Structural basis for 5'-ETS recognition by Utp4 at the early stages of ribosome biogenesis

Eukaryotic ribosome biogenesis begins with the co-transcriptional assembly of the 90S pre-ribosome. The ‘U three protein’ (UTP) complexes and snoRNP particles arrange around the nascent pre-ribosomal RNA chaperoning its folding and further maturation. The earliest event in this hierarchical process...

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Hauptverfasser: Calviño, Fabiola R. (VerfasserIn) , Kornprobst, Markus (VerfasserIn) , Schermann, Géza (VerfasserIn) , Birkle, Fabienne (VerfasserIn) , Wild, Klemens (VerfasserIn) , Fischer, Tamás (VerfasserIn) , Hurt, Ed (VerfasserIn) , Ahmed, Yasar Luqman (VerfasserIn) , Sinning, Irmgard (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: June 2, 2017
In: PLOS ONE
Year: 2017, Jahrgang: 12, Heft: 6
ISSN:1932-6203
DOI:10.1371/journal.pone.0178752
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1371/journal.pone.0178752
Verlag, kostenfrei, Volltext: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0178752
Volltext
Verfasserangaben:Fabiola R. Calviño, Markus Kornprobst, Géza Schermann, Fabienne Birkle, Klemens Wild, Tamas Fischer, Ed Hurt, Yasar Luqman Ahmed, Irmgard Sinning

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520 |a Eukaryotic ribosome biogenesis begins with the co-transcriptional assembly of the 90S pre-ribosome. The ‘U three protein’ (UTP) complexes and snoRNP particles arrange around the nascent pre-ribosomal RNA chaperoning its folding and further maturation. The earliest event in this hierarchical process is the binding of the UTP-A complex to the 5'-end of the pre-ribosomal RNA (5'-ETS). This oligomeric complex predominantly consists of β-propeller and α-solenoidal proteins. Here we present the structure of the Utp4 subunit from the thermophilic fungus Chaetomium thermophilum at 2.15 Å resolution and analyze its function by UV RNA-crosslinking (CRAC) and in context of a recent cryo-EM structure of the 90S pre-ribosome. Utp4 consists of two orthogonal and highly basic β-propellers that perfectly fit the EM-data. The Utp4 structure highlights an unusual Velcro-closure of its C-terminal β-propeller as relevant for protein integrity and potentially Utp8 recognition in the context of the pre-ribosome. We provide a first model of the 5'-ETS RNA from the internally hidden 5'-end up to the region that hybridizes to the 3'-hinge sequence of U3 snoRNA and validate a specific Utp4/5'-ETS interaction by CRAC analysis. 
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