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Evolution of Translational Machinery in Fast- and Slow-Growing Bacteria.

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Summary

Bacterial genomes are optimized for translation based on growth strategy. Rapidly growing bacteria invest more in translation machinery, like ribosomal RNA (rrn) operons and transfer RNA (tRNA) genes, than slow-growing species.

Keywords:
Borrelia burgdorferiClostridium perfringensMycobacterium tuberculosisVibrio natriegensdoubling timerrn operonstRNAtranslation efficiency

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Bacterial growth rates vary significantly, impacting ecological strategies and physiological limits.
  • Protein synthesis is a key factor in cellular replication and bacterial growth.

Purpose of the Study:

  • To investigate the relationship between genomic investment in translation machinery and bacterial doubling times.
  • To analyze ribosomal RNA (rrn) operon number, total tRNA gene number, and tRNA gene allocation across diverse bacterial species.

Main Methods:

  • Comparative genomics analysis of 20 bacterial species from Bacillati and Pseudomonadati kingdoms.
  • Quantification of rrn operon copy number and tRNA gene counts.
  • Analysis of tRNA gene allocation patterns based on amino acid usage and codon family size.

Main Results:

  • A strong negative correlation exists between bacterial generation time and both rrn operon number and tRNA gene number.
  • This pattern holds true independently within both major bacterial kingdoms studied.
  • tRNA gene allocation is non-uniform, with frequently used amino acids and larger codon families having disproportionately more tRNA genes.
  • A model incorporating amino acid usage and codon family size accurately describes tRNA gene allocation, particularly in fast-growing bacteria like *Vibrio natriegens*.

Conclusions:

  • Bacterial genomes are systematically optimized for translation, with the capacity and structure of the translation machinery tightly coupled to the organism's growth strategy.
  • Natural selection fine-tunes the translation system to match the replicative demands of different bacterial species.
  • Slow-growing bacteria possess minimalist translation systems compared to their rapidly growing counterparts.