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TitleRelease factor-dependent ribosome rescue by BrfA in the Gram-positive bacterium Bacillus subtilis.
Journal, issue, pagesNat Commun, Vol. 10, Issue 1, Page 5397, Year 2019
Publish dateNov 27, 2019
AuthorsNaomi Shimokawa-Chiba / Claudia Müller / Keigo Fujiwara / Bertrand Beckert / Koreaki Ito / Daniel N Wilson / Shinobu Chiba /
PubMed AbstractRescue of the ribosomes from dead-end translation complexes, such as those on truncated (non-stop) mRNA, is essential for the cell. Whereas bacteria use trans-translation for ribosome rescue, some ...Rescue of the ribosomes from dead-end translation complexes, such as those on truncated (non-stop) mRNA, is essential for the cell. Whereas bacteria use trans-translation for ribosome rescue, some Gram-negative species possess alternative and release factor (RF)-dependent rescue factors, which enable an RF to catalyze stop-codon-independent polypeptide release. We now discover that the Gram-positive Bacillus subtilis has an evolutionarily distinct ribosome rescue factor named BrfA. Genetic analysis shows that B. subtilis requires the function of either trans-translation or BrfA for growth, even in the absence of proteotoxic stresses. Biochemical and cryo-electron microscopy (cryo-EM) characterization demonstrates that BrfA binds to non-stop stalled ribosomes, recruits homologous RF2, but not RF1, and induces its transition into an open active conformation. Although BrfA is distinct from E. coli ArfA, they use convergent strategies in terms of mode of action and expression regulation, indicating that many bacteria may have evolved as yet unidentified ribosome rescue systems.
External linksNat Commun / PubMed:31776341 / PubMed Central
MethodsEM (single particle)
Resolution3.06 Å
Structure data

10353

6szs

EMDB-10353, PDB-6szs:
Release factor-dependent ribosome rescue by BrfA in the Gram-positive bacterium Bacillus subtilis
Method: EM (single particle) / Resolution: 3.06 Å

Source
  • escherichia coli k-12 (bacteria)
  • bacillus subtilis (strain 168) (bacteria)
  • escherichia coli (strain k12) (bacteria)
KeywordsRIBOSOME / Cryo-EM / bacterial ribosome rescue / Bacillus ribosome rescue factor A / Bacillus subtilis peptide chain release factor 2

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