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A Conserved Ribosomal Protein Has Entirely Dissimilar Structures in Different Organisms.

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Ribosomes gain new proteins through evolution. A microsporidia protein, msL1/msL2, evolved a new structure within the ribosome, demonstrating how proteins adapt to complex molecular assemblies.

Keywords:
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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Ribosomes vary in protein composition across species.
  • The evolutionary acquisition of new ribosomal proteins is poorly understood.

Purpose of the Study:

  • To investigate the evolution of the ribosomal protein msL1/msL2 in microsporidia.
  • To understand the mechanism of new protein integration into ribosomes.

Main Methods:

  • Comparative structural analysis of msL1/msL2 across species.
  • Investigating changes in the ribosomal binding site, including rRNA variations.

Main Results:

  • msL1/msL2 exhibits conserved location but divergent structures (secondary, tertiary) and orientation across species.
  • Fold switching of msL1/msL2 is linked to alterations in its ribosomal binding site, specifically rRNA variations.
  • An evolutionary model suggests initial capture of an unfolded protein by rRNA, followed by fold switching.

Conclusions:

  • Proteins can switch folds within complex biological assemblies while maintaining specificity.
  • This study provides insights into the origin and evolution of novel protein components in molecular machines.
  • Findings aid in understanding protein evolution, homolog identification, and biological molecule engineering.