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TitleA general mechanism of ribosome dimerization revealed by single-particle cryo-electron microscopy.
Journal, issue, pagesNat Commun, Vol. 8, Issue 1, Page 722, Year 2017
Publish dateSep 28, 2017
AuthorsLinda E Franken / Gert T Oostergetel / Tjaard Pijning / Pranav Puri / Valentina Arkhipova / Egbert J Boekema / Bert Poolman / Albert Guskov /
PubMed AbstractBacteria downregulate their ribosomal activity through dimerization of 70S ribosomes, yielding inactive 100S complexes. In Escherichia coli, dimerization is mediated by the hibernation promotion ...Bacteria downregulate their ribosomal activity through dimerization of 70S ribosomes, yielding inactive 100S complexes. In Escherichia coli, dimerization is mediated by the hibernation promotion factor (HPF) and ribosome modulation factor. Here we report the cryo-electron microscopy study on 100S ribosomes from Lactococcus lactis and a dimerization mechanism involving a single protein: HPF. The N-terminal domain of HPF binds at the same site as HPF in Escherichia coli 100S ribosomes. Contrary to ribosome modulation factor, the C-terminal domain of HPF binds exactly at the dimer interface. Furthermore, ribosomes from Lactococcus lactis do not undergo conformational changes in the 30S head domains upon binding of HPF, and the Shine-Dalgarno sequence and mRNA entrance tunnel remain accessible. Ribosome activity is blocked by HPF due to the inhibition of mRNA recognition by the platform binding center. Phylogenetic analysis of HPF proteins suggests that HPF-mediated dimerization is a widespread mechanism of ribosome hibernation in bacteria.When bacteria enter the stationary growth phase, protein translation is suppressed via the dimerization of 70S ribosomes into inactive complexes. Here the authors provide a structural basis for how the dual domain hibernation promotion factor promotes ribosome dimerization and hibernation in bacteria.
External linksNat Commun / PubMed:28959045 / PubMed Central
MethodsEM (single particle)
Resolution5.6 Å
Structure data

3581

5myj

EMDB-3581, PDB-5myj:
Structure of 70S ribosome from Lactococcus lactis
Method: EM (single particle) / Resolution: 5.6 Å

Source
  • Lactococcus lactis (lactic acid bacteria)
  • lactococcus lactis subsp. cremoris mg1363 (lactic acid bacteria)
  • lactococcus lactis subsp. cremoris (strain mg1363) (lactic acid bacteria)
KeywordsRIBOSOME / 70S / lactoccocus lactis / Cryo-EM

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