6Y7C

Early cytoplasmic yeast pre-40S particle (purified with Tsr1 as bait)

Summary for 6Y7C

• Entry DOI: 10.2210/pdb6y7c/pdb
• EMDB information: 10713
• Descriptor: 20S ribosomal RNA, 40S ribosomal protein S9-A, 40S ribosomal protein S11-A, ... (34 entities in total)
• Functional Keywords: yeast pre-ribosomal particle - small ribosomal subunit, ribosome
• Biological source: Saccharomyces cerevisiae (strain ATCC 204508 / S288c); More
• Total number of polymer chains: 34
• Total formula weight: 1328434.62

Authors

Shayan, R.,Plassart, L.,Plisson-Chastang, C. (deposition date: 2020-02-28, release date: 2020-03-18, Last modification date: 2024-05-22)

Primary citation

Shayan, R.,Rinaldi, D.,Larburu, N.,Plassart, L.,Balor, S.,Bouyssie, D.,Lebaron, S.,Marcoux, J.,Gleizes, P.E.,Plisson-Chastang, C.
Good Vibrations: Structural Remodeling of Maturing Yeast Pre-40S Ribosomal Particles Followed by Cryo-Electron Microscopy.
Molecules, 25:-, 2020

PubMed Abstract: 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.

PubMed: 32138239
DOI: 10.3390/molecules25051125

Experimental method

ELECTRON MICROSCOPY (3.8 Å)