disrupting this pairing mechanism leads to ribosome misreading, impacting translational fidelity.

Keywords:
anticodonmiscodingribosomestructural biologytRNA

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Bacterial transfer RNAs (tRNAs) possess conserved sequences and modifications crucial for ribosomal binding and translational accuracy.
  • A base pair in the tRNA anticodon loop (nucleotides 32 and 38) correlates with the anticodon sequence to fine-tune tRNA binding to the ribosome's decoding center.
  • Disruption of this correlation impairs the ribosome's ability to differentiate correct from incorrect tRNAs, but the molecular basis is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism by which tRNA anticodon loop base pairs and anticodon sequences ensure accurate ribosomal decoding.
  • To investigate the structural consequences of disrupting the correlation between the anticodon loop base pair and the anticodon sequence within the bacterial ribosome.

Main Methods:

  • Determined crystal structures of the bacterial ribosome complexed with wild-type and mutant transfer RNAs (tRNAs).
  • Utilized cryo-electron microscopy (cryo-EM) to visualize the ribosome-tRNA interactions under different codon-anticodon pairing conditions (cognate and near-cognate).
  • Analyzed structural changes in 23S ribosomal RNA (rRNA) nucleotide A1913 and the 32-38 base pair in response to tRNA binding.

Main Results:

  • Wild-type tRNA structures revealed positional changes in 23S rRNA nucleotide A1913 that depend on codon-anticodon recognition.
  • The 32-38 base pair in wild-type tRNA is destabilized when interacting with a near-cognate codon.
  • A mutant tRNA with a reversed 32-38 pair showed abolished A1913 movement, irrespective of codon-anticodon pairing, indicating a loss of discrimination.

Conclusions:

  • The correlation between tRNA anticodon loop base pairs and anticodon sequences is essential for accurate ribosomal decoding.
  • Disruption of this correlation alters tRNA-ribosome interactions, specifically affecting A1913 positioning and the stability of the 32-38 pair.
  • These structural alterations directly contribute to ribosomal misreading and reduced translational fidelity.