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Good Vibrations: Structural Remodeling of Maturing Yeast Pre-40S Ribosomal Particles Followed by Cryo-Electron
Ramtin Shayan1, Dana Rinaldi1, Natacha Larburu1
1Laboratoire de Biologie Moléculaire Eucaryote, Centre de Biologie Intégrative, Université de Toulouse, CNRS, UPS, 118 route de Narbonne, 31062 Toulouse CEDEX, France.
Molecules (Basel, Switzerland)
|March 7, 2020
Summary
Researchers used cryo-electron microscopy (cryo-EM) and proteomics to study yeast small ribosomal subunit (40S) maturation. They discovered a "vibrating" stage crucial for final rRNA maturation and protein integration.
Area of Science:
- Molecular Biology
- Cell Biology
- Structural Biology
Background:
- Ribosome biogenesis is essential for protein synthesis in eukaryotes.
- Cryo-electron microscopy (cryo-EM) has advanced the study of ribosome assembly.
- Final maturation steps of the small (40S) ribosomal subunit remain poorly understood.
Purpose of the Study:
- To investigate the late maturation stages of the yeast 40S ribosomal subunit.
- To characterize pre-40S particles involving the Tsr1 factor.
- To refine the understanding of ribosome biogenesis dynamics.
Main Methods:
- Proteomics analysis of yeast pre-40S particles.
- Cryo-electron microscopy (cryo-EM) and single particle analysis.
- Integration of structural and proteomic data.
Main Results:
- Refined the timing of early pre-40S particle maturation steps.
- Identified a dynamic "vibrating" or "wriggling" stage in pre-40S particle domains.
- Proposed this dynamic stage facilitates final 18S rRNA maturation and late protein incorporation.
Conclusions:
- The study provides new insights into the final maturation events of the 40S ribosomal subunit.
- The dynamic "vibrating" stage is a key intermediate in ribosome biogenesis.
- This work bridges a knowledge gap in understanding eukaryotic ribosome assembly.
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