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TitleArchitecture of the 90S Pre-ribosome: A Structural View on the Birth of the Eukaryotic Ribosome.
Journal, issue, pagesCell, Vol. 166, Issue 2, Page 380-393, Year 2016
Publish dateJul 14, 2016
AuthorsMarkus Kornprobst / Martin Turk / Nikola Kellner / Jingdong Cheng / Dirk Flemming / Isabelle Koš-Braun / Martin Koš / Matthias Thoms / Otto Berninghausen / Roland Beckmann / Ed Hurt /
PubMed AbstractThe 90S pre-ribosome is an early biogenesis intermediate formed during co-transcriptional ribosome formation, composed of ∼70 assembly factors and several small nucleolar RNAs (snoRNAs) that ...The 90S pre-ribosome is an early biogenesis intermediate formed during co-transcriptional ribosome formation, composed of ∼70 assembly factors and several small nucleolar RNAs (snoRNAs) that associate with nascent pre-rRNA. We report the cryo-EM structure of the Chaetomium thermophilum 90S pre-ribosome, revealing how a network of biogenesis factors including 19 β-propellers and large α-solenoid proteins engulfs the pre-rRNA. Within the 90S pre-ribosome, we identify the UTP-A, UTP-B, Mpp10-Imp3-Imp4, Bms1-Rcl1, and U3 snoRNP modules, which are organized around 5'-ETS and partially folded 18S rRNA. The U3 snoRNP is strategically positioned at the center of the 90S particle to perform its multiple tasks during pre-rRNA folding and processing. The architecture of the elusive 90S pre-ribosome gives unprecedented structural insight into the early steps of pre-rRNA maturation. Nascent rRNA that is co-transcriptionally folded and given a particular shape by encapsulation within a dedicated mold-like structure is reminiscent of how polypeptides use chaperone chambers for their protein folding.
External linksCell / PubMed:27419870
MethodsEM (single particle)
Resolution7.3 Å
Structure data

8143

5jpq

EMDB-8143: nuclear ribo-nucleoprotein complex
PDB-5jpq: Cryo-EM structure of the 90S pre-ribosome
Method: EM (single particle) / Resolution: 7.3 Å

Source
  • chaetomium thermophilum (fungus)
  • saccharomyces cerevisiae (strain atcc 204508 / s288c) (yeast)
KeywordsRIBOSOME / nuclear RNP

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