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Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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Proline codon pair selection determines ribosome pausing strength and translation efficiency in bacteria.

Ralph Krafczyk1, Fei Qi2,3, Alina Sieber1

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Codon choice significantly impacts mRNA translation speed, especially for proline. Specific proline codons like CCG enhance translation, while others like CCC/U-C cause ribosomal frameshifting, influencing protein levels.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • mRNA translation speed is influenced by amino acid incorporation, with proline and adjacent prolines causing significant ribosome stalling.
  • Previous research focused on amino acid context, but the role of mRNA and codon usage in proline-induced stalling was less understood.

Purpose of the Study:

  • To investigate the impact of mRNA codon choice and tRNA availability on ribosome pausing at proline-rich sequences.
  • To explain genome-scale observations of proline codon usage in Escherichia coli.

Main Methods:

  • Bioinformatic analysis of the Escherichia coli genome to identify codon usage patterns for proline.
  • Development and utilization of a luminescence reporter system in living cells to measure ribosome pausing.
  • Dissection of the roles of specific codon choices and cognate tRNA levels in regulating translation efficiency and pausing.

Main Results:

  • Significant differences in codon usage were observed between single and consecutive proline codons in the E. coli genome.
  • The CCC/U-C codon sequon was found to strongly select against due to ribosomal frameshifting.
  • The CCG codon is overrepresented, translated fastest, and associated with near-saturating prolyl-tRNA levels, indicating selection for translation efficiency.
  • The CCA codon, with limiting prolyl-tRNA, is utilized to fine-tune ribosome pausing strength.

Conclusions:

  • Codon selection, particularly for proline pairs, is a critical mechanism for tuning protein expression levels.
  • Evolutionary pressures favor efficient translation through specific codon choices, while others are selected against due to detrimental effects like frameshifting.
  • Ribosome pausing and translation efficiency are dynamically regulated by the interplay of codon usage and tRNA availability.