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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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Structural basis for stop codon recognition in eukaryotes.

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Summary
This summary is machine-generated.

Eukaryotic release factor 1 (eRF1) recognizes all three stop codons. New cryo-electron microscopy structures reveal how eRF1 uses ribosomal RNA to compact messenger RNA, enabling precise stop codon discrimination.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Protein synthesis termination relies on recognizing stop codons (UAA, UAG, UGA) in the ribosome's A-site.
  • Bacteria use distinct release factors, while eukaryotes employ a single, omnipotent release factor (eRF1).
  • The mechanism by which eRF1 distinguishes stop codons from sense codons remains unclear.

Purpose of the Study:

  • To elucidate the molecular basis of eukaryotic stop codon recognition by eRF1.
  • To determine the structural interactions between eRF1, ribosomes, and stop codons.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to obtain high-resolution structures (3.5-3.8 Å).
  • Mammalian ribosomal complexes bound to eRF1 and each of the three stop codons were analyzed.

Main Results:

  • eRF1 binding induces a conformational change in 18S ribosomal RNA, flipping nucleotide A1825.
  • This nucleotide stacks on the second and third stop codon bases, compacting the messenger RNA.
  • A hydrogen-bonding network between rRNA and eRF1 residues further stabilizes stop codon recognition.

Conclusions:

  • The study provides a molecular framework for how eRF1 achieves eukaryotic stop codon specificity.
  • eRF1 utilizes ribosomal RNA nucleotides, also involved in tRNA selection, to facilitate messenger RNA compaction.
  • Findings offer insights into canonical and premature translation termination mechanisms.