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Title60S ribosome biogenesis requires rotation of the 5S ribonucleoprotein particle.
Journal, issue, pagesNat Commun, Vol. 5, Page 3491, Year 2014
Publish dateMar 24, 2014
AuthorsChristoph Leidig / Matthias Thoms / Iris Holdermann / Bettina Bradatsch / Otto Berninghausen / Gert Bange / Irmgard Sinning / Ed Hurt / Roland Beckmann /
PubMed AbstractDuring eukaryotic ribosome biogenesis, nascent ribosomal RNA (rRNA) forms pre-ribosomal particles containing ribosomal proteins and assembly factors. Subsequently, these immature rRNAs are processed ...During eukaryotic ribosome biogenesis, nascent ribosomal RNA (rRNA) forms pre-ribosomal particles containing ribosomal proteins and assembly factors. Subsequently, these immature rRNAs are processed and remodelled. Little is known about the premature assembly states of rRNAs and their structural rearrangement during ribosome biogenesis. Using cryo-EM we characterize a pre-60S particle, where the 5S rRNA and its associated ribosomal proteins L18 and L5 (5S ribonucleoprotein (RNP)) are rotated by almost 180° when compared with the mature subunit. Consequently, neighbouring 25S rRNA helices that protrude from the base of the central protuberance are deformed. This altered topology is stabilized by nearby assembly factors (Rsa4 and Nog1), which were identified by fitting their three-dimensional structures into the cryo-EM density. We suggest that the 5S RNP performs a semicircular movement during 60S biogenesis to adopt its final position, fulfilling a chaperone-like function in guiding the flanking 25S rRNA helices of the central protuberance to their final topology.
External linksNat Commun / PubMed:24662372
MethodsEM (single particle) / X-ray diffraction
Resolution1.8 - 8.7 Å
Structure data

2528

4v7f

EMDB-2528: Arx1 pre-60S particle
PDB-4v7f: Arx1 pre-60S particle.
Method: EM (single particle) / Resolution: 8.7 Å

PDB-4nwb:
Crystal structure of Mrt4
Method: X-RAY DIFFRACTION / Resolution: 1.8 Å

Chemicals

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-HOH:
WATER / Water

Source
  • saccharomyces cerevisiae (brewer's yeast)
  • chaetomium thermophilum (fungus)
KeywordsUNKNOWN FUNCTION / ribosome assembly / nucleus / RIBOSOME / 60S biogenesis / 5S rRNA

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