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TitleGood Vibrations: Structural Remodeling of Maturing Yeast Pre-40S Ribosomal Particles Followed by Cryo-Electron Microscopy.
Journal, issue, pagesMolecules, Vol. 25, Issue 5, Year 2020
Publish dateMar 3, 2020
AuthorsRamtin Shayan / Dana Rinaldi / Natacha Larburu / Laura Plassart / Stéphanie Balor / David Bouyssié / Simon Lebaron / Julien Marcoux / Pierre-Emmanuel Gleizes / Célia Plisson-Chastang /
PubMed AbstractAssembly of eukaryotic ribosomal subunits is a very complex and sequential process that starts in the nucleolus and finishes in the cytoplasm with the formation of functional ribosomes. Over the past ...Assembly of eukaryotic ribosomal subunits is a very complex and sequential process that starts in the nucleolus and finishes in the cytoplasm with the formation of functional ribosomes. Over the past few years, characterization of the many molecular events underlying eukaryotic ribosome biogenesis has been drastically improved by the "resolution revolution" of cryo-electron microscopy (cryo-EM). However, if very early maturation events have been well characterized for both yeast ribosomal subunits, little is known regarding the final maturation steps occurring to the small (40S) ribosomal subunit. To try to bridge this gap, we have used proteomics together with cryo-EM and single particle analysis to characterize yeast pre-40S particles containing the ribosome biogenesis factor Tsr1. Our analyses lead us to refine the timing of the early pre-40S particle maturation steps. Furthermore, we suggest that after an early and structurally stable stage, the beak and platform domains of pre-40S particles enter a "vibrating" or "wriggling" stage, that might be involved in the final maturation of 18S rRNA as well as the fitting of late ribosomal proteins into their mature position.
External linksMolecules / PubMed:32138239 / PubMed Central
MethodsEM (single particle)
Resolution3.1 - 9.1 Å
Structure data

10713

6y7c

EMDB-10713, PDB-6y7c:
Early cytoplasmic yeast pre-40S particle (purified with Tsr1 as bait)
Method: EM (single particle) / Resolution: 3.8 Å

EMDB-10715:
Yeast Tsr1-FPZ pre-40S particle - consensus structure
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-10716:
head domain of Tsr1-FPZ pre-40S particle: structural class 1 (H1)
Method: EM (single particle) / Resolution: 3.84 Å

EMDB-10717:
head domain of Tsr1-FPZ pre-40S particle: structural class 2 (H2)
Method: EM (single particle) / Resolution: 6.4 Å

EMDB-10718:
Platform domain of Tsr1-FPZ pre-40S particle: structural class 1 (P1)
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-10719:
Platform domain of Tsr1-FPZ pre-40S particle: structural class 2 (P2)
Method: EM (single particle) / Resolution: 9.1 Å

Source
  • saccharomyces cerevisiae (strain atcc 204508 / s288c) (yeast)
  • Saccharomyces cerevisiae S288C (yeast)
KeywordsRIBOSOME / yeast pre-ribosomal particle - small ribosomal subunit

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