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Related Experiment Videos

Context specific misreading of phenylalanine codons.

J Precup1, A K Ulrich, O Roopnarine

  • 1Department of Microbiology, Southern Illinois University, Carbondale 62901.

Molecular & General Genetics : MGG
|September 1, 1989
PubMed
Summary
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See all related articles

During phenylalanine starvation, the Escherichia coli argI gene shows high mistranslation at position 8, regardless of the specific phenylalanine codon (UUU or UUC). Context, not the codon itself, influences misreading rates.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Phenylalanine starvation can induce codon misreading in bacteria.
  • The Escherichia coli argI gene product, ornithine transcarbamylase, exhibits context-dependent misreading at specific positions.

Purpose of the Study:

  • To investigate the role of specific phenylalanine codons (UUU vs. UUC) in misreading at residue 8 of E. coli ornithine transcarbamylase.
  • To determine if codon context or the specific codon sequence dictates misreading frequency during phenylalanine starvation.

Main Methods:

  • Site-specific mutagenesis was used to alter phenylalanine codons at positions 3 and 8 of the argI gene.
  • Mutant argI genes were expressed, and the resulting ornithine transcarbamylase products were analyzed for mistranslation and activity.

Related Experiment Videos

Main Results:

  • Mistranslation at position 8 occurred at high frequencies with both UUU and UUC codons during phenylalanine starvation.
  • No leucine substitution was observed at position 3, irrespective of whether the codon was UUU or UUC.
  • A mutant with a leucine codon at position 3 produced a stable and active enzyme, ruling out preferential protein turnover as a factor.

Conclusions:

  • The context surrounding a codon, rather than the specific phenylalanine codon (UUU or UUC), is the primary determinant of misreading frequency.
  • Codon context plays a critical role in translational fidelity, particularly under nutrient stress conditions like amino acid starvation.