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TitleChemical and structural characterization of a model Post-Termination Complex (PoTC) for the ribosome recycling reaction: Evidence for the release of the mRNA by RRF and EF-G.
Journal, issue, pagesPLoS One, Vol. 12, Issue 5, Page e0177972, Year 2017
Publish dateMay 24, 2017
AuthorsNobuhiro Iwakura / Takeshi Yokoyama / Fabio Quaglia / Kaoru Mitsuoka / Kazuhiro Mio / Hideki Shigematsu / Mikako Shirouzu / Akira Kaji / Hideko Kaji /
PubMed AbstractA model Post-Termination Complex (PoTC) used for the discovery of Ribosome Recycling Factor (RRF) was purified and characterized by cryo-electron microscopic analysis and biochemical methods. We ...A model Post-Termination Complex (PoTC) used for the discovery of Ribosome Recycling Factor (RRF) was purified and characterized by cryo-electron microscopic analysis and biochemical methods. We established that the model PoTC has mostly one tRNA, at the P/E or P/P position, together with one mRNA. The structural studies were supported by the biochemical measurement of bound tRNA and mRNA. Using this substrate, we establish that the release of tRNA, release of mRNA and splitting of ribosomal subunits occur during the recycling reaction. Order of these events is tRNA release first followed by mRNA release and splitting almost simultaneously. Moreover, we demonstrate that IF3 is not involved in any of the recycling reactions but simply prevents the re-association of split ribosomal subunits. Our finding demonstrates that the important function of RRF includes the release of mRNA, which is often missed by the use of a short ORF with the Shine-Dalgarno sequence near the termination site.
External linksPLoS One / PubMed:28542628 / PubMed Central
MethodsEM (single particle)
Resolution8.5 - 15.6 Å
Structure data

EMDB-9530:
Cryo-EM structure of the model post-termination complex (PoTC) in the rotated state
Method: EM (single particle) / Resolution: 8.5 Å

EMDB-9531:
Cryo-EM structure of the model post-termination complex (PoTC) in the unrotated state
Method: EM (single particle) / Resolution: 9.4 Å

EMDB-9532:
Cryo-EM structure of the model post-termination complex (PoTC) after the ribosome recycling reaction
Method: EM (single particle) / Resolution: 9.2 Å

EMDB-9533:
Cryo-EM structure of the 70S ribosome from polysome
Method: EM (single particle) / Resolution: 15.6 Å

Source
  • Escherichia coli (E. coli)

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