A Time-Resolved Cryo-EM Study of Saccharomyces cerevisiae 80S Ribosome Protein Composition in Response to a Change in Carbon Source

Ming Sun, Bingxin Shen, Wen Li, Parimal Samir, Christopher M. Browne, Andrew J. Link, Joachim Frank

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The role of the ribosome in the regulation of gene expression has come into increased focus. It is proposed that ribosomes are catalytic engines capable of changing their protein composition in response to environmental stimuli. Time-resolved cryo-electron microscopy (cryo-EM) techniques are employed to identify quantitative changes in the protein composition and structure of the Saccharomyces cerevisiae 80S ribosomes after shifting the carbon source from glucose to glycerol. Using cryo-EM combined with the computational classification approach, it is found that a fraction of the yeast cells’ 80S ribosomes lack ribosomal proteins at the entrance and exit sites for tRNAs, including uL16(RPL10), eS1(RPS1), uS11(RPS14A/B), and eS26(RPS26A/B). This fraction increased after a change from glucose to glycerol medium. The quantitative structural analysis supports the hypothesis that ribosomes are dynamic complexes that alter their composition in response to changes in growth or environmental conditions.

Original languageEnglish (US)
Article number2000125
JournalProteomics
Volume21
Issue number2
DOIs
StatePublished - Jan 2021
Externally publishedYes

Keywords

  • cryo-electron microscopy
  • eS1 (RPS1)
  • image classification
  • nutrient stress
  • ribosome
  • time-resolved methods
  • uL16 (RPL10)

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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