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Evolutionary Convergence of Pathway-Specific Enzyme Expression Stoichiometry.

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Biological pathways require precise protein amounts, even when gene regulation evolves differently. This study reveals conserved protein stoichiometry across diverse bacteria and yeast, highlighting a fundamental principle for pathway construction.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Systems Biology

Background:

  • Gene regulation traditionally assumes coexpressed proteins are regulated similarly.
  • The necessity of precise protein stoichiometry for co-regulated pathways remains largely unexplored.
  • Understanding protein abundance tuning is crucial for comprehending biological pathway assembly.

Purpose of the Study:

  • To investigate protein stoichiometry and regulatory strategies in bacterial pathways across vast evolutionary timescales.
  • To determine if conserved protein ratios are maintained despite divergent gene architectures.
  • To explore convergent evolution of pathway expression in eukaryotes.

Main Methods:

  • Large-scale analysis of protein stoichiometry and operon structures in divergent bacteria (0.6-2 billion years).
  • Utilized end-enriched RNA-sequencing (Rend-seq) for single-nucleotide resolution transcript abundance.
  • Comparative analysis of bacterial pathways and functionally analogous pathways in yeast.

Main Results:

  • Significant divergence in transcript abundance and gene cluster architectures observed in conserved bacterial pathways.
  • Post-transcriptional mechanisms compensate for regulatory divergence, maintaining preferred protein synthesis rates.
  • Independent evolutionary pathways in yeast converged on similar in-pathway expression patterns.

Conclusions:

  • Exact protein stoichiometries are broadly required for biological pathways, irrespective of regulatory strategy.
  • This finding presents a fundamental principle for constructing biological pathways, applicable to both natural systems and synthetic biology.
  • Evolution favors mechanisms that ensure precise protein ratios for pathway function.